Hello list,
i wanted to try out ceph with latest vanilla kernel 3.7-rc5. I was
seeing a massive performance degration. I see around 22x
btrfs-endio-write processes every 10-20 seconds and they run a long time
while consuming a massive amount of CPU.
So my performance of 23.000 iops drops to an up and down of 23.000 iops
to 0 - avg is now 2500 iops instead of 23.000.
Git bisect shows me commit: e209db7ace281ca347b1ac699bf1fb222eac03fe
"Btrfs: set journal_info in async trans commit worker" as the
problematic patch.
When i revert this one everything is fine again.
Is this known?
Greets,
Stefan
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