The issue with sync(2) being slow has been known for a while now (I can
find discussions as early as July 2010). But nobody seems to be willing
to fix it or even figure out out what the actual problem is. I use btrfs
on two hosts, and the sync(2) syscall is consistently slow. By slow I
mean 20 seconds on one and 45(!) seconds on the other. Every single
time, no exceptions.
Is there anything I can do to help track down the cause? I can test
patches, trace the kernel or use whatever tool is most helpful.
tom
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