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Message-ID: <20100804125631.GC17263@redhat.com> Date: Wed, 4 Aug 2010 08:56:31 -0400 From: Mike Snitzer <snitzer@...hat.com> To: Mikael Abrahamsson <swmike@....pp.se> Cc: Christoph Hellwig <hch@...radead.org>, device-mapper development <dm-devel@...hat.com>, Michael Monnerie <michael.monnerie@...it-management.at>, linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>, Dominik Brodowski <linux@...inikbrodowski.net>, xfs@....sgi.com, linux-raid@...r.kernel.org Subject: Re: How to track down abysmal performance ata - raid1 - crypto - vg/lv - xfs On Wed, Aug 04 2010 at 7:53am -0400, Mikael Abrahamsson <swmike@....pp.se> 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/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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