From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from tyke.pjc.net (public1-leed3-6-cust141.leed.broadband.ntl.com [80.0.5.141]) by dsl2.external.hp.com (Postfix) with ESMTP id 9B03C487E for ; Mon, 15 Jul 2002 07:57:59 -0600 (MDT) Received: from patrick by tyke.pjc.net with local (Exim 3.35 #1 (Debian)) id 17U6MP-0007MM-00 for ; Mon, 15 Jul 2002 14:57:57 +0100 Date: Mon, 15 Jul 2002 14:57:57 +0100 From: Patrick Caulfield To: parisc-linux@lists.parisc-linux.org Subject: Re: [parisc-linux] O_DIRECT on devices Message-ID: <20020715135757.GM808@tykepenguin.com> References: <20020711082259.GF822@tykepenguin.com> <20020715034632.E27706@parcelfarce.linux.theplanet.co.uk> <20020715074219.18CD54861@dsl2.external.hp.com> <20020715122919.F27706@parcelfarce.linux.theplanet.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 In-Reply-To: <20020715122919.F27706@parcelfarce.linux.theplanet.co.uk> Sender: parisc-linux-admin@lists.parisc-linux.org Errors-To: parisc-linux-admin@lists.parisc-linux.org List-Help: List-Post: List-Subscribe: , List-Id: parisc-linux developers list List-Unsubscribe: , List-Archive: On Mon, Jul 15, 2002 at 12:29:19PM +0100, Matthew Wilcox wrote: > On Mon, Jul 15, 2002 at 01:42:19AM -0600, Grant Grundler wrote: > > Randolph and I think most SMP bugs reported (and we seen ourselves) > > suggest a D-cache problem. > > Entirely plausible. PA has bigger virtually indexed caches than anyone > else, so we're more susceptible to cache aliasing bugs than anyone else. > It could be a missing flush somewhere in the arch-independent code. My machine isn't SMP but could a similar bug cause the problem to occur between the CPU and the DMA controller of the SCSI card ? patrick