Hello Stefan, folks, 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.
Bisect log:
git bisect start
# good: [aa222a8e4f975284b3f8f131653a4114b3d333b3] Merge tag 'for_upstream' of
https://git.kernel.org/pub/scm/virt/kvm/mst/qemu into staging
git bisect good aa222a8e4f975284b3f8f131653a4114b3d333b3
# bad: [ad3387396a71416cacc0b394e5e440dd6e9ba19a] Merge tag 'for-upstream' of
https://repo.or.cz/qemu/kevin into staging
git bisect bad ad3387396a71416cacc0b394e5e440dd6e9ba19a
# good: [71438d8dac07f28c01cf6d90fce14efe04c77824] graph-lock: Honour read
locks even in the main thread
git bisect good 71438d8dac07f28c01cf6d90fce14efe04c77824
# good: [4b424c757188f7a47630a4d8edcf4ad9f19255bc] scripts: make sure scripts
are invoked via $(PYTHON)
git bisect good 4b424c757188f7a47630a4d8edcf4ad9f19255bc
# bad: [80fc5d260002432628710f8b0c7cfc7d9b97bb9d] graph-lock: Disable locking
for now
git bisect bad 80fc5d260002432628710f8b0c7cfc7d9b97bb9d
# bad: [6d740fb01b9f0f5ea7a82f4d5e458d91940a19ee] aio-posix: do not nest poll
handlers
git bisect bad 6d740fb01b9f0f5ea7a82f4d5e458d91940a19ee
# good: [78935fcd88ec2d26d50e45043b262f0326e6d410] iotests/245: Check if
'compress' driver is available
git bisect good 78935fcd88ec2d26d50e45043b262f0326e6d410
# first bad commit: [6d740fb01b9f0f5ea7a82f4d5e458d91940a19ee] aio-posix: do
not nest poll handlers
Regards,
Lukáš
PS: The list of perf-ci issues is available here:
https://docs.google.com/spreadsheets/d/1HEXI5wDsNgAIgXl5MIhGond898Vz5A1Hrkl0lZmWEbg/edit#gid=0
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