Date: Thu, 28 Jul 2005 13:18:25 +0200 From: "Daniel Eriksson" <daniel_k_eriksson@telia.com> To: "FreeBSD Current" <freebsd-current@FreeBSD.org> Cc: Julian Elischer <julian@elischer.org> Subject: RE: VFS/VM over-runs. Was: Apparent strange disk behaviour in 6.0 Message-ID: <4F9C9299A10AE74E89EA580D14AA10A602859A@royal64.emp.zapto.org>
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Julian Elischer wrote: > I wonder if there is some tunable that can be changed? or whether it's > just a bug.. > > I think that a write that finds no buffer space should first free old > unused > buffers, and if there aren't any it should just wait. > Where's alan when > you need him :-) This problem has been reported before, both by me and by others. I'm pretty sure all three of these are symptoms of the same problem: * "Livelock seen on current with threaded processes" Kevin Oberman, June 5th http://docs.freebsd.org/cgi/mid.cgi?20050606032025.CC7A35D08 * "Serious I/O problems (bad performance and live-lock)" Daniel Eriksson, April 22nd http://docs.freebsd.org/cgi/mid.cgi?!~!UENERkVCMDkAAQACAAAAAAAAAAAAAAAAA BgAAAAAAAAA0VcX9IoJqUaXPS8MjT1PdsKAAAAQAAAAKDq8qQ2O9UK7PKMOCt2NqwEAAAAA This one has some additional info: http://docs.freebsd.org/cgi/mid.cgi?!~!UENERkVCMDkAAQACAAAAAAAAAAAAAAAAA BgAAAAAAAAA0VcX9IoJqUaXPS8MjT1PdsKAAAAQAAAA5xh4prxQBkmZLv9A9nCvPwEAAAAA * "ciss(4): speed degradation for Compaq Smart Array [3rd edition]" Andrey Koklin, April 12th http://docs.freebsd.org/cgi/mid.cgi?20050412135029.2d81a216.aka /Daniel Erikssonhelp
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