freebsd stable - Feb 2019 - 11.2-STABLE kernel wired memory leak

13.02.2019 1:29, Kurt Jaeger wrote:
> On a 8 GB 11.2p8 box doing mostly routing:
> 
>   42.3047 abd_chunk
>         40 zio_buf_131072
>      31.75 zio_data_buf_131072
>    19.8901 swblk
>    12.9224 RADIX NODE
>    11.7344 zio_buf_16384
>    10.0664 zio_data_buf_12288
>    9.84375 zio_data_buf_40960
>      9.375 zio_data_buf_81920
>    7.96875 zio_data_buf_98304
> 
> So, how do I understand this ? Please note that I use:
> 
> 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.

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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