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SubjectRe: Linux 2.6.9 latencies: scheduler bug?

* Sami Farin <7atbggg02@sneakemail.com> wrote:

> forget this stupid ip_tables.c patch, latencies have nothing to do with
> netfilter code, but bad interaction between xmms, rtc_latencytest
> and iptables. I now get at max 3.1s (yup, 3100000us) latencies.
> http://safari.iki.fi/2.6.9-xmms-fun-1.png
> if you want to reproduce this:
> 1) run "rtc_latencytest 1024" (can't reproduce with "rtc_latencytest 512")
> 2) press play in xmms
> 3) start iptables-script

to further debug any latencies please apply the -RT patchset and enable
PREEMPT_TIMING (and LATENCY_TRACING), that enables us to tell us more
about the latencies. You dont have to enable PREEMPT_REALTIME (the most
experimental feature of the patchset) to measure latencies.

Ingo
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