11.2-STABLE kernel wired memory leak

Lev Serebryakov lev at FreeBSD.org
Tue Feb 12 18:50:45 UTC 2019

On 12.02.2019 21:37, Eugene Grosbein wrote:

>> vfs.zfs.arc_max=1216348160
> Each line shows how many megabytes is allocated but currently unused by corresponding
> UMA zone (and unavailable for other consumers). Your numbers are pretty low,
> you have nothing to worry about IMHO. I have hundreds of megabytes and gigabytes there.
 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.

// Lev Serebryakov

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