Lines Matching +full:multi +full:- +full:socket
5 force -- enable ACPI if default was off
6 on -- enable ACPI but allow fallback to DT [arm64]
7 off -- disable ACPI if default was on
8 noirq -- do not use ACPI for IRQ routing
9 strict -- Be less tolerant of platforms that are not
11 rsdt -- prefer RSDT over (default) XSDT
12 copy_dsdt -- copy DSDT to memory
26 If set to vendor, prefer vendor-specific driver
58 Documentation/firmware-guide/acpi/debug.rst for more information about
121 Disable auto-serialization of AML methods
124 auto-serialization feature.
142 Ignore the ACPI-based watchdog interface (WDAT) and let
163 acpi_osi=! # disable all built-in OS vendor
165 acpi_osi=!! # enable all built-in OS vendor
227 For broken nForce2 BIOS resulting in XT-PIC timer.
235 as soon as the kernel's real-mode entry point is called.
265 See Documentation/sound/alsa-configuration.rst
272 align_va_addr= [X86-64]
277 CPU-intensive style benchmark, and it can vary highly in
280 32: only for 32-bit processes
281 64: only for 64-bit processes
282 on: enable for both 32- and 64-bit processes
283 off: disable for both 32- and 64-bit processes
299 Allow execve() of 32-bit applications and setting of the
301 subset of the CPUs support 32-bit EL0. When this
302 parameter is present, the set of CPUs supporting 32-bit
304 and hot-unplug operations may be restricted.
306 amd_iommu= [HW,X86-64]
309 fullflush - enable flushing of IO/TLB entries when
313 off - do not initialize any AMD IOMMU found in
315 force_isolation - Force device isolation for all
321 amd_iommu_dump= [HW,X86-64]
327 amd_iommu_intr= [HW,X86-64]
330 legacy - Use legacy interrupt remapping mode.
331 vapic - Use virtual APIC mode, which allows IOMMU
333 This mode requires kvm-amd.avic=1.
347 Power management functions (SPARCstation-4/5 + deriv.)
349 Disable APC CPU standby support. SPARCstation-Fox does
350 not play well with APC CPU idle - disable it if you have
357 when initialising the APIC and IO-APIC components.
358 For X86-32, this can also be used to specify an APIC
378 to set it to "all" by meaning -- no limit here.
387 arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
420 audit= [KNL] Enable the audit sub-system
422 0 | off - kernel audit is disabled and can not be
424 unset - kernel audit is initialized but disabled and
426 1 | on - kernel audit is initialized and partially
439 0 - Disable the BAU.
440 1 - Enable the BAU.
441 unset - Disable the BAU.
462 See Documentation/block/cmdline-partition.rst
473 See Documentation/admin-guide/bootconfig.rst
484 bttv.pll= See Documentation/admin-guide/media/bttv.rst
493 cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection.
512 inclusive. See arch/mips/include/asm/pgtable-bits.h
522 - foo isn't auto-mounted if you mount all cgroups in
524 - foo isn't visible as an individually mountable
526 - if foo is an optional feature then the feature is
532 Specifying "pressure" disables per-cgroup pressure
546 nosocket -- Disable socket memory accounting.
547 nokmem -- Disable kernel memory accounting.
552 0 -- check protection applied by kernel (includes
554 1 -- check protection requested by application.
568 force such clocks to be always-on nor does it reserve
572 information, see Documentation/driver-api/clk.rst.
574 clock= [BUGS=X86-32, HW] gettimeofday clocksource override.
591 [X86-32] pit,hpet,tsc;
598 [X86-64] hpet,tsc
604 architected timer so that code using WFE-based polling
627 cma=nn[MG]@[start[MG][-end[MG]]]
638 Sets the size of kernel per-numa memory area for
640 per-numa CMA altogether. And If this option is not
642 With per-numa CMA enabled, DMA users on node nid will
658 com20020= [HW,NET] ARCnet - COM20020 chipset
662 com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
666 ARCnet - COM90xx chipset (memory-mapped buffers)
684 See Documentation/admin-guide/serial-console.rst for more
694 Start an early, polled-mode console on the 8250/16550
697 MMIO inter-register address stride is either 8-bit
698 (mmio), 16-bit (mmio16), or 32-bit (mmio32).
702 the h/w is not re-initialized.
723 syscall, or to executing "dmesg -S --raw" or to reading
743 disable the cpuidle sub-system
749 disable the cpufreq sub-system
757 [X86] Delay for N microsec between assert and de-assert
772 [KNL, X86-64] Select a region under 4G first, and
775 See Documentation/admin-guide/kdump/kdump.rst for further details.
780 start-[end] where start and end are both
782 Documentation/admin-guide/kdump/kdump.rst for an example.
785 [KNL, X86-64] range could be above 4G. Allow kernel
792 [KNL, X86-64] range under 4G. When crashkernel=X,high
797 low memory is needed to make sure DMA buffers for 32-bit
807 [KNL] Disable crypto self-tests
821 See also Documentation/input/devices/joystick-parport.rst
825 Documentation/admin-guide/dynamic-debug-howto.rst for
839 [KNL] verbose self-tests
842 self-tests.
