Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751643AbWIMHPM (ORCPT ); Wed, 13 Sep 2006 03:15:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751656AbWIMHPL (ORCPT ); Wed, 13 Sep 2006 03:15:11 -0400 Received: from unthought.net ([212.97.129.88]:60422 "EHLO unthought.net") by vger.kernel.org with ESMTP id S1751643AbWIMHPJ (ORCPT ); Wed, 13 Sep 2006 03:15:09 -0400 Date: Wed, 13 Sep 2006 09:15:12 +0200 From: Jakob Oestergaard To: Dan Williams Cc: 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: <20060913071512.GA23492@unthought.net> Mail-Followup-To: Jakob Oestergaard , 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> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1158015632.4241.31.camel@dwillia2-linux.ch.intel.com> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1034 Lines: 26 On Mon, Sep 11, 2006 at 04:00:32PM -0700, Dan Williams wrote: > Neil, > ... > > Concerning the context switching performance concerns raised at the > previous release, I have observed the following. For the hardware > accelerated case it appears that performance is always better with the > work queue than without since it allows multiple stripes to be operated > on simultaneously. I expect the same for an SMP platform, but so far my > testing has been limited to IOPs. For a single-processor > non-accelerated configuration I have not observed performance > degradation with work queue support enabled, but in the Kconfig option > help text I recommend disabling it (CONFIG_MD_RAID456_WORKQUEUE). Out of curiosity; how does accelerated compare to non-accelerated? -- / 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/