zfs kernel panic
Pawel Jakub Dawidek
pjd at FreeBSD.org
Wed Sep 9 10:44:02 UTC 2009
On Wed, Sep 09, 2009 at 07:41:08PM +1000, Danny Carroll wrote:
> On 9/09/2009 6:33 PM, Pawel Jakub Dawidek wrote:
> >On Wed, Sep 09, 2009 at 09:07:15AM +0200, Gerrit Kühn wrote:
> >>On Tue, 8 Sep 2009 18:44:13 +0200 Pawel Jakub Dawidek<pjd at FreeBSD.org>
> >>wrote about Re: zfs kernel panic:
> >>PJD> If this is amd64, add vm.kmem_size="4G" to your loader.conf back.
> >>What about vm.kmem_size_max? Does that also need tuning?
> >No, this should be auto-tuned to some very large value.
> Pawel (et al),
> Would it be possible for you to post to the list your ideas of a
> complete set of tuning parameters for ZFS on amd64? I have used the
> wiki article as a reference (http://wiki.freebsd.org/ZFSTuningGuide) but
> it states that if you have > 2g ram and 7.2 then you do not need to tune
> at all.
I think that was the idea, although I see no reason to have less kernel
address space than physical memory (except there might be other
in-kernel variables auto-tuned based on kmem size).
> I for one would be interested in learning a little more about how the
> memory should be tuned. Specifically what might be interesting is to
> know, once a parameter is set, is there an easy way to find out how it's
> being used? i.e. If you start limiting the arc, is is possible to know
> what sort of hit/miss rate you are getting.
There are ARC statistics available here:
# sysctl kstat.zfs
Pawel Jakub Dawidek http://www.wheel.pl
pjd at FreeBSD.org http://www.FreeBSD.org
FreeBSD committer Am I Evil? Yes, I Am!
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