linux-kernel - [PATCH v4 7/7] selftests/resctrl: Reduce failures due to outliers in MBA/MBM tests

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Date:   Mon,  2 Oct 2023 12:48:13 +0300
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     linux-kselftest@...r.kernel.org, Shuah Khan <shuah@...nel.org>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Maciej Wieczór-Retman 
        <maciej.wieczor-retman@...el.com>,
        Shaopeng Tan <tan.shaopeng@...fujitsu.com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH v4 7/7] selftests/resctrl: Reduce failures due to outliers in MBA/MBM tests

The initial value of 5% chosen for the maximum allowed percentage
difference between resctrl mbm value and IMC mbm value in commit
06bd03a57f8c ("selftests/resctrl: Fix MBA/MBM results reporting
format") was "randomly chosen value" (as admitted by the changelog).

When running tests in our lab across a large number platforms, 5%
difference upper bound for success seems a bit on the low side for the
MBA and MBM tests. Some platforms produce outliers that are slightly
above that, typically 6-7%, which leads MBA/MBM test frequently
failing.

Replace the "randomly chosen value" with a success bound that is based
on those measurements across large number of platforms by relaxing the
MBA/MBM success bound to 8%. The relaxed bound removes the failures due
the frequent outliers.

Fixes: 06bd03a57f8c ("selftests/resctrl: Fix MBA/MBM results reporting format")
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Tested-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>
Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>
Cc: <stable@...r.kernel.org>
---
 tools/testing/selftests/resctrl/mba_test.c | 2 +-
 tools/testing/selftests/resctrl/mbm_test.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/resctrl/mba_test.c b/tools/testing/selftests/resctrl/mba_test.c
index cf8284dadcb2..d3bf4368341e 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_PERCENT	5
+#define MAX_DIFF_PERCENT	8
 #define ALLOCATION_MAX		100
 #define ALLOCATION_MIN		10
 #define ALLOCATION_STEP		10
diff --git a/tools/testing/selftests/resctrl/mbm_test.c b/tools/testing/selftests/resctrl/mbm_test.c
index 1ae131a2e246..d3c0d30c676a 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_PERCENT	5
+#define MAX_DIFF_PERCENT	8
 #define NUM_OF_RUNS		5
 
 static int
-- 
2.30.2