1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Memory Bandwidth Allocation (MBA) test
4 *
5 * Copyright (C) 2018 Intel Corporation
6 *
7 * Authors:
8 * Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>,
9 * Fenghua Yu <fenghua.yu@intel.com>
10 */
11 #include "resctrl.h"
12
13 #define RESULT_FILE_NAME "result_mba"
14 #define NUM_OF_RUNS 5
15 #define MAX_DIFF 300
16 #define ALLOCATION_MAX 100
17 #define ALLOCATION_MIN 10
18 #define ALLOCATION_STEP 10
19
20 /*
21 * Change schemata percentage from 100 to 10%. Write schemata to specified
22 * con_mon grp, mon_grp in resctrl FS.
23 * For each allocation, run 5 times in order to get average values.
24 */
mba_setup(int num,...)25 static int mba_setup(int num, ...)
26 {
27 static int runs_per_allocation, allocation = 100;
28 struct resctrl_val_param *p;
29 char allocation_str[64];
30 va_list param;
31
32 va_start(param, num);
33 p = va_arg(param, struct resctrl_val_param *);
34 va_end(param);
35
36 if (runs_per_allocation >= NUM_OF_RUNS)
37 runs_per_allocation = 0;
38
39 /* Only set up schemata once every NUM_OF_RUNS of allocations */
40 if (runs_per_allocation++ != 0)
41 return 0;
42
43 if (allocation < ALLOCATION_MIN || allocation > ALLOCATION_MAX)
44 return -1;
45
46 sprintf(allocation_str, "%d", allocation);
47
48 write_schemata(p->ctrlgrp, allocation_str, p->cpu_no, p->resctrl_val);
49 allocation -= ALLOCATION_STEP;
50
51 return 0;
52 }
53
show_mba_info(unsigned long * bw_imc,unsigned long * bw_resc)54 static void show_mba_info(unsigned long *bw_imc, unsigned long *bw_resc)
55 {
56 int allocation, runs;
57 bool failed = false;
58
59 printf("# Results are displayed in (MB)\n");
60 /* Memory bandwidth from 100% down to 10% */
61 for (allocation = 0; allocation < ALLOCATION_MAX / ALLOCATION_STEP;
62 allocation++) {
63 unsigned long avg_bw_imc, avg_bw_resc;
64 unsigned long sum_bw_imc = 0, sum_bw_resc = 0;
65 unsigned long avg_diff;
66
67 /*
68 * The first run is discarded due to inaccurate value from
69 * phase transition.
70 */
71 for (runs = NUM_OF_RUNS * allocation + 1;
72 runs < NUM_OF_RUNS * allocation + NUM_OF_RUNS ; runs++) {
73 sum_bw_imc += bw_imc[runs];
74 sum_bw_resc += bw_resc[runs];
75 }
76
77 avg_bw_imc = sum_bw_imc / (NUM_OF_RUNS - 1);
78 avg_bw_resc = sum_bw_resc / (NUM_OF_RUNS - 1);
79 avg_diff = labs((long)(avg_bw_resc - avg_bw_imc));
80
81 printf("%sok MBA schemata percentage %u smaller than %d %%\n",
82 avg_diff > MAX_DIFF ? "not " : "",
83 ALLOCATION_MAX - ALLOCATION_STEP * allocation,
84 MAX_DIFF);
85 tests_run++;
86 printf("# avg_diff: %lu\n", avg_diff);
87 printf("# avg_bw_imc: %lu\n", avg_bw_imc);
88 printf("# avg_bw_resc: %lu\n", avg_bw_resc);
89 if (avg_diff > MAX_DIFF)
90 failed = true;
91 }
92
93 printf("%sok schemata change using MBA%s\n", failed ? "not " : "",
94 failed ? " # at least one test failed" : "");
95 tests_run++;
96 }
97
check_results(void)98 static int check_results(void)
99 {
100 char *token_array[8], output[] = RESULT_FILE_NAME, temp[512];
101 unsigned long bw_imc[1024], bw_resc[1024];
102 int runs;
103 FILE *fp;
104
105 fp = fopen(output, "r");
106 if (!fp) {
107 perror(output);
108
109 return errno;
110 }
111
112 runs = 0;
113 while (fgets(temp, sizeof(temp), fp)) {
114 char *token = strtok(temp, ":\t");
115 int fields = 0;
116
117 while (token) {
118 token_array[fields++] = token;
119 token = strtok(NULL, ":\t");
120 }
121
122 /* Field 3 is perf imc value */
123 bw_imc[runs] = strtoul(token_array[3], NULL, 0);
124 /* Field 5 is resctrl value */
125 bw_resc[runs] = strtoul(token_array[5], NULL, 0);
126 runs++;
127 }
128
129 fclose(fp);
130
131 show_mba_info(bw_imc, bw_resc);
132
133 return 0;
134 }
135
mba_test_cleanup(void)136 void mba_test_cleanup(void)
137 {
138 remove(RESULT_FILE_NAME);
139 }
140
mba_schemata_change(int cpu_no,char * bw_report,char ** benchmark_cmd)141 int mba_schemata_change(int cpu_no, char *bw_report, char **benchmark_cmd)
142 {
143 struct resctrl_val_param param = {
144 .resctrl_val = MBA_STR,
145 .ctrlgrp = "c1",
146 .mongrp = "m1",
147 .cpu_no = cpu_no,
148 .mum_resctrlfs = 1,
149 .filename = RESULT_FILE_NAME,
150 .bw_report = bw_report,
151 .setup = mba_setup
152 };
153 int ret;
154
155 remove(RESULT_FILE_NAME);
156
157 if (!validate_resctrl_feature_request("mba"))
158 return -1;
159
160 ret = resctrl_val(benchmark_cmd, ¶m);
161 if (ret)
162 return ret;
163
164 ret = check_results();
165 if (ret)
166 return ret;
167
168 mba_test_cleanup();
169
170 return 0;
171 }
172