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_PERCENT 8 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 */ 25 static int mba_setup(const struct resctrl_test *test, 26 const struct user_params *uparams, 27 struct resctrl_val_param *p) 28 { 29 static int runs_per_allocation, allocation = 100; 30 char allocation_str[64]; 31 int ret; 32 33 if (runs_per_allocation >= NUM_OF_RUNS) 34 runs_per_allocation = 0; 35 36 /* Only set up schemata once every NUM_OF_RUNS of allocations */ 37 if (runs_per_allocation++ != 0) 38 return 0; 39 40 if (allocation < ALLOCATION_MIN || allocation > ALLOCATION_MAX) 41 return END_OF_TESTS; 42 43 sprintf(allocation_str, "%d", allocation); 44 45 ret = write_schemata(p->ctrlgrp, allocation_str, uparams->cpu, test->resource); 46 if (ret < 0) 47 return ret; 48 49 allocation -= ALLOCATION_STEP; 50 51 return 0; 52 } 53 54 static bool show_mba_info(unsigned long *bw_imc, unsigned long *bw_resc) 55 { 56 int allocation, runs; 57 bool ret = false; 58 59 ksft_print_msg("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 sum_bw_imc = 0, sum_bw_resc = 0; 64 long avg_bw_imc, avg_bw_resc; 65 int avg_diff_per; 66 float avg_diff; 67 68 /* 69 * The first run is discarded due to inaccurate value from 70 * phase transition. 71 */ 72 for (runs = NUM_OF_RUNS * allocation + 1; 73 runs < NUM_OF_RUNS * allocation + NUM_OF_RUNS ; runs++) { 74 sum_bw_imc += bw_imc[runs]; 75 sum_bw_resc += bw_resc[runs]; 76 } 77 78 avg_bw_imc = sum_bw_imc / (NUM_OF_RUNS - 1); 79 avg_bw_resc = sum_bw_resc / (NUM_OF_RUNS - 1); 80 avg_diff = (float)labs(avg_bw_resc - avg_bw_imc) / avg_bw_imc; 81 avg_diff_per = (int)(avg_diff * 100); 82 83 ksft_print_msg("%s Check MBA diff within %d%% for schemata %u\n", 84 avg_diff_per > MAX_DIFF_PERCENT ? 85 "Fail:" : "Pass:", 86 MAX_DIFF_PERCENT, 87 ALLOCATION_MAX - ALLOCATION_STEP * allocation); 88 89 ksft_print_msg("avg_diff_per: %d%%\n", avg_diff_per); 90 ksft_print_msg("avg_bw_imc: %lu\n", avg_bw_imc); 91 ksft_print_msg("avg_bw_resc: %lu\n", avg_bw_resc); 92 if (avg_diff_per > MAX_DIFF_PERCENT) 93 ret = true; 94 } 95 96 ksft_print_msg("%s Check schemata change using MBA\n", 97 ret ? "Fail:" : "Pass:"); 98 if (ret) 99 ksft_print_msg("At least one test failed\n"); 100 101 return ret; 102 } 103 104 static int check_results(void) 105 { 106 char *token_array[8], output[] = RESULT_FILE_NAME, temp[512]; 107 unsigned long bw_imc[1024], bw_resc[1024]; 108 int runs; 109 FILE *fp; 110 111 fp = fopen(output, "r"); 112 if (!fp) { 113 ksft_perror(output); 114 115 return -1; 116 } 117 118 runs = 0; 119 while (fgets(temp, sizeof(temp), fp)) { 120 char *token = strtok(temp, ":\t"); 121 int fields = 0; 122 123 while (token) { 124 token_array[fields++] = token; 125 token = strtok(NULL, ":\t"); 126 } 127 128 /* Field 3 is perf imc value */ 129 bw_imc[runs] = strtoul(token_array[3], NULL, 0); 130 /* Field 5 is resctrl value */ 131 bw_resc[runs] = strtoul(token_array[5], NULL, 0); 132 runs++; 133 } 134 135 fclose(fp); 136 137 return show_mba_info(bw_imc, bw_resc); 138 } 139 140 static void mba_test_cleanup(void) 141 { 142 remove(RESULT_FILE_NAME); 143 } 144 145 static int mba_run_test(const struct resctrl_test *test, const struct user_params *uparams) 146 { 147 struct resctrl_val_param param = { 148 .resctrl_val = MBA_STR, 149 .ctrlgrp = "c1", 150 .mongrp = "m1", 151 .filename = RESULT_FILE_NAME, 152 .bw_report = "reads", 153 .setup = mba_setup 154 }; 155 int ret; 156 157 remove(RESULT_FILE_NAME); 158 159 ret = resctrl_val(test, uparams, uparams->benchmark_cmd, ¶m); 160 if (ret) 161 return ret; 162 163 ret = check_results(); 164 165 return ret; 166 } 167 168 static bool mba_feature_check(const struct resctrl_test *test) 169 { 170 return test_resource_feature_check(test) && 171 resctrl_mon_feature_exists("L3_MON", "mbm_local_bytes"); 172 } 173 174 struct resctrl_test mba_test = { 175 .name = "MBA", 176 .resource = "MB", 177 .vendor_specific = ARCH_INTEL, 178 .feature_check = mba_feature_check, 179 .run_test = mba_run_test, 180 .cleanup = mba_test_cleanup, 181 }; 182