From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Snitzer Subject: Re: How to track down abysmal performance ata - raid1 - crypto - vg/lv - xfs Date: Wed, 4 Aug 2010 08:56:31 -0400 Message-ID: <20100804125631.GC17263@redhat.com> References: <20100804073546.GA7494@comet.dominikbrodowski.net> <20100804085039.GA11671@infradead.org> <20100804091317.GA27779@isilmar-3.linta.de> <20100804092122.GA2998@infradead.org> <20100804073546.GA7494@comet.dominikbrodowski.net> <201008041116.09822@zmi.at> <20100804102526.GB13766@isilmar-3.linta.de> <20100804111803.GA32643@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Mikael Abrahamsson Cc: Christoph Hellwig , device-mapper development , Michael Monnerie , linux-kernel@vger.kernel.org, Andi Kleen , Dominik Brodowski , xfs@oss.sgi.com, linux-raid@vger.kernel.org List-Id: linux-raid.ids On Wed, Aug 04 2010 at 7:53am -0400, Mikael Abrahamsson wrote: > On Wed, 4 Aug 2010, Christoph Hellwig wrote: > > >The good news is that you have it tracked down, the bad news is > >that I know very little about dm-crypt. Maybe the issue is the > >single threaded decryption in dm-crypt? Can you check how much > >CPU time the dm crypt kernel thread uses? > > I'm not sure it's that. I have a Core i5 with AES-NI and that didn't > significantly increase my overall performance, as it's not there the > bottleneck is (at least in my system). You could try applying both of these patches that are pending review for hopeful inclussion in 2.6.36: https://patchwork.kernel.org/patch/103404/ https://patchwork.kernel.org/patch/112657/