Dne 25. 05. 23 v 17:21 Stefan Hajnoczi napsal(a): > On Thu, 25 May 2023 at 06:18, Lukáš Doktor <ldok...@redhat.com> wrote: >> the perf-ci detected and bisected the 6d740fb - aio-posix: do not nest poll >> handlers - as a performance improvement when using multiple concurrent jobs >> and 4k (22%) as well as 1024k (63%) blocks on aarch64 (on a slow rotational >> disk). >> >> >> https://ldoktor.github.io/tmp/RedHat-virtlab-arm09/v8.0.0/150-improvement.html >> >> Based on the commit message I guess it's expected so take this just as a >> record of an improvement. > > The commit was not intended to change performance and I'm not sure why > it happens! >
It had and today the x86_64 pipeline finished which shows similar improvement just not in read but rather in write instead and only for 4k blocks (~40%). For 1024k blocks I can see it scoring a bit better (~1.5%). Reads are too jittery to really tell anything on that machine. Anyway I have not done any thorough testing, just a bisection with the most significant setting. From around the same time I can see a NVMe regression in 4k writes, but first bisection job showed nothing. I'll increase the range and try again as each job since that day shows similar drop. Regards, Lukáš > Thanks for letting me know. > > Stefan >
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