844 1 will print _a lot_ more information - normally
882 Format: { on, no-mount, off }
884 no-mount:
889 get a -EPERM as result when trying to register files
893 Default value is set in build-time with a kernel configuration.
905 Documentation/admin-guide/mm/hugetlbpage.rst.
956 against bounds-checking flaws in the kernel's
1016 entries for DMA-API debugging code. One entry is
1017 required per DMA-API allocation. Use this if the
1018 DMA-API debugging code disables itself because the
1022 With this option the DMA-API debugging driver
1037 Generic built-in EDID data sets are used, if one of
1042 available in Documentation/admin-guide/edid.rst. An EDID
1054 Control how the dt_cpu_ftrs device-tree binding is
1064 what data is available or for reverse-engineering.
1069 Documentation/admin-guide/dynamic-debug-howto.rst
1086 determined by stdout-path property in device tree's
1091 Start an early, polled-mode console on a Cadence
1102 Start an early, polled-mode console on the 8250/16550
1104 MMIO inter-register address stride is either 8-bit
1105 (mmio) or 32-bit (mmio32 or mmio32be).
1113 Start an early, polled-mode console on a pl011 serial
1117 the driver will use only 32-bit accessors to read/write
1121 Start an early, polled-mode console on a meson serial
1127 Start an early, polled-mode console on an msm serial
1133 Start an early, polled-mode console on an msm serial
1139 Start an early, polled-mode console on a serial port
1145 Start an early, polled-mode console on a serial port
1151 Use RISC-V SBI (Supervisor Binary Interface) for early
1169 Start an early, polled-mode console on a lantiq serial
1183 Start an early, polled-mode, output-only console on the
1188 Start an early, polled-mode console on the
1194 Start an early, polled-mode console on a Qualcomm
1202 coherent non-x86 systems that use system memory for
1313 attribute is added to range 0x100000000-0x180000000 and
1314 0x10a0000000-0x1120000000.
1318 range 0x240000000-0x43fffffff.
1330 Documentation/admin-guide/acpi/ssdt-overlays.rst for details.
1336 elanfreq= [X86-32]
1344 See Documentation/admin-guide/kdump/kdump.rst for details.
1360 0 -- permissive (log only, no denials).
1361 1 -- enforcing (deny and log).
1385 See also Documentation/fault-injection/.
1389 See Documentation/admin-guide/sysctl/net.rst for
1393 See Documentation/admin-guide/blockdev/floppy.rst.
1396 [IA-64] Avoid check_sal_cache_flush which may hang on
1401 forcepae [X86-32]
1420 ftrace_filter=[function-list]
1422 tracer at boot up. function-list is a comma separated
1427 ftrace_notrace=[function-list]
1429 function-list. This list can be changed at run time
1433 ftrace_graph_filter=[function-list]
1436 function-list is a comma separated list of functions
1440 ftrace_graph_notrace=[function-list]
1442 function-list. This list is a comma separated list of
1462 off -- Don't create device links from firmware info.
1463 permissive -- Create device links from firmware info
1466 on -- Create device links from firmware info and use it
1468 rpm -- Like "on", but also use to order runtime PM.
1479 See also Documentation/input/devices/joystick-parport.rst
1483 gart_fix_e820= [X86-64] disable the fix e820 for K8 GART
1507 gcov_persist= [GCOV] When non-zero (default), profiling data for
1540 gpio-mockup.gpio_mockup_ranges
1545 [KNL] Should the hard-lockup detector generate
1551 for 64-bit NUMA, off otherwise.
1554 hcl= [IA-64] SGI's Hardware Graph compatibility layer
1561 corresponding firmware-first mode error processing
1575 hpet= [X86-32,HPET] option to control HPET usage
1592 boot-time allocation of gigantic hugepages is skipped.
1600 Documentation/admin-guide/mm/hugetlbpage.rst.
1610 Documentation/admin-guide/mm/hugetlbpage.rst.
1619 by the CONFIG_BOOTPARAM_HUNG_TASK_PANIC build-time
1625 hvc_iucv_allow= [S390] Comma-separated list of z/VM user IDs.
1652 (disabled by default, and as a pre-condition
1654 i8042.direct [HW] Put keyboard port into non-translated mode
1668 suspend-to-ram transitions, only during s2r
1703 -1 -- never invert brightness
1704 0 -- machine default
1705 1 -- force brightness inversion
1710 ide-core.nodma= [HW] (E)IDE subsystem
1716 ide-generic.probe-mask= [HW] (E)IDE subsystem
1728 ide-pci-generic.all-generic-ide [HW] (E)IDE subsystem
1739 idle=nomwait: Disable mwait for CPU C-states
1756 legacy only accept legacy-NaN binaries, if supported
1758 2008 only accept 2008-NaN binaries, if supported
1767 'relaxed' straps the emulator for both legacy-NaN and
1768 2008-NaN, whereas 'strict' enables legacy-NaN only on
1777 Ignore loglevel setting - this will print /all/
1841 Formats: { "ima" | "ima-ng" | "ima-sig" }
1842 Default: "ima-ng"
1874 initcall_blacklist= [KNL] Do not execute a comma-separated list of
1875 initcall functions. Useful for debugging built-in
1908 0 -- basic integrity auditing messages. (Default)
1909 1 -- additional integrity auditing messages.
