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Re: [dm-devel] How to track down abysmal performance ata - raid1 - crypto - vg/lv - xfs
- From: Mike Snitzer <snitzer redhat com>
- To: Mikael Abrahamsson <swmike swm pp se>
- Cc: Michael Monnerie <michael monnerie is it-management at>, linux-raid vger kernel org, Andi Kleen <ak linux intel com>, linux-kernel vger kernel org, Dominik Brodowski <linux dominikbrodowski net>, xfs oss sgi com, Christoph Hellwig <hch infradead org>, device-mapper development <dm-devel redhat com>
- Subject: Re: [dm-devel] How to track down abysmal performance ata - raid1 - crypto - vg/lv - xfs
- Date: Wed, 4 Aug 2010 08:56:31 -0400
On Wed, Aug 04 2010 at 7:53am -0400,
Mikael Abrahamsson <swmike swm 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/
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