From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 8 Nov 2002 14:31:02 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 8 Nov 2002 14:31:02 -0500 Received: from neon-gw-l3.transmeta.com ([63.209.4.196]:48652 "EHLO neon-gw.transmeta.com") by vger.kernel.org with ESMTP id ; Fri, 8 Nov 2002 14:31:01 -0500 Message-ID: <3DCC126F.6020507@zytor.com> Date: Fri, 08 Nov 2002 11:37:19 -0800 From: "H. Peter Anvin" Organization: Zytor Communications User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.1) Gecko/20020828 X-Accept-Language: en, sv MIME-Version: 1.0 To: Alan Cox CC: Linux Kernel Mailing List Subject: Re: [Evms-announce] EVMS announcement References: <02110516191004.07074@boiler> <20021106001607.GJ27832@marowsky-bree.de> <103 6590957.9803.24.camel@irongate.swansea.linux.org.uk> <1036617718.9781.73.camel@irongate.swansea.linux.org.uk> <3DC9909A.6040905@zytor.com> <1036778770.16651.70.camel@irongate.swansea.linux.org.uk> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Alan Cox wrote: > On Wed, 2002-11-06 at 21:58, H. Peter Anvin wrote: > >>>ataraid is just driving dumb ide controllers in the way bios raid does >> >>I guess I meant it as a more general question than those specific devices. > > Our current software MD driver doesn't support doing that in hardware. > It has the neccessary infrastructure to consider using hardware xor > engines but I doubt its every actually more efficient to do so on low > end devices. Probably not. The only case where I can imagine it helps is when you get to push less data across the bus. -hpa