Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751437AbWINHmq (ORCPT ); Thu, 14 Sep 2006 03:42:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751436AbWINHmp (ORCPT ); Thu, 14 Sep 2006 03:42:45 -0400 Received: from unthought.net ([212.97.129.88]:14856 "EHLO unthought.net") by vger.kernel.org with ESMTP id S1751433AbWINHmo (ORCPT ); Thu, 14 Sep 2006 03:42:44 -0400 Date: Thu, 14 Sep 2006 09:42:48 +0200 From: Jakob Oestergaard To: Dan Williams Cc: Dan Williams , NeilBrown , linux-raid@vger.kernel.org, akpm@osdl.org, linux-kernel@vger.kernel.org, christopher.leech@intel.com Subject: Re: [PATCH 00/19] Hardware Accelerated MD RAID5: Introduction Message-ID: <20060914074248.GD23492@unthought.net> Mail-Followup-To: Jakob Oestergaard , Dan Williams , Dan Williams , NeilBrown , linux-raid@vger.kernel.org, akpm@osdl.org, linux-kernel@vger.kernel.org, christopher.leech@intel.com References: <1158015632.4241.31.camel@dwillia2-linux.ch.intel.com> <20060913071512.GA23492@unthought.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1082 Lines: 37 On Wed, Sep 13, 2006 at 12:17:55PM -0700, Dan Williams wrote: ... > >Out of curiosity; how does accelerated compare to non-accelerated? > > One quick example: > 4-disk SATA array rebuild on iop321 without acceleration - 'top' > reports md0_resync and md0_raid5 dueling for the CPU each at ~50% > utilization. > > With acceleration - 'top' reports md0_resync cpu utilization at ~90% > with the rest split between md0_raid5 and md0_raid5_ops. > > The sync speed reported by /proc/mdstat is ~40% higher in the accelerated > case. Ok, nice :) > > That being said, array resync is a special case, so your mileage may > vary with other applications. Every-day usage I/O performance data would be nice indeed :) > I will put together some data from bonnie++, iozone, maybe contest, > and post it on SourceForge. Great! -- / jakob - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/