Date: Mon, 22 Feb 1999 01:32:25 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Doug Rabson <dfr@nlsystems.com> Cc: Terry Lambert <tlambert@primenet.com>, freebsd-hackers@freebsd.org Subject: Re: Panic in FFS/4.0 as of yesterday Message-ID: <199902220932.BAA29386@apollo.backplane.com> References: <Pine.BSF.4.05.9902220915100.82049-100000@herring.nlsystems.com>
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I don't think B_EXPIDITE could ever be made to work well. Why not limit the number of async I/O write operations allowed to be in-progress at any given moment for ops run by the syncer, swapper, or flushdirtybufs?. Either on a vnode-by-vnode or a mount-by-mount basis? I do a poor-man's version of this for the swapper. At least then the hacks would be concentrated together rather then strewn all over the codebase. The write queueing problem seems to be quite general in nature, which means that the solution should not be to have to hack each and every device that might do I/O ( aka UFS in this case ). -Matt Matthew Dillon <dillon@backplane.com> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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