Date: Thu, 9 Jun 2005 19:30:36 -0700 (PDT) From: Don Lewis <truckman@FreeBSD.org> To: emil@cs.rmit.edu.au Cc: freebsd-current@FreeBSD.org Subject: Re: Sound skipping problems Message-ID: <200506100230.j5A2UaBx028568@gw.catspoiler.org> In-Reply-To: <20050610020331.GA1264@cs.rmit.edu.au>
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On 10 Jun, Emil Mikulic wrote: > On Thu, Jun 09, 2005 at 06:06:28PM +0900, Pyun YongHyeon wrote: >> Wow! It helps a lot. > > Yeah, it's awesome! Great work, Jeff! > >> Even if maestro3(4) does not support channel_setblocksize I couldn't >> notice audio stuttering while extracting mozilla source. I noticed a >> few sound skipping when a command "rm -rf mozilla" was in progress. > > I notice the occasional stutter towards the end of "make clean" in > ports/www/firefox. Unless I'm reading it wrong, schedgraph is showing > that this is because of syncer, not bufdaemon. Not too suprising. The syncer probably call VOP_FSYNC() on one of the syncer vnodes, which walks the potentially very lengthy per-mount vnode list in order to handle inode timestamp updates. It would be a lot more efficient to handle the timestamp updates by putting the vnodes on the syncer work list and it would avoid the periodic massive bursts of file system activity. I started working on this quite a while ago, but ran into a few problems and ran out of time to work on it.
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