1922 forcedac [X86-64]
1924 for io virtual address below 32-bit forcing dual
1926 than 32-bit addressing. The default is to look
1927 for translation below 32-bit and if not available
1945 could harm performance of some high-throughput
1959 1 to 9 specify maximum depth of C-state.
1969 used along with the hardware-managed P-states (HWP)
1973 in favor of acpi-cpufreq. Forcing the intel_pstate driver
1974 instead of acpi-cpufreq may disable platform features, such
1976 P-States information being indicated to OSPM and therefore
1979 or on platforms that use pcc-cpufreq instead of acpi-cpufreq.
1992 Allow per-logical-CPU P-State performance control limits using
1995 intremap= [X86-64, Intel-IOMMU]
2000 BIOS x2APIC opt-out request will be ignored
2024 0 - Lazy mode.
2030 1 - Strict mode (default).
2037 0 - Use IOMMU translation for DMA.
2038 1 - Bypass the IOMMU for DMA.
2039 unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH.
2041 io7= [HW] IO7 for Marvel-based Alpha systems
2056 See Documentation/admin-guide/nfs/nfsroot.rst.
2080 Enables support for pseudo-NMIs in the kernel. This
2099 [Deprecated - use cpusets instead]
2100 Format: [flag-list,]<cpu-list>
2131 "number of CPUs in system - 1".
2157 The format of <cpu-list> is described above.
2161 ivrs_ioapic [HW,X86-64]
2162 Provide an override to the IOAPIC-ID<->DEVICE-ID
2166 For example, to map IOAPIC-ID decimal 10 to
2172 * To map IOAPIC-ID decimal 10 to PCI device 00:14.0
2175 * To map IOAPIC-ID decimal 10 to PCI segment 0x1 and
2179 ivrs_hpet [HW,X86-64]
2180 Provide an override to the HPET-ID<->DEVICE-ID
2184 For example, to map HPET-ID decimal 10 to
2190 * To map HPET-ID decimal 0 to PCI device 00:14.0
2193 * To map HPET-ID decimal 10 to PCI segment 0x1 and
2197 ivrs_acpihid [HW,X86-64]
2198 Provide an override to the ACPI-HID:UID<->DEVICE-ID
2202 For example, to map UART-HID:UID AMD0020:0 to
2208 * To map UART-HID:UID AMD0020:0 to PCI segment is 0,
2211 * To map UART-HID:UID AMD0020:0 to PCI segment 0x1 and
2231 kernelcore= [KNL,X86,IA-64,PPC]
2234 the kernel for non-movable allocations. The requested
2244 subsystem. Note that allocations like PTEs-from-HighMem
2252 for non-movable allocations and remaining memory is used
2263 gdb or control-c on the dbgp connection. When
2264 not using this parameter you use sysrq-g to break into
2269 or a supported polling keyboard driver (non-usb).
2296 Configure the RouterBoard 532 series on-chip
2299 kmemleak= [KNL] Boot-time kmemleak enable/disable
2305 kprobe_event=[probe-list]
2307 The probe-list is a semicolon delimited list of probe
2353 kvm-amd.nested= [KVM,AMD] Allow nested virtualization in KVM/SVM.
2356 kvm-amd.npt= [KVM,AMD] Disable nested paging (virtualized MMU)
2358 Default is 1 (enabled) if in 64-bit or 32-bit PAE mode.
2360 kvm-arm.mode=
2365 nvhe: Standard nVHE-based mode, without support for
2368 protected: nVHE-based mode with support for guests whose
2375 kvm-arm.vgic_v3_group0_trap=
2376 [KVM,ARM] Trap guest accesses to GICv3 group-0
2379 kvm-arm.vgic_v3_group1_trap=
2380 [KVM,ARM] Trap guest accesses to GICv3 group-1
2383 kvm-arm.vgic_v3_common_trap=
2387 kvm-arm.vgic_v4_enable=
2399 kvm-intel.ept= [KVM,Intel] Disable extended page tables
2403 kvm-intel.emulate_invalid_guest_state=
2405 Ignored if kvm-intel.enable_unrestricted_guest=1, as
2411 kvm-intel.flexpriority=
2415 kvm-intel.nested=
2419 kvm-intel.unrestricted_guest=
2424 kvm-intel.vmentry_l1d_flush=[KVM,Intel] Mitigation for L1 Terminal Fault
2425 CVE-2018-3620.
2436 kvm-intel.vpid= [KVM,Intel] Disable Virtual Processor Identification
2503 For details see: Documentation/admin-guide/hw-vuln/l1tf.rst
2509 lapic [X86-32,APIC] Enable the local APIC even if BIOS
2513 value for LAPIC timer one-shot implementation. Default
2548 first fan-out link behind PMP device. It does not
2562 * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7].
2574 hot-unplug link recovery
2589 call memblock_remove on the regions marked with no-map
2617 Set the number of locking read-acquisition kthreads.
2622 Set the number of locking write-acquisition kthreads.
2625 Set time (s) after boot for CPU-hotplug testing.
2628 Set time (s) between CPU-hotplug operations, or
2629 zero to disable CPU-hotplug testing.
