From owner-freebsd-stable@FreeBSD.ORG  Tue Mar  1 20:21:08 2005
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
Delivered-To: freebsd-stable@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 0DBFA16A4CE
	for <freebsd-stable@freebsd.org>;
	Tue,  1 Mar 2005 20:21:08 +0000 (GMT)
Received: from postal1.es.net (postal1.es.net [198.128.3.205])
	by mx1.FreeBSD.org (Postfix) with ESMTP id E18D043D2D
	for <freebsd-stable@freebsd.org>;
	Tue,  1 Mar 2005 20:21:07 +0000 (GMT)	(envelope-from oberman@es.net)
Received: from ptavv.es.net ([198.128.4.29])
        by postal1.es.net (Postal Node 1) with ESMTP (SSL) id IBA74465;
        Tue, 01 Mar 2005 12:21:07 -0800
Received: from ptavv (localhost [127.0.0.1])
	by ptavv.es.net (Tachyon Server) with ESMTP id 8F5525D07;
	Tue,  1 Mar 2005 12:21:07 -0800 (PST)
To: Godwin Stewart <gstewart@bonivet.net>
In-reply-to: Your message of "Tue, 01 Mar 2005 15:24:58 +0100."
             <20050301152458.6467caf3.gstewart@bonivet.net> 
Date: Tue, 01 Mar 2005 12:21:07 -0800
From: "Kevin Oberman" <oberman@es.net>
Message-Id: <20050301202107.8F5525D07@ptavv.es.net>
cc: freebsd-stable@freebsd.org
Subject: Re: Xorg 6.8.1 and SCHED_ULE vs. SCHED_4BSD 
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Production branch of FreeBSD source code
	<freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 01 Mar 2005 20:21:08 -0000

> Date: Tue, 1 Mar 2005 15:24:58 +0100
> From: Godwin Stewart <gstewart@bonivet.net>
> Sender: owner-freebsd-stable@freebsd.org
> 
> On Mon, 28 Feb 2005 16:21:39 -0800, "Kevin Oberman" <oberman@es.net> wrote:
> 
> > I'd say something is very wrong on your systems and I'd ALMOST bet it's
> > ata related. Maybe ATA-MkIII would help things out.
> 
> Possibly, altho' I doubt it given that the only short periods during which
> the machine is responsive are *during* disk I/O.

Please DON'T top post to any FreeBSD list!

This is starting to sound like it might be an interrupt routing issue
and interrupts from the disk are sharing an IRQ with something
else. "Something else" is generating interrupts that are never getting
delivered, but the disk interrupts are waking the appropriate driver to
allow things to proceed.
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman@es.net			Phone: +1 510 486-8634