On Fri, 26 May 2023 at 04:07, Lukáš Doktor <ldok...@redhat.com> wrote: > > 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.
Thanks! Stefan
