Date: Wed, 8 Jun 2005 11:00:46 -0400 (EDT) From: Jeff Roberson <jroberson@chesapeake.net> To: Jean-Yves Lefort <jylefort@freebsd.org> Cc: barner@freebsd.org, current@freebsd.org Subject: Re: Sound skipping problems Message-ID: <20050608110007.V16943@mail.chesapeake.net> In-Reply-To: <20050608164727.6a5b76f9.jylefort@FreeBSD.org> References: <20050607210453.S16943@mail.chesapeake.net> <20050608104844.GA24060@zi025.glhnet.mhn.de> <20050608131659.2f05a1d9.jylefort@FreeBSD.org> <20050608095624.J16943@mail.chesapeake.net> <20050608164727.6a5b76f9.jylefort@FreeBSD.org>
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On Wed, 8 Jun 2005, Jean-Yves Lefort wrote: > On Wed, 8 Jun 2005 09:57:15 -0400 (EDT) > Jeff Roberson <jroberson@chesapeake.net> wrote: > > > On Wed, 8 Jun 2005, Jean-Yves Lefort wrote: > > > > > On Wed, 8 Jun 2005 12:48:44 +0200 > > > Simon Barner <barner@FreeBSD.org> wrote: > > > > > > > Jeff Roberson wrote: > > > > > I have a patch that should greatly improve the sound skipping problems > > > > > people have under heavy io load. Several people sent me traces that > > > > > showed the buf daemon running for hundreds of milliseconds with Giant > > > > > held, which can hold up the pcm code. The patch is available at: > > > > > > > > > > http://www.chesapeake.net/~jroberson/flushbuf.diff > > > > > > > > [...] > > > > > > > > Can I use the patch on 5.4-STABLE? It applies cleanly (with offset, > > > > though), but I prefer to ask before doing useless tests. > > > > > > I've just tested it on 5.4-RELEASE, and it causes the system to hang > > > after a few seconds of heavy disk I/O. > > > > I have updated the patch to partially revert some earlier behavior. The > > hang didn't happen on my machine because I have more memory, but I'm > > confident of the cause. I updated it in place, feel free to try it on > > current or 5.x. > > This one works, and completely removes the sound jitter that used to > appear under heavy disk I/O (eg. untarring a 50 megs tarball). > > Congratulations! Thanks. I'd like to get some more experience with it under extreme load conditions, but I do eventually plan to MFC. > > PS: if no problems show up, do you intend to MFC this patch? > > -- > Jean-Yves Lefort > > jylefort@FreeBSD.org > http://lefort.be.eu.org/ >
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