Date: Sun, 19 Jul 1998 11:54:36 +0200 (CEST) From: hm@kts.org (Hellmuth Michaelis) To: kuku@gilberto.physik.RWTH-Aachen.DE (Christoph Kukulies) Cc: freebsd-isdn@FreeBSD.ORG Subject: Re: could i4b influence sound? Message-ID: <m0yxqAu-000023C@bert.kts.org> In-Reply-To: <19980717083803.A4710@gil.physik.rwth-aachen.de> from Christoph Kukulies at "Jul 17, 98 08:38:03 am"
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Christoph Kukulies wrote:
> > > My sound applications (midi) are choppy and expose periodical pauses.
> >
> > It might be possible that i4b is the cause. Is an ISDN data transfer
> > happening at this time ? Or does it happen all the time ? What type of
> > card are you using ?
>
> No, I think the line was idle when this happens. It also doesn't
> seem to be correlated with the logs in /var/tmp/isdn.trace when I
> enable tracing which I first thought. Anyway, it seems to be
> happening at fixed time intervalls (that the sound stops playing).
When i saw this, i thought it might be the AVM issueing continous interrupts
(AVM cards have a timer onboard which might cause this) so i verified the AVM
driver - it does _not_ issue timer irq's; so thats not the cause.
> Well, the sound driver uses DMA and it's essential that the DMA done
> interrupt is being served with highest priority.
The sound driver (Luigi's new one) runs at spltty whereas isdn4bsd runs
at splimp.
hellmuth
--
Hellmuth Michaelis hm@kts.org Hamburg, Europe
A duck is like a bicycle because they both have two wheels except the duck
(terry@cs.weber.edu)
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