11.2-STABLE kernel wired memory leak
lev at FreeBSD.org
Tue Feb 12 21:02:17 UTC 2019
Tuesday, February 12, 2019, 10:18:09 PM, you wrote:
>> I'm have same problem.
>> According to top(1) I have 29G Wired, but only 17G Total ARC (12G
>> difference! System has 32G of RAM), and this statistic shows:
>> 5487.5 zio_data_buf_524288
>> 920.125 zio_data_buf_131072
>> 626 zio_buf_131072
>> 468 zio_data_buf_1048576
>> 398.391 zio_buf_16384
>> 305.464 dnode_t
>> 227.989 zio_buf_512
>> 171.5 zio_data_buf_458752
>> 141.75 zio_data_buf_393216
>> 116.456 dmu_buf_impl_t
>> So, more than 6G (!) is not used in ARC, but hold by ZFS anyway.
> dnode_t and dmu_buf_impl_t are parts of ZFS too,
> so these numbers represent about 9G, not 6G.
> Do you have/had some memory pressure here? Growth of swap usage?
I don't have memory pressure right now, but according to my previous
experience, ARC will not grow anymore even under heavy disk load (I don't
have vfs.zfs.arc_max set).
Before new ARC (vfs.zfs.abd_scatter_enabled) I had typically ALL
memory occuped by ARC, Wired memory was almost exactly equal to ARC, and
ARC hitrate was higher (but I have not exact numbers, unfortunately).
Now I have "vfs.zfs.abd_scatter_enabled=0", but still Wired is much larger
that ARC under any disk load (it is mostly torrent box).
Lev mailto:lev at FreeBSD.org
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