Date: Wed, 20 Jun 2007 16:16:56 -0400
From: John Nielsen <lists@jnielsen.net>
To: Dan Mack <mack@macktronics.com>
Cc: freebsd-current@freebsd.org
Subject: Re: ZFS and deadlock with {nullfs,NFS}
Message-ID: <200706201616.56547.lists@jnielsen.net>
In-Reply-To: <20070620145130.K71819@coco.macktronics.com>
References: <1182354823.6504.23.camel@shumai.marcuscom.com> <200706201528.31349.lists@jnielsen.net> <20070620145130.K71819@coco.macktronics.com>
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On Wednesday 20 June 2007 03:56:13 pm Dan Mack wrote: > On Wed, 20 Jun 2007, John Nielsen wrote: > > On Wednesday 20 June 2007 12:30:23 pm Dan Mack wrote: > >> On Wed, 20 Jun 2007, Kris Kennaway wrote: > >> > >> <snip> > >> > >>> 404 at the moment, but look for processes involving zil* in the > >>> backtrace. I had to disable zil (vfs.zfs.zil_disable=1 tunable) to > >>> prevent low-memory deadlocks on my machines. Since then it's been > >>> fine. > >>> > >>> You may also wish to use my patches (see the archives) to improve > >>> performance and low-memory behaviour. > >>> > >>> Kris > >> > >> Does someone have these recommended sysctls embodied in an example > >> /boot/loader.conf yet? Here is mine, does it look reasonable to keep > >> ZFS from running into the kmem_ memory panics? I have no idea if I > >> found all of your recommendations so it would be nice if they were > >> summarized in one place. > >> > >> | # /boot/loader.conf i386 / 1GB memory / SMP > >> | kern.maxvnodes="50000" > > > > Note that kern.maxvnodes has to be set in /etc/sysctl.conf to have any > > effect. > > > > JN > > FWIW ... I'm still experiencing panics; this time with when running cvsup > to update /usr/ports: > > borg# grep -i Panic /var/crash/info* > /var/crash/info.0: Panic String: kmem_malloc(16384): kmem_map too small: > 268419072 total allocated /var/crash/info.1: Panic String: > kmem_malloc(131072): kmem_map too small: 266354688 total allocated > /var/crash/info.2: Panic String: kmem_malloc(4096): kmem_map too small: > 268435456 total allocated /var/crash/info.3: Panic String: > kmem_malloc(28672): kmem_map too small: 268435456 total allocated > > > Anyone ideas on other tunables that might keep the system running? I'm > not too concerned about performance. Otherwise I'll have to go spend > some money on an AMD64 mainboard, memory, and cpu :-( The only tunable I had that you didn't was this one: vfs.zfs.arc_max="83886080" FWIW, my i386 system has 1.5GB RAM. More RAM might help, and/or you probably still need to do some balancing (read: fiddling) with the tunables you're already adjusting. JN
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