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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