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    SubjectRe: 2.4.8-pre7: still buffer cache problems[+2.4.9-pre3 comments]
    On Thu, Aug 09, 2001 at 08:20:32PM -0400, marc heckmann wrote:
    > >
    > > OK, there is no obvious way to do do drop-behind on
    > > buffer cache pages, but I think we can use a quick
    > > hack to make the system behave well under the presence
    > > of large amounts of buffer cache pages.
    > >
    > > What we could do is, in refill_inactive_scan(), just
    > > moving buffer cache pages to the inactive list regardless
    > > of page aging when there are too many buffercache pages
    > > around in the system.
    > >
    > > Does the patch below help you ?
    > well, the buffer cache still got huge and the system still swapped out like
    > mad, but it seemed like the buffer cache grew _slower_ and that the vm was
    > more fair towards other vm users. so interactivity was better but still far
    > from 2.2. and then it oops'ed [I don't think it was because of your patch
    > though..]:

    I tried 2.4.8 final and it fixes the problem.... could it be the
    fs/buffer.c changes? behaviour is now like 2.2 (good in this case). if I
    have time I'll try 2.4.8-ac5 to se if it also fixes it. thanks to whoever
    is responsible for the fix.

    also I tried 2.4.9-pre3 and it performs _much_ [I'd say 10 times better!]
    better under high VM load specifically when filling all ram+swap. Where
    2.4.8 used to thrash without making any progress what so ever [I'd have to
    reset], 2.4.9-pre3 will either oom_kill (the _right_ process) or manage to
    handle swap to let processes run without thrashing. this is all on PPC
    without any highmem (192Mb + 200mb swap.).



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