2632 Set task-shuffle interval (jiffies). Shuffling
2633 tasks allows some CPUs to go into dyntick-idle
2638 is useful for hands-off automated testing.
2671 7 (KERN_DEBUG) debug-level messages
2681 logo.nologo [FB] Disables display of the built-in Linux logo.
2699 an IEEE 1284-compliant printer is attached; if
2705 time-consuming boot-time autodetection (up to 250 ms per
2726 machvec= [IA-64] Force the use of a particular machine-vector
2732 Example: machtype=lemote-yeeloong-2f-7inch
2747 (loop.max_loop) unconditionally pre-created at init time. The default
2750 devices can be requested on-demand with the
2751 /dev/loop-control interface.
2753 mce [X86-32] Machine Check Exception
2755 mce=option [X86-64] See Documentation/x86/x86_64/boot-options.rst
2758 See Documentation/admin-guide/md.rst.
2765 Control mitigation for the Micro-architectural Data
2780 full - Enable MDS mitigation on vulnerable CPUs
2781 full,nosmt - Enable MDS mitigation and disable
2783 off - Unconditionally disable MDS mitigation
2785 On TAA-affected machines, mds=off can be prevented by
2794 For details see: Documentation/admin-guide/hw-vuln/mds.rst
2813 mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
2818 per-device physically contiguous DMA buffers.
2826 See Documentation/admin-guide/mm/memory-hotplug.rst.
2851 Example: Exclude memory from 0x18690000-0x1869ffff
2865 memmap=<size>%<offset>-<oldtype>+<newtype>
2867 from <oldtype> to <newtype>. If "-<oldtype>" is left
2882 repeatable BIOS-originated corruption always
2907 mem_encrypt= [X86-64] AMD Secure Memory Encryption (SME) control
2915 Refer to Documentation/virt/kvm/amd-memory-encryption.rst
2919 s2idle - Suspend-To-Idle
2920 shallow - Power-On Suspend or equivalent (if supported)
2921 deep - Suspend-To-RAM or equivalent (if supported)
2922 See Documentation/admin-guide/pm/sleep-states.rst.
2925 See Documentation/admin-guide/media/meye.rst.
2927 mfgpt_irq= [IA-32] Specify the IRQ to use for the
2928 Multi-Function General Purpose Timers on AMD Geode
2931 mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when
2945 0 - The attached screen is the 3.5" TFT
2946 1 - The attached screen is the 7" TFT
2947 2 - The VGA Shield is attached (1024x768)
2951 b - Enable backlight. The TFT backlight pin will be
2955 c - Enable the s3c camera interface.
2956 t - Reserved for enabling touchscreen support. The
2960 https://repo.or.cz/w/linux-2.6/mini2440.git
2965 arch-independent options, each of which is an
2966 aggregation of existing arch-specific options.
2987 ssbd=force-off [ARM64]
3000 have other ways of avoiding SMT-based attacks.
3035 full - Enable mitigation on vulnerable CPUs
3037 full,nosmt - Enable mitigation and disable SMT on
3040 off - Unconditionally disable mitigation
3053 Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst
3061 module_blacklist= [KNL] Do not load a comma-separated list of
3075 movablecore= [KNL,X86,IA-64,PPC]
3086 movable_node [KNL] Boot-time switch to make hotplugable memory
3093 Format: <name>,<region-number>,<size>,<offset>
3096 <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
3119 The range of acceptible values are 1-16. Always start with lower
3120 values in the 2-6 range. Higher values should be justified with
3125 onenand.bdry= [HW,MTD] Flex-OneNAND Boundary Configuration
3129 boundary - index of last SLC block on Flex-OneNAND.
3131 lock - Configure if Flex-OneNAND boundary should be locked.
3138 See arch/arm/mach-s3c2412/mach-jive.c
3166 something different and driver-specific.
3177 See Documentation/admin-guide/nfs/nfsroot.rst.
3179 nfsroot= [NFS] nfs root filesystem for disk-less boxes.
3180 See Documentation/admin-guide/nfs/nfsroot.rst.
3183 See Documentation/admin-guide/nfs/nfsroot.rst.
3207 [NFS] enable 64-bit inode numbers.
3208 If zero, the NFS client will fake up a 32-bit inode
3210 of returning the full 64-bit number.
3211 The default is to return 64-bit inode numbers.
3241 [NFS4] Specify an additional fixed unique ident-
3272 driver. A non-zero value sets the minimum interval
3284 NMI stack-backtrace request.
3293 0 - turn hardlockup detector in nmi_watchdog off
3294 1 - turn hardlockup detector in nmi_watchdog on
3311 no387 [BUGS=X86-32] Tells the kernel to use the 387 maths
3315 no5lvl [X86-64] Disable 5-level paging mode. Forces
3316 kernel to use 4-level paging instead.
3347 caches in the slab allocator. Saves per-node memory,
3367 nodelayacct [KNL] Disable per-task delay accounting
3373 no_entry_flush [PPC] Don't flush the L1-D cache when entering the kernel.
