From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <mbroz@redhat.com>
Received: from mail.saout.de ([127.0.0.1])
 by localhost (mail.saout.de [127.0.0.1]) (amavisd-new, port 10024)
 with ESMTP id ggz5jkqZL33L for <dm-crypt@saout.de>;
 Mon, 23 Jul 2012 23:31:48 +0200 (CEST)
Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28])
 by mail.saout.de (Postfix) with ESMTP
 for <dm-crypt@saout.de>; Mon, 23 Jul 2012 23:31:47 +0200 (CEST)
Message-ID: <500DC2B0.8060409@redhat.com>
Date: Mon, 23 Jul 2012 23:31:28 +0200
From: Milan Broz <mbroz@redhat.com>
MIME-Version: 1.0
References: <20120722190757.GB10089@merlins.org>
 <20120722202213.GA7306@fancy-poultry.org>
 <20120722190757.GB10089@merlins.org> <1342986452.26887.3.camel@scapa>
 <20120722203929.GB3925@merlins.org> <20120722214757.GA16793@tansi.org>
 <20120723062850.GA6931@merlins.org> <20120723081407.GA872@tansi.org>
 <20120723161242.GB27727@merlins.org> <500D86AC.7090100@redhat.com>
 <20120723175129.GA15867@merlins.org>
In-Reply-To: <20120723175129.GA15867@merlins.org>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Subject: Re: [dm-crypt] aes-xts-plain with aes_x86_64 makes my SSD 5x slower
 than my encrypted HD
List-Id: <dm-crypt.saout.de>
List-Unsubscribe: <http://www.saout.de/mailman/options/dm-crypt>,
 <mailto:dm-crypt-request@saout.de?subject=unsubscribe>
List-Archive: <http://www.saout.de/pipermail/dm-crypt>
List-Post: <mailto:dm-crypt@saout.de>
List-Help: <mailto:dm-crypt-request@saout.de?subject=help>
List-Subscribe: <http://www.saout.de/mailman/listinfo/dm-crypt>,
 <mailto:dm-crypt-request@saout.de?subject=subscribe>
To: Marc MERLIN <marc@merlins.org>
Cc: dm-crypt@saout.de, Yves-Alexis Perez <corsac@debian.org>

On 07/23/2012 07:51 PM, Marc MERLIN wrote:
> On Mon, Jul 23, 2012 at 07:15:24PM +0200, Milan Broz wrote:
>>> Mmmh, I have one possible thing. I have a preempt kernel. Could that be it?
>>> http://marc.merlins.org/tmp/config-3.4.4-amd64-preempt.txt
>>
>> Can you send me your kernel .config then? Preempt should not be problem.
>> Which kernel version? which architecture? Any additional patches over
>> mainline code?
> 
> I just sent you my config, it was in the URL above :)
> No patches, kernel 3.4.4 from kernel.org, see above.

Ehm... sorry, I completely missed that. Thanks.

> Really?
> I used fdisk -H32 -S32 /dev/sda as recomended on
> http://www.void.gr/kargig/blog/2012/01/11/linux-ssd-partition-alignment-tips/

Do not use -H32 -S32. It is crazy and obsolete way how to align it...
Someone is wrong in the internet seems http://xkcd.com/386/ ;-)

Disk driver should set topology parameters which fdisk uses. But for your
case all is set to 512 bytes...

Whatever, there was a bug in fdisk, fixed now thanks to your report :)
https://github.com/karelzak/util-linux/commit/c0175e6185ac81843cbad33cbea75abd033f0e66

> Thanks for the other suggestions. Hopefully we'll nail this somehow :)

Well, please try some default distro compiled kernel if you can reproduce it there.

Milan