Date: Mon, 15 Nov 2010 21:50:50 +0100 From: Christer Solskogen <christer.solskogen@gmail.com> To: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: "High" cpu usage when using ZFS cache device Message-ID: <AANLkTinzwyhABYxzWknzRFzLCbcDSd3BU2kQ5tX_SSk-@mail.gmail.com>
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My load on my i7 920 is certainly higher when I add a 8GB usb stick as
a ZFS cache device.
It seems to use about 10% system load - If I remove the cache device
it drops about 10%. Anyone else seeing this?
With cache device:
CPU: 0.0% user, 0.0% nice, 10.3% system, 0.0% interrupt, 91.5% idle
Mem: 822M Active, 9101M Inact, 1542M Wired, 34M Cache, 1237M Buf, 375M Free
Swap: 8192M Total, 200K Used, 8192M Free
Without:
up 56+01:04:25 21:50:01
137 processes: 1 running, 136 sleeping
CPU: 0.1% user, 0.0% nice, 0.0% system, 0.0% interrupt, 99.9% idle
Mem: 822M Active, 9101M Inact, 1542M Wired, 34M Cache, 1237M Buf, 375M Free
The load reported by top is +0.50 with, and +0.00 without.
FreeBSD 8.1-RELEASE amd64
--
chs,
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