3375 noexec [IA-64]
3378 On X86-32 available only on PAE configured kernels.
3379 noexec=on: enable non-executable mappings (default)
3380 noexec=off: disable non-executable mappings
3390 noexec32 [X86-64]
3391 This affects only 32-bit executables.
3392 noexec32=on: enable non-executable mappings (default)
3394 noexec32=off: disable non-executable mappings
3399 nofxsr [BUGS=X86-32] Disables x86 floating point extended
3401 legacy floating-point registers on task switch.
3425 [PPC] Don't flush the L1-D cache after accessing user data.
3429 enabling legacy floating-point and sse state.
3454 nohalt [IA-64] Tells the kernel not to use the power saving
3456 power-consumption. On the positive side, it reduces
3457 interrupt wake-up latency, which may improve performance
3459 real-time systems.
3469 compared. However, if this command-line option is
3493 noirqdebug [X86-32] Disables the code which attempts to detect and
3504 nointremap [X86-64, Intel-IOMMU] Do not enable interrupt
3506 [Deprecated - use intremap=off]
3508 nointroute [IA-64]
3512 nojitter [IA-64] Disables jitter checking for ITC timers.
3514 no-kvmclock [X86,KVM] Disable paravirtualized KVM clock driver
3516 no-kvmapf [X86,KVM] Disable paravirtualized asynchronous page
3519 no-vmw-sched-clock
3523 no-steal-acc [X86,PV_OPS,ARM64] Disable paravirtualized steal time
3527 nolapic [X86-32,APIC] Do not enable or use the local APIC.
3529 nolapic_timer [X86-32,APIC] Do not use the local APIC timer.
3534 nomca [IA-64] Disable machine check abort handling
3536 nomce [X86-32] Disable Machine Check Exception
3538 nomfgpt [X86-32] Disable Multi-Function General Purpose
3550 nopcid [X86-64] Disable the PCID cpu feature.
3555 noreplace-smp [X86-32,SMP] Don't replace SMP instructions
3566 no-scroll [VGA] Disables scrollback.
3567 This is required for the Braillex ib80-piezo Braille
3570 nosbagart [IA-64]
3572 nosep [BUGS=X86-32] Disables x86 SYSENTER/SYSEXIT support.
3577 nosoftlockup [KNL] Disable the soft-lockup detector.
3582 soft-lockup and NMI watchdog (hard-lockup).
3586 nox2apic [X86-64,APIC] Do not enable x2APIC mode.
3611 nptcg= [IA-64] Override max number of concurrent global TLB
3620 n. So during boot up some boot time memory for per-cpu
3621 variables need be pre-allocated for later physical cpu
3632 See Documentation/admin-guide/sysctl/vm.rst for details.
3635 See Documentation/core-api/debugging-via-ohci1394.rst for more
3674 running on a platform with a direct-mapped memory-side
3680 page_owner= [KNL] Boot-time page_owner enabling option.
3686 page_poison= [KNL] Boot-time parameter changing the state of
3716 See Documentation/admin-guide/tainted-kernels.rst for
3723 pelt= [KNL] Boot-time parameter changing the PELT half life in ms
3730 Run kdump after running panic-notifiers and dumping
3775 See also Documentation/admin-guide/blockdev/paride.rst.
3804 bios [X86-32] force use of PCI BIOS, don't access
3806 has a non-standard PCI host bridge.
3807 nobios [X86-32] disallow use of PCI BIOS, only direct
3813 data in IO port 0xCFC, both 32-bit).
3815 Mechanism 2 (IO port 0xCF8 is an 8-bit port for
3816 the function, IO port 0xCFA, also 8-bit, sets
3818 through ports 0xC000-0xCFFF).
3825 root domains (aka PCI segments, in ACPI-speak).
3833 disable the use of MSI interrupts system-wide.
3838 primary IO-APIC for bridges that cannot disable
3845 biosirq [X86-32] Use PCI BIOS calls to get the interrupt
3869 F0000h-100000h range.
3874 assign-busses [X86] Always assign all PCI bus
3902 bfsort Sort PCI devices into breadth-first order.
3905 nobfsort Don't sort PCI devices into breadth-first order.
3907 tuning and use the BIOS-configured MPS defaults.
3917 configuration allows peer-to-peer DMA between
3920 that hot-added devices will work.
3935 A PCI-PCI bridge can be specified if resource
3941 for 4096-byte alignment.
3943 end-to-end CRC checking).
3972 noats [PCIE, Intel-IOMMU, AMD-IOMMU]
4008 dpc-native Use native PCIe service for DPC only. May
4025 Keep all power-domains already enabled by bootloader on,
4031 See Documentation/admin-guide/blockdev/paride.rst.
4046 See Documentation/admin-guide/blockdev/paride.rst.
4049 See Documentation/admin-guide/blockdev/paride.rst.
4051 pirq= [SMP,APIC] Manual mp-table setup
4052 See Documentation/x86/i386/IO-APIC.rst.
4056 See also Documentation/admin-guide/parport.rst.
4067 CONFIG_PNP_DEBUG_MESSAGES option). Change at run-time
4076 { on | off | curr | res | no-curr | no-res }
4114 print-fatal-signals=
4120 coredump - etc.
4123 you might want to try "ulimit -i unlimited".
