Am 25.06.2012 20:02, schrieb Josef Bacik:
> Can you turn that off and see if you
can still reproduce the deadlock? If so sysrq+w again, if not then I know where
to look ;). Thanks,
without discard i can't reproduce but random write speed with ceph
without discard is a LOT slower (around 8000 iops/s instead of
13000iops/s). So i don't know if it is discard or if i'm just not able
to trigger it.
Ouch, what kind of drive goes faster with discard _on_? Anyway it looks like
we're waiting for the discard to come back, so either its your drive or theres a
bug in the block layer. Maybe try an older kernel and see if it's broken there,
and then bisect it down? Thanks,
Intel 520 series SSD. I can't try an older kernel version as ceph
crashes with them pretty fast due to other bugs which where fixed with
3.5-rc1.
Greets
Stefan
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