linux-kernel - Re: [PATCH 24/24] selftests/resctrl: Ignore failures from L2 CAT test with <= 2 bits

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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