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 int ret;
32
33 va_start(param, num);
34 p = va_arg(param, struct resctrl_val_param *);
35 va_end(param);
36
37 if (runs_per_allocation >= NUM_OF_RUNS)
38 runs_per_allocation = 0;
39
40 /* Only set up schemata once every NUM_OF_RUNS of allocations */
41 if (runs_per_allocation++ != 0)
42 return 0;
43
44 if (allocation < ALLOCATION_MIN || allocation > ALLOCATION_MAX)
45 return -1;
46
47 sprintf(allocation_str, "%d", allocation);
48
49 ret = write_schemata(p->ctrlgrp, allocation_str, p->cpu_no,
50 p->resctrl_val);
51 if (ret < 0)
52 return ret;
53
54 allocation -= ALLOCATION_STEP;
55
56 return 0;
57 }
58
show_mba_info(unsigned long * bw_imc,unsigned long * bw_resc)59 static void show_mba_info(unsigned long *bw_imc, unsigned long *bw_resc)
60 {
61 int allocation, runs;
62 bool failed = false;
63
64 printf("# Results are displayed in (MB)\n");
65 /* Memory bandwidth from 100% down to 10% */
66 for (allocation = 0; allocation < ALLOCATION_MAX / ALLOCATION_STEP;
67 allocation++) {
68 unsigned long avg_bw_imc, avg_bw_resc;
69 unsigned long sum_bw_imc = 0, sum_bw_resc = 0;
70 unsigned long avg_diff;
71
72 /*
73 * The first run is discarded due to inaccurate value from
74 * phase transition.
75 */
76 for (runs = NUM_OF_RUNS * allocation + 1;
77 runs < NUM_OF_RUNS * allocation + NUM_OF_RUNS ; runs++) {
78 sum_bw_imc += bw_imc[runs];
79 sum_bw_resc += bw_resc[runs];
80 }
81
82 avg_bw_imc = sum_bw_imc / (NUM_OF_RUNS - 1);
83 avg_bw_resc = sum_bw_resc / (NUM_OF_RUNS - 1);
84 avg_diff = labs((long)(avg_bw_resc - avg_bw_imc));
85
86 printf("%sok MBA schemata percentage %u smaller than %d %%\n",
87 avg_diff > MAX_DIFF ? "not " : "",
88 ALLOCATION_MAX - ALLOCATION_STEP * allocation,
89 MAX_DIFF);
90 tests_run++;
91 printf("# avg_diff: %lu\n", avg_diff);
92 printf("# avg_bw_imc: %lu\n", avg_bw_imc);
93 printf("# avg_bw_resc: %lu\n", avg_bw_resc);
94 if (avg_diff > MAX_DIFF)
95 failed = true;
96 }
97
98 printf("%sok schemata change using MBA%s\n", failed ? "not " : "",
99 failed ? " # at least one test failed" : "");
100 tests_run++;
101 }
102
check_results(void)103 static int check_results(void)
104 {
105 char *token_array[8], output[] = RESULT_FILE_NAME, temp[512];
106 unsigned long bw_imc[1024], bw_resc[1024];
107 int runs;
108 FILE *fp;
109
110 fp = fopen(output, "r");
111 if (!fp) {
112 perror(output);
113
114 return errno;
115 }
116
117 runs = 0;
118 while (fgets(temp, sizeof(temp), fp)) {
119 char *token = strtok(temp, ":\t");
120 int fields = 0;
121
122 while (token) {
123 token_array[fields++] = token;
124 token = strtok(NULL, ":\t");
125 }
126
127 /* Field 3 is perf imc value */
128 bw_imc[runs] = strtoul(token_array[3], NULL, 0);
129 /* Field 5 is resctrl value */
130 bw_resc[runs] = strtoul(token_array[5], NULL, 0);
131 runs++;
132 }
133
134 fclose(fp);
135
136 show_mba_info(bw_imc, bw_resc);
137
138 return 0;
139 }
140
mba_test_cleanup(void)141 void mba_test_cleanup(void)
142 {
143 remove(RESULT_FILE_NAME);
144 }
145
mba_schemata_change(int cpu_no,char * bw_report,char ** benchmark_cmd)146 int mba_schemata_change(int cpu_no, char *bw_report, char **benchmark_cmd)
147 {
148 struct resctrl_val_param param = {
149 .resctrl_val = MBA_STR,
150 .ctrlgrp = "c1",
151 .mongrp = "m1",
152 .cpu_no = cpu_no,
153 .mum_resctrlfs = 1,
154 .filename = RESULT_FILE_NAME,
155 .bw_report = bw_report,
156 .setup = mba_setup
157 };
158 int ret;
159
160 remove(RESULT_FILE_NAME);
161
162 if (!validate_resctrl_feature_request("mba"))
163 return -1;
164
165 ret = resctrl_val(benchmark_cmd, ¶m);
166 if (ret)
167 return ret;
168
169 ret = check_results();
170 if (ret)
171 return ret;
172
173 mba_test_cleanup();
174
175 return 0;
176 }
177