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    SubjectRe: [patch] voluntary-preempt-2.6.8.1-P9
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    On Tue, 2004-08-24 at 23:17, K.R. Foley wrote:
    > Ingo Molnar wrote:
    > >
    > > http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8.1-P9
    > >

    > latency trace of ~148 usec in scsi_request? I don't know if this is real
    > or not. Note the 79 usec here:
    >
    > 00000001 0.107ms (+0.079ms): sd_init_command (scsi_prep_fn)
    >
    > Entire trace is here:
    >
    > http://www.cybsft.com/testresults/2.6.8.1-P9/latency_trace7.txt
    >
    >
    > Is this possible? This is not the first time I have seen this. There is
    > another one here:
    >
    > http://www.cybsft.com/testresults/2.6.8.1-P9/latency_trace5.txt
    >

    This looks like a real latency. What is
    /sys/block/sdX/queue/max_sectors_kb set to? Does lowering it help?

    Lee

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