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    SubjectRe: Linux 2.4.1-ac7

    On Sat, 10 Feb 2001, Mike Galbraith wrote:

    > Hi Rik,
    > This change makes my box swap madly under load. It appears to be
    > keeping more cache around than is really needed, and therefore
    > having to resort to swap instead. The result is MUCH more I/O than
    > previous kernels while doing the same exact job.
    > My test load is make -jN bzImage. Previous kernels kept cache at
    > an average of ~20ish mb at a job level N at which level I had nearly
    > zero measurable throughput loss compared to single task compile.
    > >>From that, I surmise that the cachable component of this job must
    > fit in that roughly 20ish mb of space. (for otherwise, I would be
    > suffering throughput loss). With this vm change, cache is nearly
    > three times as large as usual. Where 30 tasks will run with only
    > modest throughput loss in ac5, ac8 throughput tapers off rapidly
    > at half of that.

    Swapped out pages were not being counted in the flushing limitation.

    Could you try the following patch?


    --- linux.orig/mm/vmscan.c Sat Feb 10 08:26:17 2001
    +++ linux/mm/vmscan.c Sat Feb 10 09:34:20 2001
    @@ -515,6 +515,7 @@

    + max_launder--;

    /* And re-start the thing.. */

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