ARC "pressured out", how to control/stabilize ? (reformatted to text/plain)
Andriy Gapon
avg at FreeBSD.org
Thu Jan 30 11:16:32 UTC 2014
on 28/01/2014 11:28 Vladimir Sharun said the following:
> Dear Andriy and FreeBSD community,
>
> After applying this path one of the systems runs fine (disk subsystem load low to moderate
> - 10-20% busy sustained),
>
> Then I saw this patch was merged to the HEAD and we apply it to the one of the systems
> with moderate to high disk load: 30-60% busy (11.0-CURRENT #7 r261118: Fri Jan 24 17:25:08 EET 2014)
>
> Within 4 days we experiencing the same leak(?) as without patch:
>
> last pid: 53841; load averages: 4.47, 4.18, 3.78 up 3+16:37:09 11:24:39
> 543 processes: 6 running, 537 sleeping
> CPU: 8.7% user, 0.0% nice, 14.6% system, 1.4% interrupt, 75.3% idle
> Mem: 22G Active, 1045M Inact, 98G Wired, 1288M Cache, 3284M Buf, 2246M Free
> ARC: 73G Total, 3763M MFU, 62G MRU, 56M Anon, 1887M Header, 4969M Other
> Swap:
>
> The ARC is populated within 30mins under load to the max (90Gb) then start decreasing.
>
> The delta between Wiread and ARC total start growing from typical 10-12Gb without L2 enabled
> to the 25Gb with L2 enabled and counting (4 hours ago was 22Gb delta).
First, have you checked that vmstat -z output contains the same anomaly as for
in your original report?
If yes, the please try to reproduce the problem with the following debugging patch:
http://people.freebsd.org/~avg/l2arc-b_tmp_cdata-diag.patch
Please make sure to compile your kernel (and modules) with INVARIANTS.
--
Andriy Gapon
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