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    SubjectRe: Kernel 2.6.8.1: swap storm of death - CFQ scheduler=culprit
    On Tue, Aug 24, 2004 at 12:03:43PM +0200, Jens Axboe wrote:
    > On Mon, Aug 23 2004, Karl Vogel wrote:
    > > > > Jens, is this huge amount of bio/biovec's allocations
    > > > expected with CFQ? Its really really bad.
    > > >
    > > > Nope, it's not by design :-)
    > > >
    > > > A test case would be nice, then I'll fix it as soon as possible. But
    > > > please retest with 2.6.8.1 marcelo, 2.6.8-rc4 is missing an important
    > > > fix to ll_rw_blk that can easily cause this. The first report is for
    > > > 2.6.8.1, so I'm more puzzled on that.
    > >
    > > I tried with 2.6.8.1 and 2.6.8.1-mm4, both had the problem. If there
    > > is anything extra I need to try/record, just shoot!
    > >
    > > Original post with testcase + stats:
    > > http://article.gmane.org/gmane.linux.kernel/228156
    >
    > 2.6.8.1-mm4 clean does not reproduce the problem. Marcelo, your
    > 2.6.8-rc4 report is not valid due to the fixed problem related to that
    > in CFQ already. I'd still like for you to retest with 2.6.8.1.
    >
    > So I'm trying 2.6.8.1 with voluntary preempt applied now, the bug could
    > be related to that.

    Jens,

    You are right, I've been unable to reproduce the problem I was seeing
    (huge amount of bio/biovec's allocation causing major swapouts) with
    2.6.8.1.

    With this kernel, The 512MB system swaps around 50MB and recovers perfectly,
    I can't see any odd behaviour with CFQ.


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