linux-kernel - Re: [PATCH v3 4/5] selftests/resctrl: Change the default limited time to 120 seconds

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Date:   Fri, 18 Feb 2022 13:32:24 -0700
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Shaopeng Tan <tan.shaopeng@...fujitsu.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Shuah Khan <shuah@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v3 4/5] selftests/resctrl: Change the default limited time
 to 120 seconds

On 2/15/22 7:26 PM, Shaopeng Tan wrote:
> When testing on a Intel(R) Xeon(R) Gold 6254 CPU @ 3.10GHz the resctrl
> selftests fail due to timeout after exceeding the default time limit of
> 45 seconds. On this system the test takes about 68 seconds.
> Since the failing test by default accesses a fixed size of memory, the
> execution time should not vary significantly between different environment.
> A new default of 120 seconds should be sufficient yet easy to customize
> with the introduction of the "settings" file for reference.
> 
> Signed-off-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>
> ---
>  From the perspective of the kselftest framework,
> a rule of "Don't take too long" is a concern.
> To get some better informed opinions from kselftest audience,
> I highlighted this change in the cover letter.
> 
> I adopted most of Reinette's phrase from the discussion in patch v2
> to explain why 120s is appropriate for this test.
> 
>   tools/testing/selftests/resctrl/settings | 1 +
>   1 file changed, 1 insertion(+)
>   create mode 100644 tools/testing/selftests/resctrl/settings
> 
> diff --git a/tools/testing/selftests/resctrl/settings b/tools/testing/selftests/resctrl/settings
> new file mode 100644
> index 000000000000..6091b45d226b
> --- /dev/null
> +++ b/tools/testing/selftests/resctrl/settings
> @@ -0,0 +1 @@
> +timeout=120
> 

This is fine.

Reviewed-by: Shuah Khan <skhan@...uxfoundation.org>

thanks,
-- Shuah