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1 .. SPDX-License-Identifier: GPL-2.0
21 there is a different cpu-freq driver for each generation.
23 Note that the driver's will not load on the "wrong" hardware,
29 to load on processors without this capability. The capability
37 6th Generation: powernow-k6
39 7th Generation: powernow-k7: Athlon, Duron, Geode.
41 8th Generation: powernow-k8: Athlon, Athlon 64, Opteron, Sempron.
42 Documentation on this functionality in 8th generation processors
46 BIOS supplied data, for powernow-k7 and for powernow-k8, may be
49 The powernow-k8 driver will attempt to use ACPI if so configured,
51 The powernow-k7 driver will try to use the PSB support first, and
57 ``cpufreq-nforce2``
62 The cpufreq-nforce2 driver changes the FSB on nVidia nForce2 platforms.
64 This works better than on other platforms, because the FSB of the CPU
73 min_fsb defaults to FSB at boot time - 50 MHz.
80 ``pcc-cpufreq``
86 * pcc-cpufreq.txt - PCC interface documentation
89 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
95 ---------------------------------
98 ---------
101 1.1.1 Get Average Frequency
112 ----------------
117 The PCC driver (pcc-cpufreq) allows OSPM to take advantage of the PCC
127 ------------------
129 https://acpica.org/sites/acpica/files/Processor-Clocking-Control-v1p0.pdf
131 PCC relies on a shared memory region that provides a channel for communication
138 "status" interface. PCCH() also contains details on how to access the platform
142 * Get Average Frequency
151 the native P-state driver (such as acpi-cpufreq for Intel, powernow-k8 for
155 computes the required performance for each processor based on server workload.
165 1.1.1 Get Average Frequency:
166 ----------------------------
169 indicates the average unhalted frequency of the logical processor expressed as
174 ----------------------------
177 ignored by OSPM. The next invocation of "Get Average Frequency" will inform
181 -----------------------
182 The PCC driver will load on any system where the platform firmware:
187 Currently, certain HP ProLiant platforms implement the PCC interface. On those
191 such an instance, as is also the case on platforms where the PCC interface
195 ---------------------------
200 pcc-cpufreq: (v1.00.00) driver loaded with frequency limits: 1600 MHz, 2933
207 to a corresponding P-state.
211 ----- --
213 | -- this will increase with bug fixes/enhancements to the driver
214 |-- this is the version of the PCC specification the driver adheres to
217 The following is a brief discussion on some of the fields exported via the
221 ----------------------------------
225 to be strictly associated with a P-state.
228 -------------------------------
233 ---------------------
236 This is due to "turbo boost" available on recent Intel processors. If certain
243 B) There is a round-off error associated with the cpuinfo_cur_freq value.
257 corresponds to the frequency of the P0 P-state.
260 -----------------
271 -----------
274 provides information wrt each P-state, it is not applicable to the PCC driver.