slow ZFS on FreeBSD 8.1
peterjeremy at acm.org
Sat Jan 1 00:00:31 UTC 2011
On 2010-Dec-30 02:31:30 -0500, Adam Stylinski <kungfujesus06 at gmail.com> wrote:
>I can tell you what the problem is right now, actually. ZFS performs
>very poorly on low performance CPUs (i.e. your Atom N330).
I would disagree. In this case, the op's most serious problem is a
which is leading to ARC starvation. The direct effect of this is very
poor ZFS I/O performance. It can be identified by very high "inactive"
and possibly "cache" memory (as reported by 'systat -v' or top) as well
as very high kstat.zfs.misc.arcstats.memory_throttle_count
This bug was fixed in r210427 on -current, r211599 on 8.x and
r211623 on 7.x.
> Try the
>same system with a different CPU and you'll get a different result.
Not until the above bug is fixed.
That said, ZFS is far more CPU intensive than UFS and a more powerful
CPU may help - especially if you want gzip compression and/or sha256
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