diff mbox series

[v5,14/21] selftests/resctrl: Fix MBA/MBM results reporting format

Message ID 20210307145502.2916364-15-fenghua.yu@intel.com
State Accepted
Commit 06bd03a57f8c2e3a8698a7ce7dead4ef18e00902
Headers show
Series Miscellaneous fixes for resctrl selftests | expand

Commit Message

Fenghua Yu March 7, 2021, 2:54 p.m. UTC
MBM unit test starts fill_buf (default built-in benchmark) in a new con_mon
group (c1, m1) and records resctrl reported mbm values and iMC (Integrated
Memory Controller) values every second. It does this for five seconds
(randomly chosen value) in total. It then calculates average of resctrl_mbm
values and imc_mbm values and if the difference is greater than 300 MB/sec
(randomly chosen value), the test treats it as a failure. MBA unit test is
similar to MBM but after every run it changes schemata.

Checking for a difference of 300 MB/sec doesn't look very meaningful when
the mbm values are changing over a wide range. For example, below are the
values running MBA test on SKL with different allocations

1. With 10% as schemata both iMC and resctrl mbm_values are around 2000
   MB/sec
2. With 100% as schemata both iMC and resctrl mbm_values are around 10000
   MB/sec

A 300 MB/sec difference between resctrl_mbm and imc_mbm values is
acceptable at 100% schemata but it isn't acceptable at 10% schemata because
that's a huge difference.

So, fix this by checking for percentage difference instead of absolute
difference i.e. check if the difference between resctrl_mbm value and
imc_mbm value is within 5% (randomly chosen value) of imc_mbm value. If the
difference is greater than 5% of imc_mbm value, treat it is a failure.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
---
 tools/testing/selftests/resctrl/mba_test.c | 22 +++++++++++++---------
 tools/testing/selftests/resctrl/mbm_test.c | 15 ++++++++-------
 2 files changed, 21 insertions(+), 16 deletions(-)
diff mbox series

Patch

diff --git a/tools/testing/selftests/resctrl/mba_test.c b/tools/testing/selftests/resctrl/mba_test.c
index 3a226effe80c..fd66a831062c 100644
--- a/tools/testing/selftests/resctrl/mba_test.c
+++ b/tools/testing/selftests/resctrl/mba_test.c
@@ -12,7 +12,7 @@ 
 
 #define RESULT_FILE_NAME	"result_mba"
 #define NUM_OF_RUNS		5
-#define MAX_DIFF		300
+#define MAX_DIFF_PERCENT	5
 #define ALLOCATION_MAX		100
 #define ALLOCATION_MIN		10
 #define ALLOCATION_STEP		10
@@ -62,7 +62,8 @@  static void show_mba_info(unsigned long *bw_imc, unsigned long *bw_resc)
 	     allocation++) {
 		unsigned long avg_bw_imc, avg_bw_resc;
 		unsigned long sum_bw_imc = 0, sum_bw_resc = 0;
-		unsigned long avg_diff;
+		int avg_diff_per;
+		float avg_diff;
 
 		/*
 		 * The first run is discarded due to inaccurate value from
@@ -76,16 +77,19 @@  static void show_mba_info(unsigned long *bw_imc, unsigned long *bw_resc)
 
 		avg_bw_imc = sum_bw_imc / (NUM_OF_RUNS - 1);
 		avg_bw_resc = sum_bw_resc / (NUM_OF_RUNS - 1);
-		avg_diff = labs((long)(avg_bw_resc - avg_bw_imc));
+		avg_diff = (float)labs(avg_bw_resc - avg_bw_imc) / avg_bw_imc;
+		avg_diff_per = (int)(avg_diff * 100);
 
-		ksft_print_msg("%s MBA schemata percentage %u smaller than %d %%\n",
-			       avg_diff > MAX_DIFF ? "fail:" : "pass:",
-			       ALLOCATION_MAX - ALLOCATION_STEP * allocation,
-			       MAX_DIFF);
-		ksft_print_msg("avg_diff: %lu\n", avg_diff);
+		ksft_print_msg("%s MBA: diff within %d%% for schemata %u\n",
+			       avg_diff_per > MAX_DIFF_PERCENT ?
+			       "fail:" : "pass:",
+			       MAX_DIFF_PERCENT,
+			       ALLOCATION_MAX - ALLOCATION_STEP * allocation);
+
+		ksft_print_msg("avg_diff_per: %d%%\n", avg_diff_per);
 		ksft_print_msg("avg_bw_imc: %lu\n", avg_bw_imc);
 		ksft_print_msg("avg_bw_resc: %lu\n", avg_bw_resc);
-		if (avg_diff > MAX_DIFF)
+		if (avg_diff_per > MAX_DIFF_PERCENT)
 			failed = true;
 	}
 
diff --git a/tools/testing/selftests/resctrl/mbm_test.c b/tools/testing/selftests/resctrl/mbm_test.c
index 2b4f26013d84..44a89e0267eb 100644
--- a/tools/testing/selftests/resctrl/mbm_test.c
+++ b/tools/testing/selftests/resctrl/mbm_test.c
@@ -11,7 +11,7 @@ 
 #include "resctrl.h"
 
 #define RESULT_FILE_NAME	"result_mbm"
-#define MAX_DIFF		300
+#define MAX_DIFF_PERCENT	5
 #define NUM_OF_RUNS		5
 
 static int
@@ -19,8 +19,8 @@  show_bw_info(unsigned long *bw_imc, unsigned long *bw_resc, int span)
 {
 	unsigned long avg_bw_imc = 0, avg_bw_resc = 0;
 	unsigned long sum_bw_imc = 0, sum_bw_resc = 0;
-	long avg_diff = 0;
-	int runs, ret;
+	int runs, ret, avg_diff_per;
+	float avg_diff = 0;
 
 	/*
 	 * Discard the first value which is inaccurate due to monitoring setup
@@ -33,12 +33,13 @@  show_bw_info(unsigned long *bw_imc, unsigned long *bw_resc, int span)
 
 	avg_bw_imc = sum_bw_imc / 4;
 	avg_bw_resc = sum_bw_resc / 4;
-	avg_diff = avg_bw_resc - avg_bw_imc;
+	avg_diff = (float)labs(avg_bw_resc - avg_bw_imc) / avg_bw_imc;
+	avg_diff_per = (int)(avg_diff * 100);
 
-	ret = labs(avg_diff) > MAX_DIFF;
+	ret = avg_diff_per > MAX_DIFF_PERCENT;
 	ksft_print_msg("%s MBM: diff within %d%%\n",
-		       ret ? "fail:" : "pass:", MAX_DIFF);
-	ksft_print_msg("avg_diff: %lu\n", labs(avg_diff));
+		       ret ? "fail:" : "pass:", MAX_DIFF_PERCENT);
+	ksft_print_msg("avg_diff_per: %d%%\n", avg_diff_per);
 	ksft_print_msg("Span (MB): %d\n", span);
 	ksft_print_msg("avg_bw_imc: %lu\n", avg_bw_imc);
 	ksft_print_msg("avg_bw_resc: %lu\n", avg_bw_resc);