Re: [LAD] Kontakt Spikes

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To: Clemens Ladisch <clemens@...>
Cc: <linux-audio-dev@...>
Date: Monday, October 10, 2011 - 5:56 pm

On 10/08/2011 04:02 AM, Clemens Ladisch wrote:

No, it isn't used. This is just a by-product of the rtirq script that we
run at startup.

Have you ever seen "migration" or "watchdog" hold the CPU for any length
of time? I was curious about "migration" since

/proc/sys/kernel/sched_migration_cost = 500000

so I set cpu affinity on the threads, but it didn't change things.

>> Are there issues with memory mapping, that can block other unrelated

Yes, that was what I figured too. Thanks for the confirmation.

>> There do appear to be "involuntary context switches" (as reported by

SCHED_RR is what we want. Our realtime audio processing (and midi input)
threads all need to be able to run. They just must not be interrupted
ever by GUI or user level threads.

I'm not totally clear on how SCHED_RR and SCHED_FIFO relate though.
Would (a) a SCHED_RR/50 thread be run ahead of a SCHED_FIFO/49 thread?
And would (b) a SCHED_RR/50 thread interrupt a running SCHED_FIFO/49 thread?

Thanks for your reply,

Michael Ost
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Messages in current thread:
[LAD] Kontakt Spikes, Michael Ost, (Sat Oct 8, 1:26 am)
Re: [LAD] Kontakt Spikes, Clemens Ladisch, (Sat Oct 8, 11:03 am)
Re: [LAD] Kontakt Spikes, Michael Ost, (Mon Oct 10, 5:56 pm)
Re: [LAD] Kontakt Spikes, Clemens Ladisch, (Mon Oct 10, 10:05 pm)
Re: [LAD] Kontakt Spikes, Michael Ost, (Tue Oct 11, 12:42 am)
Re: [LAD] Kontakt Spikes, Clemens Ladisch, (Tue Oct 11, 8:24 am)
Re: [LAD] Kontakt Spikes, Clemens Ladisch, (Tue Oct 11, 8:52 am)
Re: [LAD] Kontakt Spikes, Michael Ost, (Tue Oct 11, 4:33 pm)
Re: [LAD] Kontakt Spikes, Paul Davis, (Tue Oct 11, 10:10 pm)
Re: [LAD] Kontakt Spikes, Michael Ost, (Tue Oct 25, 12:28 am)
Re: [LAD] Kontakt Spikes, Paul Davis, (Tue Oct 25, 12:36 am)
Re: [LAD] Kontakt Spikes, Michael Ost, (Tue Oct 11, 10:25 pm)
Re: [LAD] Kontakt Spikes, Robin Gareus, (Mon Oct 10, 7:05 pm)
Re: [LAD] Kontakt Spikes, Robin Gareus, (Mon Oct 10, 7:09 pm)
Re: [LAD] Kontakt Spikes, Nick Copeland, (Mon Oct 10, 8:37 pm)
Re: [LAD] Kontakt Spikes, Michael Ost, (Mon Oct 10, 8:48 pm)
Re: [LAD] Kontakt Spikes, Fons Adriaensen, (Mon Oct 10, 7:31 pm)
Re: [LAD] Kontakt Spikes, Robin Gareus, (Mon Oct 10, 7:37 pm)
Re: [LAD] Kontakt Spikes, Robin Gareus, (Sat Oct 8, 3:08 am)
Re: [LAD] Kontakt Spikes, Michael Ost, (Wed Oct 12, 11:28 pm)
Re: [LAD] Kontakt Spikes, Robin Gareus, (Thu Oct 13, 2:20 am)
Re: [LAD] Kontakt Spikes, Michael Ost, (Mon Oct 10, 6:03 pm)
Re: [LAD] Kontakt Spikes, Devin Anderson, (Sat Oct 8, 2:46 am)
Re: [LAD] Kontakt Spikes, Michael Ost, (Mon Oct 10, 7:38 pm)
Re: [LAD] Kontakt Spikes, Devin Anderson, (Mon Oct 10, 8:14 pm)