Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262600AbUKLSZJ (ORCPT ); Fri, 12 Nov 2004 13:25:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262601AbUKLSZI (ORCPT ); Fri, 12 Nov 2004 13:25:08 -0500 Received: from dfw-gate1.raytheon.com ([199.46.199.230]:23432 "EHLO dfw-gate1.raytheon.com") by vger.kernel.org with ESMTP id S262600AbUKLSYV (ORCPT ); Fri, 12 Nov 2004 13:24:21 -0500 Subject: Re: [patch] Real-Time Preemption, -RT-2.6.10-rc1-mm3-V0.7.25-1 To: Shane Shrybman Cc: Amit Shah , Karsten Wiese , Bill Huey , Adam Heath , emann@mrv.com, Gunther Persoons , "K.R. Foley" , linux-kernel , Ingo Molnar , Florian Schmidt , Fernando Pablo Lopez-Lezcano , Lee Revell , Rui Nuno Capela , Thomas Gleixner , Michal Schmidt X-Mailer: Lotus Notes Release 5.0.8 June 18, 2001 Message-ID: From: Mark_H_Johnson@RAYTHEON.COM Date: Fri, 12 Nov 2004 12:23:51 -0600 X-MIMETrack: Serialize by Router on RTSHOU-DS01/RTS/Raytheon/US(Release 6.5.2|June 01, 2004) at 11/12/2004 12:23:56 PM MIME-Version: 1.0 Content-type: text/plain; charset=US-ASCII X-SPAM: 0.00 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1159 Lines: 30 >Typical example of the error message: > >kernel: hde: dma_timer_expiry: dma status == 0x24 >kernel: ALSA sound/core/pcm_native.c:1424: playback drain error (DMA or IRQ trouble?) >kernel: PDC202XX: Primary channel reset. >kernel: hde: DMA interrupt recovery >kernel: hde: lost interrupt > >This was on a Promise TX2 133 ide card with one IDE disk. The problem >would show itself if using the RT patches and APIC. But the problem seems >to have been resolved now. I had errors like that one when the IDE IRQ was at a priority less than the real time task. Since then, I run with all the IRQ's at max RT priority and will continue to do so until I get a better assessment of what my real application (not these audio tests...) needs for IRQ priorities. This may have been fixed as a side effect of Ingo setting the IRQ threads at RT priorities in the 40's. --Mark H Johnson - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/