[Bug 201331] deadlock (XFS?)

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=201331

--- Comment #10 from edo (edo.rus@gmail.com) ---
> A substripe write will require 4MiB + parity (which IIRC will be another 1024MiB) so a total of 5MiB needs to be Read, modified and written for each undersized write.

I'm pretty sure, md raid can do partial update for chunks.

I just ran 4Kib random write test (fio) on freshly created array with chunk
size 4Kib, after that with chunk size 16Mib - no difference in terms iops on
raid device (observed in fio), iops and transfer speed on raid members
(observed in iostat).


> Your system is not locked up, it's just really slow due the amount of time being spent waiting for IO completion.

No.
Array was filling with good speed (80-250Mib/s, limited by network) several
hours after system startup.
Unexpectedly write stopped (zeros in iostat) and messages "blocked for more
than 120 seconds" arrive. I managed to continue disk filling with hardware
reset only.
Such behavior repeated many times, I tried several kernel versions and kernel
options.

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