[Bug 195746] zfs L2ARC wrong alloc/free size

[Steven Hartland]

There is a know upstream issue regarding L2ARC accounting see:
https://reviews.csiden.org/r/175/

On 13/04/2015 15:58, bugzilla-noreply at freebsd.org wrote:
> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195746
>
> gkontos at aicom.gr changed:
>
>             What    |Removed                     |Added
> ----------------------------------------------------------------------------
>                   CC|                            |gkontos at aicom.gr
>
> --- Comment #2 from gkontos at aicom.gr ---
> I have exactly the same problem with 2X Intel DC S3500 Series 600GB
>
> ------------------------------------------------------------------------
> ZFS Subsystem Report                Mon Apr 13 10:56:52 2015
> ------------------------------------------------------------------------
>
> L2 ARC Summary: (DEGRADED)
>      Passed Headroom:            69.29m
>      Tried Lock Failures:            316.43k
>      IO In Progress:                86
>      Low Memory Aborts:            648
>      Free on Write:                1.01m
>      Writes While Full:            202.57k
>      R/W Clashes:                1.32k
>      Bad Checksums:                17.34m
>      IO Errors:                3.23m
>      SPA Mismatch:                49.06m
>
> L2 ARC Size: (Adaptive)                3.21    TiB
>      Header Size:            0.19%    6.21    GiB
>
> L2 ARC Evicts:
>      Lock Retries:                146
>      Upon Reading:                0
>
> L2 ARC Breakdown:                103.52m
>      Hit Ratio:            34.77%    35.99m
>      Miss Ratio:            65.23%    67.53m
>      Feeds:                    1.28m
>
> L2 ARC Buffer:
>      Bytes Scanned:                116.31    TiB
>      Buffer Iterations:            1.28m
>      List Iterations:            78.60m
>      NULL List Iterations:            2.68m
>
> L2 ARC Writes:
>      Writes Sent:            100.00%    620.76k
> ------------------------------------------------------------------------
>
>
>      NAME                  STATE     READ WRITE CKSUM
>      storage               ONLINE       0     0     0
>        raidz2-0            ONLINE       0     0     0
>          multipath/disk1   ONLINE       0     0     0
>          multipath/disk2   ONLINE       0     0     0
>          multipath/disk25  ONLINE       0     0     0
>          multipath/disk4   ONLINE       0     0     0
>          multipath/disk5   ONLINE       0     0     0
>          multipath/disk6   ONLINE       0     0     0
>        raidz2-1            ONLINE       0     0     0
>          multipath/disk7   ONLINE       0     0     0
>          multipath/disk8   ONLINE       0     0     0
>          multipath/disk9   ONLINE       0     0     0
>          multipath/disk26  ONLINE       0     0     0
>          multipath/disk11  ONLINE       0     0     0
>          multipath/disk12  ONLINE       0     0     0
>        raidz2-2            ONLINE       0     0     0
>          multipath/disk13  ONLINE       0     0     0
>          multipath/disk14  ONLINE       0     0     0
>          multipath/disk15  ONLINE       0     0     0
>          multipath/disk16  ONLINE       0     0     0
>          multipath/disk17  ONLINE       0     0     0
>          multipath/disk18  ONLINE       0     0     0
>        raidz2-3            ONLINE       0     0     0
>          multipath/disk19  ONLINE       0     0     0
>          multipath/disk20  ONLINE       0     0     0
>          multipath/disk21  ONLINE       0     0     0
>          multipath/disk22  ONLINE       0     0     0
>          multipath/disk23  ONLINE       0     0     0
>          multipath/disk24  ONLINE       0     0     0
>      logs
>        mirror-4            ONLINE       0     0     0
>          gpt/zil0          ONLINE       0     0     0
>          gpt/zil1          ONLINE       0     0     0
>      cache
>        gpt/cache0          ONLINE       0     0     0
>        gpt/cache1          ONLINE       0     0     0
>      spares
>        multipath/disk3     AVAIL
>        multipath/disk27    AVAIL
>        multipath/disk28    AVAIL
>        multipath/disk10    AVAIL
>