Re: [PATCH]sched: Isochronous class v2 for unprivileged soft rt scheduling

[Con Kolivas]

Jack O'Quin wrote:
> Con Kolivas <kernel@xxxxxxxxxxx> writes:
>
>
> > There are two things that the SCHED_ISO you tried is not that
> > SCHED_FIFO is - As you mentioned there is no priority support, and it
> > is RR, not FIFO. I am not sure whether it is one and or the other
> > responsible. Both can be added to SCHED_ISO. I haven't looked at jackd
> > code but it should be trivial to change SCHED_FIFO to SCHED_RR to see
> > if RR with priority support is enough or not. 
>
>
> Sure, that's easy.  I didn't do it because I assumed it would not
> matter.  Since the RR scheduling quantum is considerably longer than
> the basic 1.45msec audio cycle, it should work exactly the same.  I'll
> cobble together a JACK version to try that for you.

If you already know the audio cycle is much less than 10ms then there 
isn't much point trying it.

> > Second the patch I sent you is fine for testing; I was hoping you
> > would try it. What you can't do with it is spawn lots of userspace
> > apps safely SCHED_ISO with it - it will crash, but it not take down
> > your hard disk. I've had significantly better results with that
> > patch so far. Then we cn take it from there.
>
>
> Sorry.  I took you literally when you said it was not yet ready to
> try.  This would be the isoprio3 patch you posted?

Yes it is.

> Do I have to use 2.6.11-rc1-mm2, or will it work with 2.6.11-rc1?

It was for mm2, but should patch on an iso2 patched kernel.

Thanks!

Con
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