Messages in this thread | | | Subject | Re: [PATCH]sched: Isochronous class v2 for unprivileged soft rt scheduling | From | "Jack O'Quin" <> | Date | Mon, 24 Jan 2005 00:30:48 -0600 |
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Ingo Molnar <mingo@elte.hu> writes:
> just finished a short testrun with nice--20 compared to SCHED_FIFO, on a > relatively slow 466 MHz box:
Has anyone done this kind of realtime testing on an SMP system? I'd love to know how they compare. Unfortunately, I don't have access to one at the moment. Are they generally better or worse for this kind of work? I'm not asking about partitioning or processor affinity, but actually using the entire SMP complex as a realtime machine.
Our current jack_test scripts wouldn't exercise a multiprocessor very well. But, even those results would be interesting to know. Then, I think we could modify them to start muliple JACK servers. That will probably require using the dummy backend driver, which would need a more accurate timer source than its current usleep() call to provide reliable low latency results. (We currently drive the audio cycle from ALSA driver interrupts, but each JACK server requires a dedicated sound card for that.) -- joq - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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