On 2006-05-23 16:30, mlfbsd <mlfbsd_at_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_at_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.Received on Tue May 23 2006 - 12:16:50 UTC
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