Messages in this thread | | | Date | Mon, 25 Oct 2004 16:11:32 +0300 | From | Sami Farin <> | Subject | Re: Linux 2.6.9 latencies: scheduler bug? |
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On Mon, Oct 25, 2004 at 02:58:07PM +0200, Ingo Molnar wrote: > > * 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
which includes also -mm1...
> and enable PREEMPT_TIMING (and LATENCY_TRACING), that enables us to tell us more
I guess those are not available as individual patches which could be applied to 2.6.9?
Could someone with LATENCY_TRACING+PREEMPT_TIMING try to reproduce that xmms/rtc_latencytest/iptables thing... takes only a minute.
Pretty please?
> 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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