4135 on - unlimited logging to /dev/kmsg from userspace
4136 off - logging to /dev/kmsg disabled
4137 ratelimit - ratelimit the logging
4144 Limit processor to maximum C-state
4148 Ignore the _CST method to determine C-states,
4155 Param: "schedule" - profile schedule points.
4156 Param: "sleep" - profile D-state sleeping (millisecs).
4158 Param: "kvm" - profile VM exits.
4159 Param: <number> - step/bucket size as a power of 2 for
4189 See Documentation/admin-guide/blockdev/paride.rst.
4191 pti= [X86-64] Control Page Table Isolation of user and
4196 on - unconditionally enable
4197 off - unconditionally disable
4198 auto - kernel detects whether your CPU model is
4203 nopti [X86-64]
4207 [KNL] Number of legacy pty's. Overwrites compiled-in
4215 See Documentation/admin-guide/md.rst.
4218 See Documentation/admin-guide/blockdev/ramdisk.rst.
4234 ras=option[,option,...] [KNL] RAS-specific options
4246 the specified list of CPUs to be no-callback CPUs.
4249 purpose, where "x" is "p" for RCU-preempt, and
4250 "s" for RCU-sched, and "N" is the CPU number.
4252 which can be useful for HPC and real-time
4261 This improves the real-time response for the
4278 RCU grace-period cleanup.
4282 RCU grace-period initialization.
4286 RCU grace-period pre-initialization, that is,
4287 the propagation of recent CPU-hotplug changes up
4292 per-CPU rcuc kthreads. Defaults to a non-zero
4300 cache-to-cache transfer latencies.
4306 and for NUMA systems with large remote-access
4319 Set delay from grace-period initialization to
4332 soliciting quiescent-state help from
4344 Set the SCHED_FIFO priority of the RCU per-CPU
4347 and for the RCU grace-period kthreads (rcu_bh,
4349 set, valid values are 1-99 and the default is 1
4350 (the least-favored priority). Otherwise, when
4351 RCU_BOOST is not set, valid values are 0-99 and
4352 the default is zero (non-realtime operation).
4358 the wakeup overhead on the global grace-period
4360 each group's NOCB grace-period kthread.
4368 batch limiting is re-enabled.
4372 RCU's force-quiescent-state scan will aggressively
4390 Cause the grace-period kthread to get an extra
4392 it should at force-quiescent-state time.
4398 this specifies an rcu_read_unlock()-time delay
4402 of RCU-protected pointers after the relevant
4412 grace-period primitives such as call_rcu().
4423 grace-period primitives.
4426 Set test-start holdoff period. The purpose of
4445 Set number of RCU readers. The value -1 selects
4447 "n" less than -1 selects N-n+1, where N is again
4448 the number of CPUs. For example, -2 selects N
4449 (the number of CPUs), -3 selects N+1, and so on.
4450 A value of "n" less than or equal to -N selects
4463 complete. This is useful for hands-off automated
4470 Write-side holdoff between grace periods,
4487 Enable RCU grace-period forward-progress testing
4491 Specify the fraction of a CPU-stall-warning
4492 period to do tight-loop forward-progress testing.
4496 forward-progress tests.
4500 need_resched() during tight-loop forward-progress
4504 Use conditional/asynchronous update-side
4508 Use expedited update-side primitives, if available.
4511 Use normal (non-expedited) asynchronous
4512 update-side primitives, if available.
4515 Use normal (non-expedited) synchronous
4516 update-side primitives, if available. If all
4520 they are all non-zero.
4528 Leak an RCU-protected pointer out of the reader.
4543 Set number of RCU readers. The value -1 selects
4544 N-1, where N is the number of CPUs. A value
4545 "n" less than -1 selects N-n-2, where N is again
4546 the number of CPUs. For example, -2 selects N
4547 (the number of CPUs), -3 selects N+1, and so on.
4550 Enable debug-object double-call_rcu() testing.
4553 Set time (s) after boot for CPU-hotplug testing.
4556 Set time (jiffies) between CPU-hotplug operations,
4557 or zero to disable CPU-hotplug testing.
4560 Set the number of read-then-exit kthreads used
4562 task-exit processing.
4565 The number of times in a given read-then-exit
4566 episode that a set of read-then-exit kthreads
4571 read-then-exit testing episodes.
4574 Set task-shuffle interval (s). Shuffling tasks
4575 allows some CPUs to go into dyntick-idle mode
4580 is useful for hands-off automated testing.
4589 to any other stall-related activity.
4599 grace-period kthread to test RCU CPU stall
4625 Test RCU's dyntick-idle handling. See also the
4651 Use expedited grace-period primitives, for
4655 real-time latency, and degrade energy efficiency.
4659 Use only normal grace-period primitives,
4662 real-time latency, CPU utilization, and
4664 increased grace-period latency. This parameter
4671 only normal grace-period primitives. No effect
4678 number avoids disturbing real-time workloads,
4695 force - Override the decision by the kernel to hide the
4723 Set test-start holdoff period. The purpose of
4732 but the default has already reduced the per-pass
4737 Set number of readers. The default value of -1
4746 Set the read-side critical-section duration,
4750 Specify the read-protection implementation to test.
4763 See Documentation/admin-guide/cgroup-v1/cpusets.rst.
4771 reservetop= [X86-32]
4793 See Documentation/power/swsusp-and-swap-files.rst
4809 during restoration read-only).
