From: Borislav Petkov <bp@alien8.de>
To: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Cc: "Johannes Goetzfried"
<Johannes.Goetzfried@informatik.stud.uni-erlangen.de>,
"Herbert Xu" <herbert@gondor.hengli.com.au>,
linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org,
"Tilo Müller" <tilo.mueller@informatik.uni-erlangen.de>
Subject: Re: [PATCH] crypto: twofish - add x86_64/avx assembler implementation
Date: Wed, 15 Aug 2012 11:28:04 +0200 [thread overview]
Message-ID: <20120815092804.GA14676@x1.osrc.amd.com> (raw)
In-Reply-To: <20120815114216.209814z4mq3hxqe8@www.81.fi>
On Wed, Aug 15, 2012 at 11:42:16AM +0300, Jussi Kivilinna wrote:
> I started thinking about the performance on AMD Bulldozer.
> vmovq/vmovd/vpextr*/vpinsr* between FPU and general purpose registers
> on AMD CPU is alot slower (latencies from 8 to 12 cycles) than on
> Intel sandy-bridge (where instructions have latency of 1 to 2). See:
> http://www.agner.org/optimize/instruction_tables.pdf
>
> It would be really good, if implementation could be tested on AMD CPU
> to determinate, if it causes performance regression. However I don't
> have access to machine with such CPU.
But I do. :)
And if you tell me exactly how to run the tests and on what kernel, I'll
try to do so.
HTH.
--
Regards/Gruss,
Boris.
next prev parent reply other threads:[~2012-08-15 9:28 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-27 14:49 [PATCH] crypto: twofish - add x86_64/avx assembler implementation Johannes Goetzfried
2012-05-28 6:25 ` Jussi Kivilinna
2012-05-28 13:52 ` Johannes Goetzfried
2012-08-15 8:42 ` Jussi Kivilinna
2012-08-15 9:28 ` Borislav Petkov [this message]
2012-08-15 11:00 ` Jussi Kivilinna
2012-08-15 12:52 ` Borislav Petkov
2012-08-15 13:48 ` Jussi Kivilinna
2012-08-15 14:03 ` Borislav Petkov
2012-08-15 14:22 ` Jussi Kivilinna
2012-08-15 15:33 ` Borislav Petkov
2012-08-15 17:34 ` Jussi Kivilinna
2012-08-16 13:29 ` Borislav Petkov
2012-08-16 14:26 ` Jussi Kivilinna
2012-08-17 7:37 ` Jussi Kivilinna
2012-08-20 17:32 ` Borislav Petkov
2012-08-22 4:35 ` Jussi Kivilinna
2012-08-22 13:31 ` Borislav Petkov
2012-08-22 19:20 ` Jussi Kivilinna
2012-08-23 0:05 ` Jason Garrett-Glaser
2012-08-23 8:33 ` Jussi Kivilinna
2012-08-23 14:36 ` Borislav Petkov
2012-08-28 9:17 ` Jussi Kivilinna
2012-08-28 16:25 ` Borislav Petkov
2012-05-28 13:54 Johannes Goetzfried
2012-06-12 10:05 ` Herbert Xu
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