Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.32-6

[Ingo Molnar]

* Mark_H_Johnson@xxxxxxxxxxxx <Mark_H_Johnson@xxxxxxxxxxxx> wrote:

> >well, i think this measurement issue needs resolving before jumping to
> >any generic conclusions. Not a single trace is extremely suspect. The
> >userspace timestamps are rdtsc based, or gettimeofday() based?

> rdtsc. Its actually code you sent me a while ago :-) when you
> suspected a measurement problem before.

could you try to put a few deliberate delays into the code - does the
kernel based tracing method pick the latency up correctly? (attaching to
the thread via gdb and then 'cont'-ing it ought to be enough i think.)
It's very weird.

	Ingo
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