4817 AMD-based UNRET and IBPB mitigations alone do not stop
4819 sibling threads. For that reason, STIBP is used on pro-
4823 off - no mitigation
4824 auto - automatically select a migitation
4825 auto,nosmt - automatically select a mitigation,
4829 ibpb - On AMD, mitigate short speculation
4834 ibpb,nosmt - Like "ibpb" above but will disable SMT
4838 unret - Force enable untrained return thunks,
4839 only effective on AMD f15h-f17h based
4841 unret,nosmt - Like unret, but will disable SMT when STIBP
4869 ro [KNL] Mount root device read-only on boot
4872 on Mark read-only kernel memory as read-only (default).
4873 off Leave read-only kernel memory writable for debugging.
4878 debug-uart get routed to the D+ and D- pins of the usb
4900 rw [KNL] Mount root device read-write on boot
4942 to 10 seconds for built-in smp_call_function()
4949 that requesting even small non-zero numbers of
4956 The default of -1 specifies a number of kthreads
4961 test before initiating CPU-hotplug operations.
4965 CPU-hotplug operations. Specifying zero (which
4966 is the default) disables CPU-hotplug operations.
4972 Non-zero values are useful for automated tests.
4995 "wait" parameter. A value of -1 selects the
4996 default if all other weights are -1. However,
4998 value of -1 will instead select a weight of zero.
5003 non-zero "wait" parameter. See weight_single.
5016 non-zero "wait" parameter. See weight_single
5028 non-zero "wait" parameter. See weight_single
5035 0 -- disable. (may be 1 via CONFIG_CMDLINE="skew_tick=1"
5036 1 -- enable.
5047 0 -- disable.
5048 1 -- enable.
5054 0 -- disable.
5055 1 -- enable.
5058 serialnumber [BUGS=X86-32]
5063 simeth= [IA-64]
5097 memory cgroup sub-caches. 1 to enable, 0 to disable.
5130 smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices
5131 smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port
5132 smsc-ircc2.ircc_sir= [HW] SIR base I/O port
5133 smsc-ircc2.ircc_fir= [HW] FIR base I/O port
5134 smsc-ircc2.ircc_irq= [HW] IRQ line
5135 smsc-ircc2.ircc_dma= [HW] DMA channel
5136 smsc-ircc2.ircc_transceiver= [HW] Transceiver type:
5146 Default: -1 (no limit)
5149 [KNL] Should the soft-lockup detector generate panics.
5152 A value of 1 instructs the soft-lockup detector
5153 to panic the machine when a soft-lockup occurs. It is
5156 respective build-time switch to that functionality.
5159 [KNL] Should the soft-lockup detector generate
5164 See Documentation/admin-guide/laptops/sonypi.rst
5171 on - unconditionally enable, implies
5173 off - unconditionally disable, implies
5175 auto - kernel detects whether your CPU model is
5192 retpoline - replace indirect branches
5193 retpoline,generic - Retpolines
5194 retpoline,lfence - LFENCE; indirect branch
5195 retpoline,amd - alias for retpoline,lfence
5196 eibrs - enhanced IBRS
5197 eibrs,retpoline - enhanced IBRS + Retpolines
5198 eibrs,lfence - enhanced IBRS + LFENCE
5199 ibrs - use IBRS to protect kernel
5209 on - Unconditionally enable mitigations. Is
5212 off - Unconditionally disable mitigations. Is
5215 prctl - Indirect branch speculation is enabled,
5221 - Like "prctl" above, but only STIBP is
5227 - Same as "prctl" above, but all seccomp
5232 - Like "seccomp" above, but only STIBP is
5237 auto - Kernel selects the mitigation depending on
5249 off - Disable mitigation
5250 microcode - Enable microcode mitigation only
5251 safe-ret - Enable sw-only safe RET mitigation (default)
5252 ibpb - Enable mitigation by issuing IBPB on
5254 ibpb-vmexit - Issue IBPB only on VMEXIT
5255 (cloud-specific mitigation)
5280 on - Unconditionally disable Speculative Store Bypass
5281 off - Unconditionally enable Speculative Store Bypass
5282 auto - Kernel detects whether the CPU model contains an
5288 prctl - Control Speculative Store Bypass per thread
5292 seccomp - Same as "prctl" above, but all seccomp threads
5300 on,auto - On Power8 and Power9 insert a store-forwarding
5304 off - No action.
5321 off - not enabled
5323 warn - the kernel will emit rate limited warnings
5328 fatal - the kernel will send SIGBUS to applications
5340 Certain CPUs are vulnerable to an MDS-like
5358 grace-period sequence counter wrap for the
5359 srcu_data structure's ->srcu_gp_seq_needed field.
5381 force-on: Unconditionally enable mitigation for
5383 force-off: Unconditionally disable mitigation for
5406 stacktrace_filter=[function-list]
5408 will trace at boot up. function-list is a comma separated
5416 Set the STI (builtin display/keyboard on the HP-PARISC
5418 as the initial boot-console.
