linux-kernel - Re: IBS perf test failures on 9950x3d

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Message-ID: <33e86415-c90d-420a-b7a8-6a360769aea4@amd.com>
Date: Sat, 17 May 2025 17:33:19 +0530
From: Ravi Bangoria <ravi.bangoria@....com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>, Ian Rogers <irogers@...gle.com>,
 James Clark <james.clark@...aro.org>, Jiri Olsa <jolsa@...nel.org>,
 Kan Liang <kan.liang@...ux.intel.com>, Namhyung Kim <namhyung@...nel.org>,
 Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
 "linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>,
 Ravi Bangoria <ravi.bangoria@....com>
Subject: Re: IBS perf test failures on 9950x3d

Hi Arnaldo,

> If it needs a specific kernel, then the test needs to cope with that,
> etc.

1) Bunch of IBS kernel fixes went in recently (v6.15-rc1):

   https://lore.kernel.org/r/20250115054438.1021-1-ravi.bangoria@amd.com

   Since you are running on 6.14.5-300.fc42.x86_64, the failures are
   genuine and indicating that kernel should be fixed.

   I'm wondering how would the test cope with the buggy kernel. Or
   probably 'perf test' a wrong place to put such selftests?

2) "mprotect() failed. Permission denied" seems to be because of
   SELinux enforced mode? I'll prepare and post a fix but, even
   with the error, it's just part of the dummy workload function
   so wouldn't break any test functionality.

Thanks,
Ravi