Poor ZFS performance
mel.flynn+fbsd.questions at mailing.thruhere.net
Tue May 5 18:25:39 UTC 2009
On Monday 04 May 2009 02:07:41 nf wrote:
> On Sat, May 2, 2009 at 7:22 PM, Frederique Rijsdijk
> <frederique at isafeelin.org> wrote:
> > nf wrote:
> >> 733843456 bytes transferred in 61.124812 secs (12005656 bytes/sec)
> > That is very low. I get about 60MB/sec in this way. Adding bs=1m it'll go
> > up to 240MB/sec even (raidz1 with 4*1TB).
> > Could you show top -S ?
> I will, the next time I experience the issue.
> I had already rebooted the box, which immediately alleviated the
> issue. I can only presume, at this point, that it seems to have been
> related to the 2gb of allocated/active memory shown by top. I had no
> memory intensive apps running, merely an idle lighttpd, mysqld, and
> rtorrent (which only occupied about 90mb).
There's a thread or 2 on -current list about ZFS arc cache growth, that you
may or may not be seeing as well.
More information about the freebsd-questions