Date: Mon, 17 Jul 1995 16:55:51 -0700 (PDT) From: John Dyson <dyson> To: henrich@crh.cl.msu.edu (Charles Henrich) Cc: freebsd-hackers@freebsd.org Subject: Re: File cache needs lower vm priority Message-ID: <199507172355.QAA01087@freefall.cdrom.com> In-Reply-To: <199507171939.PAA03323@crh.cl.msu.edu> from "Charles Henrich" at Jul 17, 95 03:39:17 pm
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> > FreeBSD's merged cache needs to throw out file data at the slightest need from > a real process. Whenever any real I/O is going on things slow to a crawl. > > -Crh > The file cache is about as low in priority as it can be. The pages in the file cache that are not pointed to by buffers are in the cache list. Those pages are almost as available as free pages. If you have any pages in the cache list, then you should not block waiting for memory. It might be that the overhead for the buffer management is getting to your machine. I am currently working on improving the efficiency, but on a /66 or faster the overhead should not be a killer. John dyson@root.com
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