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Date: Thu, 16 Aug 2012 10:57:16 -0700
From: Marc MERLIN <marc@merlins.org>
Message-ID: <20120816175716.GI8802@merlins.org>
References: <20120722190757.GB10089@merlins.org>
 <20120812124929.GM19851@reaktio.net> <20120816074333.GC8802@merlins.org>
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Subject: Re: [dm-crypt] aes-xts-plain with aes_x86_64 makes my SSD 5x slower
	than my encrypted HD
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To: =?iso-8859-1?Q?Andr=E9?= Gall <mail@andregall.de>
Cc: dm-crypt@saout.de

On Thu, Aug 16, 2012 at 06:28:06PM +0200, Andr=E9 Gall wrote:
> Hi Marc,
>=20
> thank you very much for your detailed investigation. I wanted to buy the =

> Samsung SSD 830 in the next few days to replace my old SSD. I chose this =

> drive explicitely because of it's "supposed" performance with encrypted=20
> data according to the benchmarks of incompressible data all around the=20
> internet. Seems like I should rethink this decision :)
=20
That's also why I bought it, and obviously it didn't work out.
I seem to remember that the OCZ Vertex 4 also does ok with data that doesn't
compress.

> >Samsung's old Benchmark registered so low on their own Random IO test=20
> >that the bar graph showing speed was a single line at the '0' mark.
>=20
> You don't happen to have a screenshot of this? This would make it much=20
> easier for people to understand there's something wrong!

Sure thing. Page updated:
http://marc.merlins.org/perso/linux/post_2012-08-15_The-tale-of-SSDs_-Cruci=
al-C300-early-Death_-Samsung-830-extreme-random-IO-slowness_-and-settling-w=
ith-OCZ-Vertex-4.html

Marc
--=20
"A mouse is a device used to point at the xterm you want to type in" - A.S.=
R.
Microsoft is to operating systems ....
                                      .... what McDonalds is to gourmet coo=
king
Home page: http://marc.merlins.org/ =20