Messages in this thread |  | | | Date | Mon, 11 Jul 2005 07:03:03 +0200 | | From | Ingo Molnar <> | | Subject | Re: PREEMPT_RT and latency_trace |
* Serge Noiraud <serge.noiraud@bull.net> wrote:
> Hi, > > I have a big dilemna on one machine : > I run a task with RT priority which make a loop to mesure the system > perturbation. > It works well except on one machine. > On a multi-cpu, If I run the program on cpu 1, I get 23us. It's OK. > If I run the same program on cpu 0, I get 17373us !
could you try the -51-24 (or later) kernel, does it have any better latencies? It has a PI fix that fixes the recent priority leakage observed on SMP systems. The priority leakage can lead to excessive delays in RT apps.
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