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    SubjectRe: Is 2.3.7 only better for SMP
       Date: 	Mon, 21 Jun 1999 22:14:36 -0400
    From: Jim Nance <jlnance@sailboat.mis.uncwil.edu>

    Just a quick question about 2.3.7. Are the improvements only
    going to help SMP machines, or are they good for uniprocessor
    machines too?

    It will help on uniprocessors too, certainly.

    The advantage on both uniprocessor and SMP is that instead of writes
    going through the buffer cache, they go straight through the page
    cache. This is noticable especially if the next thing that happens is
    a read of the just-written data, because the old code would need to
    copy the data out of the buffer cache and into the page cache, whereas
    now it would just be in the right place and copied directly to user
    space or mapped into the process's vm.

    One decent example of this case is a kernel build, generating all the
    .depend etc. files and then reading them back almost immediately.

    Later,
    David S. Miller
    davem@redhat.com

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