linux-kernel - Re: Benchmarking [PATCH v5 00/14] SLUB percpu sheaves

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Message-ID: <qs3967pq-4nq7-67pq-2025-r7259o0s52p4@vanv.qr>
Date: Mon, 15 Sep 2025 09:51:25 +0200 (CEST)
From: Jan Engelhardt <ej@...i.de>
To: Sudarsan Mahendran <sudarsanm@...gle.com>
cc: vbabka@...e.cz, Liam.Howlett@...cle.com, cl@...two.org, 
    harry.yoo@...cle.com, howlett@...il.com, linux-kernel@...r.kernel.org, 
    linux-mm@...ck.org, maple-tree@...ts.infradead.org, rcu@...r.kernel.org, 
    rientjes@...gle.com, roman.gushchin@...ux.dev, surenb@...gle.com, 
    urezki@...il.com
Subject: Re: Benchmarking [PATCH v5 00/14] SLUB percpu sheaves


On Saturday 2025-09-13 02:09, Sudarsan Mahendran wrote:
>
>Summary of the results:
>
>- Significant change (meaning >10% difference
>  between base and experiment) on will-it-scale
>  tests in AMD.
>
>Summary of AMD will-it-scale test changes:
>
>Number of runs : 15
>Direction      : + is good

If STDDEV grows more than mean, there is more jitter,
which is not "good".

>|            | MIN        | MAX        | MEAN       | MEDIAN     | STDDEV     |
>|:-----------|:-----------|:-----------|:-----------|:-----------|:-----------|
>| brk1_8_processes
>| BASE       | 7,667,220  | 7,705,767  | 7,682,782  | 7,676,211  | 12,733     |
>| TEST       | 9,477,395  | 10,053,058 | 9,878,753  | 9,959,360  | 182,014    |
>| %          | +23.61%    | +30.46%    | +28.58%    | +29.74%    | +1,329.46% |
>
>| mmap2_256_processes
>| BASE       | 7,483,929  | 7,532,461  | 7,491,876  | 7,489,398  | 11,134     |
>| TEST       | 11,580,023 | 16,508,551 | 15,337,145 | 15,943,608 | 1,489,489  |
>| %          | +54.73%    | +119.17%   | +104.72%   | +112.88%   | +13,276.75%|