5459 to global on non-NUMA machines)
5485 it if 0 is given (See Documentation/admin-guide/cgroup-v1/memory.rst)
5487 swiotlb= [ARM,IA-64,PPC,MIPS,X86]
5489 <int> -- Number of I/O TLB slabs
5490 force -- force using of bounce buffers even if they
5492 noforce -- Never use bounce buffers (for debugging)
5516 Ignore sysrq setting - this boot parameter will
5524 cache size. See Documentation/networking/ip-sysctl.rst
5530 Specify "mem" (for Suspend-to-RAM) or "standby" (for
5535 wakeup-capable RTC alarm.
5541 -1: disable all active trip points in all thermal zones
5545 -1: disable all critical trip points in all thermal zones
5556 -1: disable all passive trip points
5562 <deci-seconds>: poll all this frequency
5584 Prevent the CPU-hotplug component of torturing
5588 Dump the ftrace buffer at torture-test shutdown,
5592 with rotating-rust storage.
5608 trace_event=[event-list]
5610 to facilitate early boot debugging. The event-list is a
5614 trace_options=[option-list]
5616 The option-list is a comma delimited list of options
5666 See Documentation/admin-guide/mm/transhuge.rst
5674 high-resolution timer mode on older hardware, and in
5700 on - Enable TSX on the system. Although there are
5703 several previous speculation-related CVEs, and
5707 off - Disable TSX on the system. (Note that this
5715 auto - Disable TSX if X86_BUG_TAA is present,
5720 See Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
5726 Similar to Micro-architectural Data Sampling (MDS)
5741 full - Enable TAA mitigation on vulnerable CPUs
5744 full,nosmt - Enable TAA mitigation and disable SMT on
5747 vulnerable to cross-thread TAA attacks.
5748 off - Unconditionally disable TAA mitigation
5750 On MDS-affected machines, tsx_async_abort=off can be
5762 Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
5768 See also Documentation/input/devices/joystick-parport.rst
5770 udbg-immortal [PPC] When debugging early kernel crashes that
5776 Set number of hash buckets for UDP/UDP-Lite connections
5778 uhci-hcd.ignore_oc=
5780 Some badly-designed motherboards generate lots of
5791 (default -1 = authorized except for wireless USB,
5797 for newly-detected USB devices (default 2). This
5825 [USB] Specifies timeout for the initial 64-byte
5832 [USB] A list of quirk entries to augment the built-in
5835 VendorID:ProductID:Flags. The IDs are 4-digit hex
5837 will change the built-in quirk; setting it if it is
5842 a 255-byte read);
5846 Set-Interface requests);
5865 (bInterval-1).
5900 usb-storage.delay_use=
5904 usb-storage.quirks=
5906 override the built-in unusual_devs list. List
5909 and Product ID values (4-digit hex numbers) and
5911 to a common usb-storage quirk flag as follows:
5953 medium is write-protected).
5962 1 - undefined instruction events
5963 2 - system calls
5964 4 - invalid data aborts
5965 8 - SIGSEGV faults
5966 16 - SIGBUS faults
5982 vdso32= [X86] Control the 32-bit vDSO
5983 vdso32=1: enable 32-bit VDSO
5984 vdso32=0 or vdso32=2: disable 32-bit VDSO
5994 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
5996 vector= [IA-64,SMP]
6027 vga= [BOOT,X86-32] Select a particular video mode
6029 Documentation/admin-guide/svga.rst.
6044 - Disable all of the above options
6065 vsyscall= [X86-64]
6068 code). Most statically-linked binaries and older
6092 see VGA-softcursor.txt. Default: 2 = underline.
6097 This is a 16-member array composed of values
6098 ranging from 0-255.
6103 This is a 16-member array composed of values
6104 ranging from 0-255.
6109 This is a 16-member array composed of values
6110 ranging from 0-255.
6115 Set system-wide default UTF-8 mode for all tty's.
6116 Default is 1, i.e. UTF-8 mode is enabled for all
6121 Format=<-1|0|1>
6122 Set system-wide default for whether a cursor
6123 is shown on new VTs. Default is -1,
6128 vt.italic= [VT] Default color for italic text; 0-15.
6131 vt.underline= [VT] Default color for underlined text; 0-15.
6135 see Documentation/watchdog/watchdog-parameters.rst
6136 or other driver-specific files in the
6162 that this also can be controlled per-workqueue for
6166 Per-cpu workqueues are generally preferred because
6168 locality; unfortunately, per-cpu workqueues tend to
6171 Enabling this makes the per-cpu workqueues which
6186 forces round-robin CPU selection to flush out
6191 x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of
6195 x86_intel_mid_timer= [X86-32,APBT]
6201 xen_512gb_limit [KNL,X86-64,XEN]
6211 ide-disks -- unplug primary master IDE devices
6212 aux-ide-disks -- unplug non-primary-master IDE devices
6213 nics -- unplug network devices
6214 all -- unplug all emulated devices (NICs and IDE disks)
6215 unnecessary -- unplugging emulated devices is
6218 never -- do not unplug even if version check succeeds
6245 xen_timer_slop= [X86-64,XEN]
6270 preferred over the 2-level event handling, as it is
6297 xhci-hcd.quirks [USB,KNL]