Freebsd8.1 ZFS with mfi driver performance

[Pawel Jakub Dawidek]

On Thu, Jan 20, 2011 at 09:57:33PM +0800, jackie wang wrote:
> more /boot/loader.conf
> 
> VS001# more /boot/loader.conf
> zfs_load="YES"
> vfs.root.mountfrom="zfs:zroot"
> geom_mirror_load="YES"
> #vm.kmem_size="4096M"
> #vm.kmem_size_max="3072M"

Why you commented those out? Try adding:

vm.kmem_size="4096M"

> vfs.zfs.arc_min="1024M"
> vfs.zfs.arc_max="4096M"
> #vfs.zfs.vdev.cache.size="5M"
> vfs.zfs.vdev.min_pending="1"
> vfs.zfs.vdev.max_pending="1"
> vfs.zfs.prefetch_disable="1"
> vfs.zfs.txg.timeout="5"
> vfs.zfs.txg.synctime="1"
> vfs.zfs.txg.write_limit_override="524288000"
> 
> when the system slow there much mermory in wired status about 5GB, and
> the system begin to use swap.
> 
> So,my question is why the zfs slow . Please Help ,now the box is in
> production env.

Could you explain all your settings there? I'd start from removing all
of them and just leaving kmem_size.

-- 
Pawel Jakub Dawidek                       http://www.wheelsystems.com
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
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