From owner-freebsd-stable@FreeBSD.ORG  Thu Sep 28 14:14:29 2006
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
X-Original-To: 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 28F4716A412;
	Thu, 28 Sep 2006 14:14:29 +0000 (UTC)
	(envelope-from scottl@samsco.org)
Received: from pooker.samsco.org (pooker.samsco.org [168.103.85.57])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 8F56A43D69;
	Thu, 28 Sep 2006 14:14:26 +0000 (GMT)
	(envelope-from scottl@samsco.org)
Received: from [192.168.254.14] (imini.samsco.home [192.168.254.14])
	(authenticated bits=0)
	by pooker.samsco.org (8.13.4/8.13.4) with ESMTP id k8SEDphM024708;
	Thu, 28 Sep 2006 08:13:57 -0600 (MDT)
	(envelope-from scottl@samsco.org)
Message-ID: <451BD89F.8080203@samsco.org>
Date: Thu, 28 Sep 2006 08:13:51 -0600
From: Scott Long <scottl@samsco.org>
User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US;
	rv:1.7.7) Gecko/20050416
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: Steven Hartland <killing@multiplay.co.uk>
References: <451A1375.5080202@gneto.com>
	<20060927071538.GF22229@e-Gitt.NET><451A4189.5020906@samsco.org>
	<20060927152824.GJ22229@e-Gitt.NET><20060927155553.GB14563@icarus.home.lan><20060927155904.GM22229@e-Gitt.NET>
	<451AA7B1.5080202@samsco.org><20060927191402.GB932@turion.vk2pj.dyndns.org><20060927210349.GG14975@tnn.dglawrence.com>
	<451AEB02.2090806@samsco.org>
	<002201c6e290$45ece980$b3db87d4@multiplay.co.uk>
In-Reply-To: <002201c6e290$45ece980$b3db87d4@multiplay.co.uk>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
X-Spam-Status: No, score=-1.4 required=3.8 tests=ALL_TRUSTED autolearn=failed 
	version=3.1.1
X-Spam-Checker-Version: SpamAssassin 3.1.1 (2006-03-10) on pooker.samsco.org
Cc: Peter Jeremy <peterjeremy@optushome.com.au>, freebsd-stable@freebsd.org,
	John Baldwin <jhb@freebsd.org>, Oliver Brandmueller <ob@e-Gitt.NET>
Subject: CALL FOR TESTERS! [Re: 6.2 SHOWSTOPPER - em completely unusable on
 6.2]
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.5
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: Thu, 28 Sep 2006 14:14:29 -0000

All,

Attached is my first cut at addressing the problems described in this 
thread.  As I discussed earlier, the VM syncer thread is likely starving
the USB interrupt thread.  This causes the shared usb+network interrupt 
to remain masked, preventing network interrupts from being delivered,
and thus triggering watchdog timeouts.

This patch only addresses the USB driver.  If your network card is 
sharing an interrupt with something other than (or additional to) USB,
this might not work for you.  Also, this patch is just a very rough
proof-of-concept and is not meant for production use.  But I'd like to
get feedback now before I spend more time on this.  If this works then
I'll clean it up and make it suitable for the release, and I'll look at
some of the other drivers like ichsmb.

If this is to be fixed for 6.2, I need lots of feedback ASAP.  So please
do not be shy =-)  The patch is at:

http://people.freebsd.org/~scottl/usb_fastintr.diff

Scott