This is a note to let you know that I've just added the patch titled
selftests/resctrl: Reduce failures due to outliers in MBA/MBM tests
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
selftests-resctrl-reduce-failures-due-to-outliers-in-mba-mbm-tests.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ef43c30858754d99373a63dff33280a9969b49bc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Date: Mon, 2 Oct 2023 12:48:13 +0300
Subject: selftests/resctrl: Reduce failures due to outliers in MBA/MBM tests
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From: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
commit ef43c30858754d99373a63dff33280a9969b49bc upstream.
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.
Fixed commit description style error during merge:
Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
Fixes: 06bd03a57f8c ("selftests/resctrl: Fix MBA/MBM results reporting format")
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Tested-by: Shaopeng Tan <tan.shaopeng@xxxxxxxxxxxxxx>
Reviewed-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>
Reviewed-by: Shaopeng Tan <tan.shaopeng@xxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/resctrl/mba_test.c | 2 +-
tools/testing/selftests/resctrl/mbm_test.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
--- 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
--- 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
Patches currently in stable-queue which might be from ilpo.jarvinen@xxxxxxxxxxxxxxx are
queue-5.15/platform-x86-thinkpad_acpi-add-battery-quirk-for-thi.patch
queue-5.15/selftests-resctrl-reduce-failures-due-to-outliers-in-mba-mbm-tests.patch
queue-5.15/media-cobalt-use-field_get-to-extract-link-width.patch
queue-5.15/pci-use-field_get-in-sapphire-rx-5600-xt-pulse-quirk.patch
queue-5.15/pci-tegra194-use-field_get-field_prep-with-link-widt.patch
queue-5.15/atm-iphase-do-pci-error-checks-on-own-line.patch
queue-5.15/pci-use-field_get-to-extract-link-width.patch
queue-5.15/rdma-hfi1-use-field_get-to-extract-link-width.patch
queue-5.15/selftests-resctrl-remove-duplicate-feature-check-from-cmt-test.patch
