Date: Mon, 25 Mar 2002 02:04:17 +1100 (EST) From: Bruce Evans <bde@zeta.org.au> To: Robert Watson <rwatson@FreeBSD.ORG> Cc: John Hanley <jh_@yahoo.com>, Willie Viljoen <will@laserfence.net>, <freebsd-fs@FreeBSD.ORG>, <re@FreeBSD.ORG> Subject: Re: Soft update instability with heavy IO and offboard IDE controller Message-ID: <20020325020322.F45829-100000@gamplex.bde.org> In-Reply-To: <Pine.NEB.3.96L.1020323190730.47668K-100000@fledge.watson.org>
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On Sat, 23 Mar 2002, Robert Watson wrote: > On Sat, 23 Mar 2002, John Hanley wrote: > > > > turn off write caching at boot time in > > > /boot/loader.conf by adding the line hw.ata.wc=0 > > > > Surely a default install should result in write caching disabled, right? > > Since any new filesystems will default to using soft update. > > We turned it off by default in 4.4-RELEASE, I believe, and got utterly > pounded in the benchmarks, magazine reviews, etc, and turned it back on > for later RELENG_4 releases. On 5.0-CURRENT, it's off again by default > due to the assumptions concerning background fsck, which is on by default. > At some point, we need to have that whole discussion again. Basically, Nah, it goes on and off from time to time without even its maintainer knowing how :-). RCS file: /home/ncvs/src/sys/dev/ata/ata-disk.c,v Working file: ata-disk.c head: 1.128 PRE_NEWBUS: 1.6 keyword substitution: kv total revisions: 148; selected revisions: 148 description: ---------------------------- revision 1.125 date: 2002/03/05 09:24:19; author: sos; state: Exp; lines: +1 -1 Misc little cleanups: Link if only ATAPI device in kernel config Remove unused #includes Rearrange a bit in ata-raid to make diff against -stable smaller Enable wc as default again, dunne how this happend... ---------------------------- Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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