ZFS performance help sought
Mason Loring Bliss
mason at blisses.org
Thu Jan 21 23:55:52 UTC 2016
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:
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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