[Bug 219049] ftruncate() slow on UFS+journaled softupdates
bugzilla-noreply at freebsd.org
bugzilla-noreply at freebsd.org
Fri Feb 23 03:36:43 UTC 2018
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219049
Alexander Motin <mav at FreeBSD.org> changed:
What |Removed |Added
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CC| |mav at FreeBSD.org
--- Comment #7 from Alexander Motin <mav at FreeBSD.org> ---
Could somebody experiencing the problem to look on the disk which was
originally reported as 100% busy during the test with `gstat -I 1s -pod`? It
would show distribution of I/O operations between reads, writes, deletes and
cache flushes, providing counts, sizes and average latency for which. It could
be a starting point is the problem is indeed disk-bound.
As I understand, journaled UFS may started to use cache flushes, not used
before, and I can theoretically guess some scenarios when some disks are not
handling it well.
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