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Re: How to track down abysmal performance ata - raid1 - crypto - vg/lv -

To: Mikael Abrahamsson <swmike@xxxxxxxxx>
Subject: Re: How to track down abysmal performance ata - raid1 - crypto - vg/lv - xfs
From: Mike Snitzer <snitzer@xxxxxxxxxx>
Date: Wed, 4 Aug 2010 08:56:31 -0400
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, device-mapper development <dm-devel@xxxxxxxxxx>, Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Andi Kleen <ak@xxxxxxxxxxxxxxx>, Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx, linux-raid@xxxxxxxxxxxxxxx
In-reply-to: <alpine.DEB.1.10.1008041351100.19930@xxxxxxxxxxxxxxxx>
References: <20100804073546.GA7494@xxxxxxxxxxxxxxxxxxxxxxxxxx> <20100804085039.GA11671@xxxxxxxxxxxxx> <20100804091317.GA27779@xxxxxxxxxxxxxxxxxx> <20100804092122.GA2998@xxxxxxxxxxxxx> <20100804073546.GA7494@xxxxxxxxxxxxxxxxxxxxxxxxxx> <201008041116.09822@xxxxxx> <20100804102526.GB13766@xxxxxxxxxxxxxxxxxx> <20100804111803.GA32643@xxxxxxxxxxxxx> <alpine.DEB.1.10.1008041351100.19930@xxxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.20 (2009-12-10)
On Wed, Aug 04 2010 at  7:53am -0400,
Mikael Abrahamsson <swmike@xxxxxxxxx> 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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