From owner-freebsd-current@FreeBSD.ORG Sun Nov 4 15:00:52 2007 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 11FE116A420 for ; Sun, 4 Nov 2007 15:00:52 +0000 (UTC) (envelope-from kris@FreeBSD.org) Received: from weak.local (pointyhat.freebsd.org [IPv6:2001:4f8:fff6::2b]) by mx1.freebsd.org (Postfix) with ESMTP id 32DEE13C48A; Sun, 4 Nov 2007 15:00:51 +0000 (UTC) (envelope-from kris@FreeBSD.org) Message-ID: <472DDEA2.7080804@FreeBSD.org> Date: Sun, 04 Nov 2007 16:00:50 +0100 From: Kris Kennaway User-Agent: Thunderbird 2.0.0.6 (Macintosh/20070728) MIME-Version: 1.0 To: Thomas Sparrevohn References: <200711021208.25913.Thomas.Sparrevohn@btinternet.com> <472D9B2A.5080900@FreeBSD.org> <200711041302.08877.peter.schuller@infidyne.com> <200711041423.54336.Thomas.Sparrevohn@btinternet.com> In-Reply-To: <200711041423.54336.Thomas.Sparrevohn@btinternet.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-current@freebsd.org, Peter Schuller Subject: Re: ZFS Hangs X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 04 Nov 2007 15:00:52 -0000 Thomas Sparrevohn wrote: > On Sunday 04 November 2007 12:02:08 Peter Schuller wrote: >>> It certainly could be a caching effect but the particular problem you >>> were seeing should have been fixed. Are you still seeing it? >> I am not still seeing it; the machine has since been switched to AMD 64, and >> RAM increased from 1 GB to 3 GB (and FreeBSD itself upgraded several times >> since then). I did not look into it in terrible detail; I just observed by >> tracing that the I/O in question was definitely the package database, and >> that it was definitely accessing the same files mutiple times. I assumed it >> was a caching effect at the time, given all the maxvnode tweaking and sizing >> restrictions put on the ARC. I do know I never saw it after the memory >> increase. >> >> Also, this might have been prior to disabling prefetch. If it was, perhaps the >> prefetch hosed the cache. (Are the prefetch issues still there, anyone?) >> > > Hmm. I seeing the hang now - but had not been seeing it before as I had increased the arc cache > size - seems a very low arc_max - its about 300MB on a 4GB amd64 system > > However ZFS haning in "zfs:(&zio_cv_io)" is new - I have been running this system using ZFS for month > without any trouble - The only change I can think of is that the devices has been changes to ATA RAID 0+1 > apart from that everything worked before the 28/10-2007 - that when I installed the extra disks to change > from RAID 0 - to RAID 0+1 - > > http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug.html Kris