Re: [LAU] Re: difference between realtime-kernel and low-latency-kernel?

Hi,

On Thu, Oct 04, 2007 at 10:29:56AM +0200, Florian Schmidt wrote:
> [...]
> And yes, i consider it a bug that top and other software report the SCHED_FIFO
> prio as negative values. Where does that come from? Does the prio already get
> listed as negative in /proc? Or do they simply do it to separate the
> SCHED_FIFO threads from SCHED_OTHER threads? Anyways POSIX speaks of positive
> SCHED_FIFO prios in the range 1..99 afaik..

Hmmm, POSIX talks about priorities in the range of
   min .. max,
   where
     min = sched_get_priority_min(alg)
     max = sched_get_priority_max(alg)
     max - min >= 32, if alg == SCHED_FIFO or alg == SCHED_RR
     and alg being the the scheduling algorithm (like SCHED_FIFO, ...)

Under Linux (according to 'man sched_get_priority_min') the follwoing
ranges apply:
     SCHED_FIFO : min = 1, max = 99
     SCHED_RR : min = 1, max = 99
     SCHED_OTHER : min = 0, max = 0

jm5c,

Yours,

Jacob

>
> > I get visible xruns but not audible so far. I am guessing I have the wrong
> > buffer sizes between Pd, Csound, and jackd...
>
> No, i don't think so. If you use Pd and CSound as jack apps, then jack tells
> them what buffer size to use. If one of these used the wrong size you would
> definitely hear it..
>
> Start jack and run this script and tell us the output please:
>
> http://tapas.affenbande.org/rt-setup-report.sh
>
> Thanks,
> Flo
>
> --
> Palimm Palimm!
> http://tapas.affenbande.org
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Received on Thu Oct 4 16:15:02 2007