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Message-ID: <a5160a37-7778-49ff-8c25-92846d42e87e@intel.com>
Date: Thu, 2 Nov 2023 10:57:46 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
<linux-kselftest@...r.kernel.org>, Shuah Khan <shuah@...nel.org>,
"Shaopeng Tan" <tan.shaopeng@...fujitsu.com>,
Maciej Wieczór-Retman
<maciej.wieczor-retman@...el.com>,
Fenghua Yu <fenghua.yu@...el.com>
CC: <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 24/24] selftests/resctrl: Ignore failures from L2 CAT test
with <= 2 bits
Hi Ilpo,
On 10/24/2023 2:26 AM, Ilpo Järvinen wrote:
> L2 CAT test with low number of bits tends to occasionally fail because
> of what seems random variation. The margin is quite small to begin with
> for <= 2 bits in CBM. At times, the result can even become negative.
> While it would be possible to allow negative values for those cases, it
> would be more confusing to user.
>
> Ignore failures from the tests where <= 2 were used to avoid false
> negative results.
>
I think the core message is that 2 or fewer bits should not be used. Instead
of running the test and ignoring the results the test should perhaps just not
be run.
Reinette
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