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SubjectRe: [PATCH v4 2/2] sched/fair: Scan cluster before scanning LLC in wake-up path
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On Fri, 2022-06-10 at 14:39 +0800, Yicong Yang wrote:
>
>
> I've tested this patch with MySQL as well (like in v2). This won't hurt
> the MySQL case with SIS_PROP but observed some improvement with SIS_UTIL
> posted in [1]. We leverage the nr to suppress redundant scanning in the
> current approach and seems SIS_UTIL is more efficient in this case.
>
> 5.19-rc1 patched patched+SIS_UTIL[1]
> TPS-16threads 6215.11 6172.74 (-0.68%) 6217.33 (0.04%)
> QPS-16threads 124302.21 123454.68 (-0.68%) 124346.52 (0.04%)
> avg-lat-16threads 2.57 2.59 (-0.65%) 2.57 (0.00%)
> TPS-24threads 8726.40 8690.87 (-0.41%) 8833.08 (1.22%)
> QPS-24threads 174527.88 173817.42 (-0.41%) 176661.54 (1.21%)
> avg-lat-24threads 2.75 2.76 (-0.36%) 2.71 (1.33%)
> TPS-32threads 9555.42 9514.86 (-0.42%) 10010.87 (4.77%)
> QPS-32threads 191108.37 190297.28 (-0.42%) 200217.35 (4.55%)
> avg-lat-32threads 3.35 3.36 (-0.30%) 3.20 (4.58%)
> TPS-64threads 10290.10 10324.75 (0.34%) 10819.77 (5.15%)
> QPS-64threads 205802.05 206494.95 (0.34%) 216395.40 (4.90%)
> avg-lat-64threads 6.22 6.20 (0.38%) 5.92 (4.88%)
>

Thanks for the numbers. SIS_UTIL will keep off migrations off the cluster
that doesn't really improve overall utilization. We have higher chance that
L2 cache is warm. So it makes sense that we see a bit
better performance there.

Tim


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