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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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