Message-ID: <20250913000935.1021068-1-sudarsanm@google.com>
Date: Fri, 12 Sep 2025 17:09:35 -0700
From: Sudarsan Mahendran <sudarsanm@...gle.com>
To: vbabka@...e.cz
Cc: 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

Hi Vlastimil,

I ported this patch series on top of v6.17 and ran
some benchmarks: will-it-scale, hackbench, redis,
unixbench and kernbench. I ran the benchmarks
on Intel Granite Rapids (480 cores), AMD Turin (512 cores)
and ARM (80 cores)

Summary of the results:

- Significant change (meaning >10% difference
  between base and experiment) on will-it-scale
  tests in AMD.
- No significant change on other benchmarks ran.

Summary of AMD will-it-scale test changes:

Number of runs : 15
Direction      : + is 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% |
| brk1_8_threads
| BASE       | 1,838,468  | 1,890,873  | 1,864,473  | 1,864,875  | 18,406     |
| TEST       | 1,464,917  | 1,668,207  | 1,608,345  | 1,654,578  | 70,558     |
| %          | -20.32%    | -11.78%    | -13.74%    | -11.28%    | +283.34%   |
| brk1_128_processes
| BASE       | 65,018,211 | 65,603,366 | 65,285,348 | 65,103,197 | 232,885    |
| TEST       | 51,287,801 | 52,161,228 | 51,647,807 | 51,509,505 | 277,326    |
| %          | -21.12%    | -20.49%    | -20.89%    | -20.88%    | +19.08%    |
| brk1_256_processes
| BASE       | 15,186,881 | 15,239,120 | 15,210,265 | 15,205,809 | 15,850     |
| TEST       | 20,478,924 | 23,936,204 | 22,754,698 | 22,771,320 | 1,255,974  |
| %          | +34.85%    | +57.07%    | +49.60%    | +49.75%    | +7,823.72% |
| brk1_384_processes
| BASE       | 11,587,076 | 11,851,775 | 11,765,869 | 11,806,007 | 73,736     |
| TEST       | 25,464,757 | 29,176,818 | 26,695,946 | 26,563,116 | 1,012,563  |
| %          | +119.77%   | +146.18%   | +126.89%   | +125.00%   | +1,273.23% |
| brk1_512_processes
| BASE       | 14,410,293 | 14,891,082 | 14,775,209 | 14,793,142 | 114,384    |
| TEST       | 22,918,195 | 29,648,177 | 25,204,321 | 25,128,471 | 1,604,037  |
| %          | +59.04%    | +99.10%    | +70.59%    | +69.87%    | +1,302.32% |
| mmap1_8_processes
| BASE       | 3,164,411  | 3,170,585  | 3,167,590  | 3,167,692  | 2,436      |
| TEST       | 3,516,242  | 3,756,209  | 3,684,585  | 3,698,731  | 68,659     |
| %          | +11.12%    | +18.47%    | +16.32%    | +16.76%    | +2,718.28% |
| mmap1_8_threads
| BASE       | 627,817    | 632,702    | 630,554    | 629,281    | 1,764      |
| TEST       | 541,202    | 554,097    | 549,104    | 549,896    | 4,257      |
| %          | -13.80%    | -12.42%    | -12.92%    | -12.62%    | +141.34%   |
| mmap1_128_processes
| BASE       | 30,303,429 | 30,736,686 | 30,466,107 | 30,343,821 | 174,985    |
| TEST       | 9,749,426  | 9,893,331  | 9,823,701  | 9,857,157  | 52,125     |
| %          | -67.83%    | -67.81%    | -67.76%    | -67.52%    | -70.21%    |
| mmap1_256_processes
| BASE       | 7,496,765  | 7,546,703  | 7,528,379  | 7,543,246  | 21,465     |
| TEST       | 10,868,119 | 16,947,857 | 12,695,418 | 11,608,083 | 2,157,787  |
| %          | +44.97%    | +124.57%   | +68.63%    | +53.89%    | +9,952.34% |
| mmap1_384_processes
| BASE       | 5,629,206  | 5,856,927  | 5,758,347  | 5,733,892  | 85,930     |
| TEST       | 12,053,514 | 13,635,555 | 12,966,975 | 13,283,450 | 606,325    |
| %          | +114.12%   | +135.49%   | +112.89%   | +104.26%   | +2,855.57% |
| mmap1_512_processes
| BASE       | 6,959,199  | 6,996,383  | 6,975,912  | 6,974,353  | 15,446     |
| TEST       | 10,197,814 | 12,029,690 | 11,458,180 | 11,381,726 | 534,690    |
| %          | +46.54%    | +71.94%    | +64.25%    | +63.19%    | +3,361.67% |
| tlb_flush2_384_threads
| BASE       | 2,953,477  | 3,021,464  | 3,003,512  | 3,014,264  | 25,525     |
| TEST       | 2,231,417  | 2,526,876  | 2,408,368  | 2,411,121  | 115,773    |
| %          | -24.45%    | -16.37%    | -19.81%    | -20.01%    | +353.55%   |
| tlb_flush2_512_threads
| BASE       | 2,499,486  | 2,542,966  | 2,520,278  | 2,530,049  | 17,161     |
| TEST       | 1,707,641  | 1,714,524  | 1,708,951  | 1,707,713  | 1,877      |
| %          | -31.68%    | -32.58%    | -32.19%    | -32.50%    | -89.06%    |
| mmap2_128_processes
| BASE       | 29,754,984 | 30,313,146 | 30,010,106 | 29,897,731 | 218,812    |
| TEST       | 9,688,640  | 9,750,688  | 9,710,137  | 9,696,830  | 23,428     |
| %          | -67.44%    | -67.83%    | -67.64%    | -67.57%    | -89.29%    |
| 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%|
| mmap2_384_processes
| BASE       | 5,725,503  | 5,826,364  | 5,763,341  | 5,765,247  | 29,674     |
| TEST       | 11,682,353 | 13,720,566 | 12,269,665 | 11,776,228 | 877,060    |
| %          | +104.04%   | +135.49%   | +112.89%   | +104.26%   | +2,855.57% |
| mmap2_512_processes
| BASE       | 6,959,199  | 6,996,383  | 6,975,912  | 6,974,353  | 15,446     |
| TEST       | 10,197,814 | 12,029,690 | 11,458,180 | 11,381,726 | 534,690    |
| %          | +46.54%    | +71.94%    | +64.25%    | +63.19%    | +3,361.67% |

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