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171 lines
3.9 KiB
171 lines
3.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Memory Bandwidth Allocation (MBA) test |
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* |
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* Copyright (C) 2018 Intel Corporation |
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* |
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* Authors: |
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* Sai Praneeth Prakhya <[email protected]>, |
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* Fenghua Yu <[email protected]> |
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*/ |
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#include "resctrl.h" |
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#define RESULT_FILE_NAME "result_mba" |
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#define NUM_OF_RUNS 5 |
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#define MAX_DIFF 300 |
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#define ALLOCATION_MAX 100 |
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#define ALLOCATION_MIN 10 |
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#define ALLOCATION_STEP 10 |
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/* |
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* Change schemata percentage from 100 to 10%. Write schemata to specified |
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* con_mon grp, mon_grp in resctrl FS. |
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* For each allocation, run 5 times in order to get average values. |
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*/ |
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static int mba_setup(int num, ...) |
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{ |
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static int runs_per_allocation, allocation = 100; |
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struct resctrl_val_param *p; |
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char allocation_str[64]; |
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va_list param; |
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va_start(param, num); |
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p = va_arg(param, struct resctrl_val_param *); |
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va_end(param); |
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if (runs_per_allocation >= NUM_OF_RUNS) |
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runs_per_allocation = 0; |
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/* Only set up schemata once every NUM_OF_RUNS of allocations */ |
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if (runs_per_allocation++ != 0) |
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return 0; |
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if (allocation < ALLOCATION_MIN || allocation > ALLOCATION_MAX) |
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return -1; |
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sprintf(allocation_str, "%d", allocation); |
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write_schemata(p->ctrlgrp, allocation_str, p->cpu_no, p->resctrl_val); |
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allocation -= ALLOCATION_STEP; |
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return 0; |
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} |
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static void show_mba_info(unsigned long *bw_imc, unsigned long *bw_resc) |
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{ |
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int allocation, runs; |
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bool failed = false; |
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printf("# Results are displayed in (MB)\n"); |
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/* Memory bandwidth from 100% down to 10% */ |
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for (allocation = 0; allocation < ALLOCATION_MAX / ALLOCATION_STEP; |
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allocation++) { |
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unsigned long avg_bw_imc, avg_bw_resc; |
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unsigned long sum_bw_imc = 0, sum_bw_resc = 0; |
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unsigned long avg_diff; |
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/* |
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* The first run is discarded due to inaccurate value from |
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* phase transition. |
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*/ |
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for (runs = NUM_OF_RUNS * allocation + 1; |
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runs < NUM_OF_RUNS * allocation + NUM_OF_RUNS ; runs++) { |
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sum_bw_imc += bw_imc[runs]; |
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sum_bw_resc += bw_resc[runs]; |
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} |
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avg_bw_imc = sum_bw_imc / (NUM_OF_RUNS - 1); |
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avg_bw_resc = sum_bw_resc / (NUM_OF_RUNS - 1); |
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avg_diff = labs((long)(avg_bw_resc - avg_bw_imc)); |
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printf("%sok MBA schemata percentage %u smaller than %d %%\n", |
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avg_diff > MAX_DIFF ? "not " : "", |
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ALLOCATION_MAX - ALLOCATION_STEP * allocation, |
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MAX_DIFF); |
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tests_run++; |
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printf("# avg_diff: %lu\n", avg_diff); |
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printf("# avg_bw_imc: %lu\n", avg_bw_imc); |
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printf("# avg_bw_resc: %lu\n", avg_bw_resc); |
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if (avg_diff > MAX_DIFF) |
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failed = true; |
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} |
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printf("%sok schemata change using MBA%s\n", failed ? "not " : "", |
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failed ? " # at least one test failed" : ""); |
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tests_run++; |
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} |
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static int check_results(void) |
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{ |
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char *token_array[8], output[] = RESULT_FILE_NAME, temp[512]; |
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unsigned long bw_imc[1024], bw_resc[1024]; |
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int runs; |
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FILE *fp; |
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fp = fopen(output, "r"); |
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if (!fp) { |
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perror(output); |
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return errno; |
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} |
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runs = 0; |
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while (fgets(temp, sizeof(temp), fp)) { |
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char *token = strtok(temp, ":\t"); |
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int fields = 0; |
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while (token) { |
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token_array[fields++] = token; |
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token = strtok(NULL, ":\t"); |
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} |
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/* Field 3 is perf imc value */ |
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bw_imc[runs] = strtoul(token_array[3], NULL, 0); |
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/* Field 5 is resctrl value */ |
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bw_resc[runs] = strtoul(token_array[5], NULL, 0); |
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runs++; |
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} |
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fclose(fp); |
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show_mba_info(bw_imc, bw_resc); |
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return 0; |
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} |
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void mba_test_cleanup(void) |
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{ |
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remove(RESULT_FILE_NAME); |
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} |
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int mba_schemata_change(int cpu_no, char *bw_report, char **benchmark_cmd) |
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{ |
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struct resctrl_val_param param = { |
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.resctrl_val = MBA_STR, |
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.ctrlgrp = "c1", |
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.mongrp = "m1", |
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.cpu_no = cpu_no, |
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.mum_resctrlfs = 1, |
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.filename = RESULT_FILE_NAME, |
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.bw_report = bw_report, |
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.setup = mba_setup |
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}; |
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int ret; |
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remove(RESULT_FILE_NAME); |
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if (!validate_resctrl_feature_request("mba")) |
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return -1; |
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ret = resctrl_val(benchmark_cmd, ¶m); |
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if (ret) |
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return ret; |
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ret = check_results(); |
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if (ret) |
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return ret; |
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mba_test_cleanup(); |
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return 0; |
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}
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