ZFS performance help sought

[Jov]

sys% 62.6 is wired，what ie your disk type？please post the output of iostat
-x 1
2016年1月22日 7:56 AM，"Mason Loring Bliss" <mason at blisses.org>写道：

> On Thu, Jan 21, 2016 at 06:28:10PM -0500, Mason Loring Bliss wrote:
>
> > All that said, I wasn't setting write_limit_override, so I'm trying
> that, and
> > I'm cutting the txg.timeout back a couple seconds more.
>
> Well, that didn't help. System's still really choppy.
>
> last pid:  1707;  load averages:  9.20,  4.75,  2.14    up 0+00:09:35
> 18:53:03
> 55 processes:  1 running, 54 sleeping
> CPU:  2.1% user,  0.0% nice, 62.6% system,  0.5% interrupt, 34.8% idle
> Mem: 323M Active, 331M Inact, 4589M Wired, 8928K Cache, 2677M Free
> ARC: 4096M Total, 916M MFU, 2303M MRU, 845M Anon, 17M Header, 15M Other
> Swap: 8192M Total, 8192M Free
>
>   PID USERNAME    THR PRI NICE   SIZE    RES STATE   C   TIME    WCPU
> COMMAND
>  1501 root          1  33    0 42248K  3616K dmu_tx  1   0:10   5.76% zfs
>  1500 root          1  24    0 42248K  3768K pipewr  0   0:08   5.18% zfs
>
> Here's what I set:
>
> vfs.zfs.arc_max="4096M"
> vfs.zfs.arc_min="1024M"
> vfs.zfs.txg.timeout="3"
> vfs.zfs.write_limit_override="512M"
>
> I'm not seeing any obvious way to verify the write_limit_override setting -
> it appears not to show up in sysctl output.
>
> I'll wait for the current big transfer to finish and then I'll try it with
> prefetch disabled too.
>
> --
> Mason Loring Bliss          mason at blisses.org          Ewige Blumenkraft!
> awake ? sleep : random() & 2 ? dream : sleep; -- Hamlet, Act III, Scene I
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