Date: Tue, 23 May 2006 17:17:57 +0300 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: mlfbsd <mlfbsd@cognet.ci0.org> Cc: current@freebsd.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: md /tmp and async mounts Message-ID: <20060523141757.GA2966@gothmog.pc> In-Reply-To: <20060523143013.GA11472@ci0.org> References: <20060522211223.GA3621@xor.obsecurity.org> <20060522231437.GC1446@odin.ac.hmc.edu> <20060523133037.GA2908@gothmog.pc> <20060523143013.GA11472@ci0.org>
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On 2006-05-23 16:30, mlfbsd <mlfbsd@cognet.ci0.org> wrote: >On Tue, May 23, 2006 at 04:30:37PM +0300, Giorgos Keramidas wrote: >>On 2006-05-22 16:14, Brooks Davis <brooks@one-eyed-alien.net> wrote: >>>On Mon, May 22, 2006 at 05:12:24PM -0400, Kris Kennaway wrote: >>>> I noticed that with tmpmfs in rc.conf, the md is not being >>>> mounted with -o async; this is an enormous performance >>>> boost, so is there a reason it is not used, or just that it >>>> was overlooked? >>> >>> Just overlooked as far as I know. We correctly switched to >>> not mounting with softupdates, but should probably switch to >>> -o async. >> >> Right. The only reasons why the current tmpmfs_flags doesn't >> include the `-o async' option too are: >> >> a) It didn't back when it was all hardcoded in the script >> >> b) I didn't think about adding it by default when revision >> 1.230 of src/etc/defaults/rc.conf was committed by me >> >> If it does improve things, we should probably make the change :) > > The sys/dev/md/md.c rev 1.115 commit log says async used to be > the default, but was switched off because it was causing > deadlocks. Did this get fixed since ? I am not sure. If a deadlock *does* exist though, then it's not an improvement and we should definitely keep the default to its current state until the bug is fixed.
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