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    SubjectRe: bad networking related lag in v2.6.22-rc2

    * Ingo Molnar <mingo@elte.hu> wrote:

    > ok, i got your -rc2 debug numbers (off-list), and it doesnt look pretty:
    >
    > before-lag:
    >
    > sleep_max : 259502076
    > block_max : 27690921
    > wait_max : 16381558
    >
    > after-lag:
    >
    > sleep_max : 584186160
    > block_max : 261780071
    > wait_max : 881255577
    >
    > ouch! a nearly 1 second delay got observed by the scheduler - something
    > is really killing your system!
    >
    > what does 'top' show during an upload? Is any system related task out
    > of whack? Could you try to get a readprofile or an oprofile output
    > from the kernel, so that we can see what is slowing it down so much?
    > It could be something networking related in v2.6.22-rc2.

    ah, you got the latency tracer from Thomas, as part of the -hrt patchset
    - that makes it quite a bit easier to debug. Could you run the attached
    trace-it-10sec utility:

    trace-it-10sec > trace-to-ingo.txt

    and send me the (compressed) trace output (off-list, or post an URL to
    the trace)? Try to reproduce the 'lag' event in the 10 seconds while the
    tracer is running.

    Ingo
    -
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