From owner-freebsd-isdn Sun Jul 19 03:32:31 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id DAA00140 for freebsd-isdn-outgoing; Sun, 19 Jul 1998 03:32:31 -0700 (PDT) (envelope-from owner-freebsd-isdn@FreeBSD.ORG) Received: from mail.ppp.net (mail.ppp.net [194.64.12.35]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id DAA29996 for ; Sun, 19 Jul 1998 03:32:16 -0700 (PDT) (envelope-from ernie!bert.kts.org!hm@ppp.net) Received: from casparc.ppp.net (casparc2.ppp.net [194.64.12.42]) by mail.ppp.net (8.8.8/8.8.8) with SMTP id MAA01937; Sun, 19 Jul 1998 12:31:59 +0200 Received: from ernie by casparc.ppp.net with uucp (Smail3.1.28.1 #1) id m0yxql8-002ZjZC; Sun, 19 Jul 98 12:32 MET DST Received: from bert.kts.org(really [194.55.156.2]) by ernie.kts.org via sendmail with smtp id for ; Sun, 19 Jul 1998 12:00:19 +0200 (CEST) (Smail-3.2.0.91 1997-Jan-14 #3 built 1998-Feb-14) Received: by bert.kts.org via sendmail with stdio id for freebsd-isdn@FreeBSD.ORG; Sun, 19 Jul 1998 11:54:36 +0200 (CEST) (Smail-3.2.0.94 1997-Apr-22 #1 built 1998-Jun-6) Message-Id: From: hm@kts.org (Hellmuth Michaelis) Subject: Re: could i4b influence sound? In-Reply-To: <19980717083803.A4710@gil.physik.rwth-aachen.de> from Christoph Kukulies at "Jul 17, 98 08:38:03 am" To: kuku@gilberto.physik.RWTH-Aachen.DE (Christoph Kukulies) Date: Sun, 19 Jul 1998 11:54:36 +0200 (CEST) Cc: freebsd-isdn@FreeBSD.ORG Organization: Kitchen Table Systems Reply-To: hm@kts.org X-Mailer: ELM [version 2.4ME+ PL38 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-isdn@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org 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) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isdn" in the body of the message