[PlanetCCRMA] sound problem

[Fernando Lopez-Lezcano]

On Wed, 2008-09-17 at 07:04 -0400, Pat wrote:
> I am running the latest ccrma RT kernel for FC9

Could you please type "uname -r" and send the result? I don't know if
you are using the testing kernel or the stable. 

> I have tried numerous settings in various combinations
> Right now, I think I have.
> Priority, manually set to 89

Nope, don't change the priority. It is tuned for best performance. I
think 89 will put jackd over the hardware interrupts from the soundcard
and then you will have problems. 

> Frames/Period 1024 (I have tried 512)
> Sample rate 44100
> Periods Buffer 4 (i have tried 3-4-5-6-7, makes no difference)
> Port Max 64

This should not make a difference.
What is the output from the jack command line that I sent you?

-- Fernando


> timeout 500
> Audio: output only
> Start delay 1 sec.
> 
> Realtime or not makes no difference.
> 
> 
> Fernando Lopez-Lezcano wrote:
> > On Tue, 2008-09-16 at 14:47 -0400, Pat wrote:
> >   
> >> Here is my setup
> >> Laptop Toshiba 8510p , Intel Duo 2.2Mhz
> >> 2G ram
> >> Fedora Core 9
> >> External SoundBlaster MP3+ (S80270) or On-Board Intel chipset. (they
> >> both do it)
> >>
> >> Planet.CCRMA.apps.i386-2007.11.22-1.fc9.ccrma everything updated.
> >>
> >> Now, here's my problem.
> >> I cannot get the sound to stop dropping. Jackd only shows 40% use. Not
> >> running realtime, no XRuns etc etc. 
> >>     
> >
> > Hmmm, which kernel are you running? (uname -r to know). 
> > How are you running jack? Exactly which options?
> >
> > For example:
> >   jackd -R -d alsa -d hw:0
> > would be the minimum starting point... what happens with those
> > parameters?
> >
> >   
> >> It should be fine.  I tried just
> >> about every setting I could think of. I get it to work okay, but the
> >> sound experiences constant tiny drops or gaps.
> >>     
> >
> > What do you mean it works ok? If you have gaps it is not working
> > right...
> >
> > -- Fernando
> >
> >
> >   
> >> If I record a song as a WAV file, I can open it in Audacity and see each
> >> drop, which are fractions of seconds where the output just stops. I can
> >> edit and remove the gaps, and everything sounds fine. But I can't do
> >> this all the time. There must be a way.
> >>
> >> I've tried disabling APIC, changing priorities of processes for IRQ's
> >> and applications etc etc. Nothing improves.
> >>
> >> Where should I be looking?
> >>
> >> Thanks.
> >>
> >>
> >>
> >>
> >> _______________________________________________
> >> PlanetCCRMA mailing list
> >> PlanetCCRMA at ccrma.stanford.edu
> >> http://ccrma-mail.stanford.edu/mailman/listinfo/planetccrma
> >>     
> >
> >   
> 
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