From owner-freebsd-alpha@FreeBSD.ORG Sun Jul 27 13:22:02 2003 Return-Path: Delivered-To: freebsd-alpha@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3686A37B401 for ; Sun, 27 Jul 2003 13:22:02 -0700 (PDT) Received: from srv1.cosmo-project.de (srv1.cosmo-project.de [213.83.6.106]) by mx1.FreeBSD.org (Postfix) with ESMTP id D7DE243FA3 for ; Sun, 27 Jul 2003 13:22:00 -0700 (PDT) (envelope-from ticso@cicely12.cicely.de) Received: from cicely5.cicely.de (cicely5.cicely.de [IPv6:3ffe:400:8d0:301:200:92ff:fe9b:20e7]) (authenticated bits=0) by srv1.cosmo-project.de (8.12.9/8.12.9) with ESMTP id h6RKLuhR047029 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=OK); Sun, 27 Jul 2003 22:21:58 +0200 (CEST) (envelope-from ticso@cicely12.cicely.de) Received: from cicely12.cicely.de (cicely12.cicely.de [IPv6:3ffe:400:8d0:301::12]) by cicely5.cicely.de (8.12.9/8.12.9) with ESMTP id h6RKLsAx068332 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Sun, 27 Jul 2003 22:21:54 +0200 (CEST) (envelope-from ticso@cicely12.cicely.de) Received: from cicely12.cicely.de (localhost [127.0.0.1]) by cicely12.cicely.de (8.12.9/8.12.9) with ESMTP id h6RKLsNS047731; Sun, 27 Jul 2003 22:21:54 +0200 (CEST) (envelope-from ticso@cicely12.cicely.de) Received: (from ticso@localhost) by cicely12.cicely.de (8.12.9/8.12.9/Submit) id h6RKLrO3047730; Sun, 27 Jul 2003 22:21:53 +0200 (CEST) Date: Sun, 27 Jul 2003 22:21:53 +0200 From: Bernd Walter To: Marcel Moolenaar Message-ID: <20030727202152.GN42805@cicely12.cicely.de> References: <20030726081120.GA7470@dhcp01.pn.xcllnt.net> <20030726163016.GF95189@freebie.xs4all.nl> <20030726183007.GA575@dhcp01.pn.xcllnt.net> <20030726184509.GA4440@freebie.xs4all.nl> <20030726192133.GB575@dhcp01.pn.xcllnt.net> <20030727081715.GB6392@freebie.xs4all.nl> <20030727091517.GA468@freebie.xs4all.nl> <20030727194616.GA608@athlon.pn.xcllnt.net> <20030727200356.GL42805@cicely12.cicely.de> <20030727200816.GB608@athlon.pn.xcllnt.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20030727200816.GB608@athlon.pn.xcllnt.net> X-Operating-System: FreeBSD cicely12.cicely.de 5.1-CURRENT alpha User-Agent: Mutt/1.5.4i cc: alpha@freebsd.org cc: ticso@cicely.de Subject: Re: NFS hangs appears dc(4) newbusification related X-BeenThere: freebsd-alpha@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: ticso@cicely.de List-Id: Porting FreeBSD to the Alpha List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 27 Jul 2003 20:22:02 -0000 On Sun, Jul 27, 2003 at 01:08:16PM -0700, Marcel Moolenaar wrote: > On Sun, Jul 27, 2003 at 10:03:57PM +0200, Bernd Walter wrote: > > > > It is true since day one and therefor TCP NFS never worked reliable > > on alpha. > > If and how often you trigger the bug depends on your usage. > > If you see anything else then an alignment panic then it's something > > new. > > It must be something new then. Which only means that a broken state > has further regressed... > > > > o Using TCP based NFS mounts is indeed broken and should at least > > > be mentioned somewhere, because the breakage is only visible on > > > alpha. Ideally it should be fixed. > > > > The alignemt bug is a problem on other strong alignment platforms as > > well. > > I don't see it here on ia64 nor sparc64. It happens rarely under very high load. There is a realignment code that works fine for a single missalignment in the input mbuf cluster, but fails if there is a second one. That also means that we need a condition with multiple transactions in the input queue to trigger this bug. Maybe it only triggers in server code, but the problem exists in the client code as well. -- B.Walter BWCT http://www.bwct.de ticso@bwct.de info@bwct.de