Re: [patch] Real-Time Preemption, -RT-2.6.10-rc1-mm3-V0.7.25-1

From: Ingo Molnar
Date: Mon Nov 15 2004 - 13:53:17 EST

* Mark_H_Johnson@xxxxxxxxxxxx <Mark_H_Johnson@xxxxxxxxxxxx> wrote:

> 1209 80000000 0.005ms (+0.000ms): do_nmi (mcount)
> 1209 80000000 0.005ms (+0.000ms): do_nmi (<00200286>)
> 1209 80000000 0.006ms (+0.000ms): profile_hook (profile_tick)
> 1209 80000000 0.006ms (+0.000ms): _raw_read_lock (profile_hook)
> 1209 80000000 0.007ms (+0.196ms): _raw_read_unlock (profile_tick)
> 1209 80000000 0.204ms (+0.001ms): set_new_owner (__down_mutex)

i've seen NMIs causing such problems before. Could you try a testrun
with all debug options disabled in the .config (and REGPARM enabled,
etc.) plus nmi_watchdog=0? Just to see how many of the artifacts are
related to debugging overhead.

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