From: Oliver Mangold <o.mangold@gmail.com>
To: linux-crypto@vger.kernel.org
Subject: Re: Poor RNG performance on Ryzen
Date: Fri, 21 Jul 2017 16:55:12 +0200 [thread overview]
Message-ID: <c1010252-5648-85de-d71b-750aa2881b64@gmail.com> (raw)
In-Reply-To: <20170721144741.4igkvsd2fowptsy2@thunk.org>
On 21.07.2017 16:47, Theodore Ts'o wrote:
> On Fri, Jul 21, 2017 at 01:39:13PM +0200, Oliver Mangold wrote:
>> Better, but obviously there is still much room for improvement by reducing
>> the number of calls to RDRAND.
> Hmm, is there some way we can easily tell we are running on Ryzen? Or
> do we believe this is going to be true for all AMD devices?
I would like to note that my first measurement on Broadwell suggest that
the current frequency of RDRAND calls seems to slow things down on Intel
also (but not as much as on Ryzen).
next prev parent reply other threads:[~2017-07-21 14:55 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-21 7:12 Poor RNG performance on Ryzen Oliver Mangold
2017-07-21 9:26 ` Jan Glauber
2017-07-21 11:39 ` Oliver Mangold
2017-07-21 14:47 ` Theodore Ts'o
2017-07-21 14:55 ` Oliver Mangold [this message]
2017-07-22 18:16 ` Theodore Ts'o
2017-07-25 6:20 ` Jan Glauber
2017-07-21 15:04 ` Gary R Hook
2017-07-21 12:11 ` Jeffrey Walton
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