From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263049AbTDRON1 (ORCPT ); Fri, 18 Apr 2003 10:13:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263050AbTDRON1 (ORCPT ); Fri, 18 Apr 2003 10:13:27 -0400 Received: from chaos.physics.uiowa.edu ([128.255.34.189]:26058 "EHLO chaos.physics.uiowa.edu") by vger.kernel.org with ESMTP id S263049AbTDRON0 (ORCPT ); Fri, 18 Apr 2003 10:13:26 -0400 Date: Fri, 18 Apr 2003 09:25:21 -0500 (CDT) From: Kai Germaschewski X-X-Sender: kai@chaos.physics.uiowa.edu To: Stephan von Krawczynski cc: linux-kernel Subject: Re: ISDN massive packet drops while DVD burn/verify In-Reply-To: <20030416151221.71d099ba.skraw@ithnet.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 16 Apr 2003, Stephan von Krawczynski wrote: > I just experienced a massive ISDN problem while writing DVDs. > It looks like bigger IP packets (bigger than normal ICMP ping) > get simply dropped most of the time. > I think the packets get lost because some allocation continously fails and disk > i/o is faster in re-gaining the mem, but I am not quite sure. Could as well be > ide-scsi is partially busy-looping the box to death. > As soon as DVD writing is stopped everything comes back to normal. > Reading DVDs does not show the problem btw. > ping -s 1500 a.b.c.d shows about 5 packets, then stops. My best guess would be that IDE blocks IRQs for too long and hisax interrupts get lost. You could try whether hdparm -u1 helps, and a debugging log from the hisax driver may confirm over/underruns. --Kai