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List: linux-kernel
Subject: Re: [PATCH 00/30] PREEMPT_AUTO: support lazy rescheduling
From: Raghavendra K T <raghavendra.kt () amd ! com>
Date: 2024-02-22 13:16:33
Message-ID: af122806-8325-4302-991f-9c0dc1857bfe () amd ! com
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On 2/21/2024 10:45 PM, Thomas Gleixner wrote:
> On Wed, Feb 21 2024 at 17:53, Raghavendra K T wrote:
>> Configuration tested.
>> a) Base kernel (6.7),
>
> Which scheduling model is the baseline using?
>
>> b) patched with PREEMPT_AUTO voluntary preemption.
>> c) patched with PREEMPT_DYNAMIC voluntary preemption.
>>
>> Workloads I tested and their %gain,
>> case b case c
>> NAS +2.7 +1.9
>> Hashjoin, +0 +0
>> XSBench +1.7 +0
>> Graph500, -6 +0
>
> The Graph500 stands out. Needs some analysis.
>
Hello Thomas, Ankur,
Because of high stdev I saw with the runs for Graph500, continued to
take results with more iterations.
Here is the result. It does not look like there is a concern here.
(you can see the *min* side of preempt-auto case which could have got
the negative result in the analysis, But I should have posted stdev
along with that. Sorry for not being louder there.).
Overall this looks good. some time better but all within noise level.
Benchmark = Graph500
x 6.7.0+
+ 6.7.0-preempt-auto+
N Min Max Median Avg Stddev
x 15 6.7165689e+09 7.7607743e+09 7.2213638e+09 7.2759563e+09 3.3353312e+08
+ 15 6.4856432e+09 7.942607e+09 7.3115082e+09 7.3386124e+09 4.6474773e+08
No difference proven at 80.0% confidence
No difference proven at 95.0% confidence
No difference proven at 99.0% confidence
Thanks and Regards
- Raghu
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