Re: Linux 2.6.9 latencies: scheduler bug?

[Ingo Molnar]

* Sami Farin <7atbggg02@xxxxxxxxxxxxxx> 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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/