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Date:      Wed, 25 Apr 2007 20:13:37 -0400
From:      Kris Kennaway <kris@obsecurity.org>
To:        Axel Scheepers <ascheepers@nl.clara.net>
Cc:        freebsd-current@freebsd.org
Subject:   Re: zfs lor, panic
Message-ID:  <20070426001337.GA79168@xor.obsecurity.org>
In-Reply-To: <462FCE2B.50601@nl.clara.net>
References:  <462FCE2B.50601@nl.clara.net>

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On Wed, Apr 25, 2007 at 11:54:51PM +0200, Axel Scheepers wrote:
> Hello current list,
>=20
> I've just installed -current on my amd64(smp) workstation and tried zfs=
=20
> a bit. I've setup my ports and src dir as gzip compressed zfs mounts and=
=20
> used it without any problems. Then I moved my homedir to zfs, and all=20
> went fine for a while.. until.. I tried to use rtorrent on a zfs volume.=
=20
> Suddenly zfs would take all vm.kmem_size and eventually paniced as=20
> described on this list before. I've set it to 512MB in /boot/loader.conf=
=20
> and restricted the ARC to 64MB+1, this didn't panic but gave my a lock=20
> order reversal and a system which completely spents it's time in system=
=20
> time (according to top 100% with 640MB kmem) slowing it down to nearly a=
=20
> halt.

If you are concerned about performance then turn off the enormously
expensive debugging options like WITNESS ;)

This LOR has been reported before, BTW.

Kris

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