Messages in this thread | | | Date | Thu, 9 Dec 2004 22:56:38 +0100 | From | Ingo Molnar <> | Subject | Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.32-6 |
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* Mark_H_Johnson@raytheon.com <Mark_H_Johnson@raytheon.com> 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.
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