From: Theodore Tso <tytso@mit.edu>
To: Jeff Garzik <jeff@garzik.org>
Cc: Adrian Bunk <bunk@kernel.org>,
"Brandeburg, Jesse" <jesse.brandeburg@intel.com>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
Chris Peterson <cpeterso@cpeterso.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
mpm@selenic.com
Subject: Re: [PATCH] drivers/net: remove network drivers' last few uses of IRQF_SAMPLE_RANDOM
Date: Thu, 15 May 2008 18:27:41 -0400 [thread overview]
Message-ID: <20080515222741.GQ18825@mit.edu> (raw)
In-Reply-To: <482CB354.3010205@garzik.org>
On Thu, May 15, 2008 at 06:04:04PM -0400, Jeff Garzik wrote:
>> I have seen embedded systems with zero entropy, and dubious entropy might
>> there be better than no entropy at all.
>> Or am I wrong on the latter?
>
> It's also relevant to the discussion to note that input data to kernel
> devrandom is mixed, and we can control the amount of "credit" applied to
> incoming entropy.
Sure, and one possible thing to do is to simply always input the
interrupt information to the random number generator, but give it a
"entropy credit" of 0. That has the net result of potentially
improving the entropy found in /dev/random and /dev/urandom, but not
necessarily compromising /dev/random, since /dev/random's output is
throttled by the entropy estimate.
The only cost of doing this would be the overhead in sending the
information into the entropy pool.
- Ted
next prev parent reply other threads:[~2008-05-15 22:28 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-15 7:11 [PATCH] drivers/net: remove network drivers' last few uses of IRQF_SAMPLE_RANDOM Chris Peterson
2008-05-15 13:21 ` Alan Cox
2008-05-15 16:07 ` Brandeburg, Jesse
2008-05-15 16:39 ` Alan Cox
2008-05-15 18:14 ` Jeff Garzik
2008-05-15 18:47 ` Kok, Auke
2008-05-15 19:10 ` Jeff Garzik
2008-05-15 18:50 ` Rick Jones
2008-05-15 19:11 ` Jeff Garzik
2008-05-15 19:55 ` [PATCH] " Jeff Garzik
2008-05-16 0:27 ` Andi Kleen
2008-05-16 9:56 ` Alan Cox
2008-05-16 10:19 ` Andi Kleen
2008-05-16 12:12 ` Herbert Xu
2008-05-16 16:25 ` Andi Kleen
2008-05-17 1:01 ` Herbert Xu
2008-05-17 10:59 ` Andi Kleen
2008-05-17 19:54 ` Chris Peterson
2008-05-17 20:05 ` Arjan van de Ven
2008-05-18 10:13 ` Andi Kleen
2008-05-18 11:26 ` Theodore Tso
2008-05-18 12:57 ` Joe Korty
2008-05-18 12:57 ` Joe Korty
2008-05-18 17:53 ` Andi Kleen
2008-05-18 17:53 ` Andi Kleen
2008-05-25 15:26 ` Glen Turner
2008-05-19 12:29 ` Benny Amorsen
2008-05-19 12:29 ` Benny Amorsen
2008-05-18 10:08 ` Andi Kleen
2008-05-22 9:28 ` Helge Hafting
2008-05-16 13:20 ` Adrian Bunk
2008-05-16 16:20 ` Andi Kleen
2008-05-16 19:47 ` David Miller
2008-05-16 23:28 ` Rick Jones
2008-05-15 18:04 ` Jeff Garzik
2008-05-15 18:17 ` Rick Jones
2008-05-15 18:31 ` Jeff Garzik
2008-05-15 18:47 ` Kok, Auke
2008-05-15 19:21 ` Jeff Garzik
2008-05-15 20:01 ` Chris Peterson
2008-05-15 20:16 ` Jeff Garzik
2008-05-15 20:39 ` Kok, Auke
2008-05-15 21:47 ` Theodore Tso
2008-05-15 21:58 ` Jeff Garzik
2008-05-15 21:58 ` Jeff Garzik
2008-05-15 22:29 ` Henrique de Moraes Holschuh
2008-05-15 22:44 ` Jeff Garzik
2008-05-15 23:02 ` Henrique de Moraes Holschuh
2008-05-15 23:36 ` Theodore Tso
2008-05-15 23:46 ` Henrique de Moraes Holschuh
2008-05-15 23:46 ` Henrique de Moraes Holschuh
2008-05-15 23:33 ` Theodore Tso
2008-05-15 23:58 ` Henrique de Moraes Holschuh
2008-05-15 23:58 ` Henrique de Moraes Holschuh
2008-05-16 13:21 ` Lennart Sorensen
2008-05-16 13:40 ` Jeff Garzik
2008-05-16 13:59 ` Will Newton
2008-05-16 14:15 ` Lennart Sorensen
2008-05-16 14:27 ` Jeff Garzik
2008-05-16 15:10 ` Alan Cox
2008-05-16 17:36 ` Lennart Sorensen
2008-05-16 18:11 ` Alan Cox
2008-05-16 18:40 ` Kok, Auke
2008-05-18 10:59 ` Matthias Andree
2008-05-16 18:41 ` Lennart Sorensen
2008-05-16 18:42 ` Lennart Sorensen
2008-05-16 20:04 ` Alan Cox
2008-05-16 20:39 ` Lennart Sorensen
2008-05-16 20:46 ` Alan Cox
2008-05-16 20:34 ` Benny Amorsen
2008-05-16 20:34 ` Benny Amorsen
2008-05-25 15:02 ` Glen Turner
2008-05-25 19:33 ` Benny Amorsen
2008-05-25 19:33 ` Benny Amorsen
2008-05-17 4:55 ` Chris Peterson
2008-05-25 15:09 ` Glen Turner
2008-05-25 23:27 ` Theodore Tso
2008-05-26 13:43 ` Alejandro Riveira Fernández
2008-05-26 15:14 ` Bill Fink
2008-05-26 21:07 ` Krzysztof Halasa
2008-05-26 21:52 ` Bill Fink
2008-05-26 22:11 ` Ben Hutchings
2008-05-27 16:44 ` Rick Jones
2008-05-30 19:50 ` Pavel Machek
[not found] ` <20080516191125.46 <20080525232712.GF5970@mit.edu>
2008-05-26 21:08 ` Gilles Espinasse
2008-05-25 14:55 ` Glen Turner
[not found] ` <482C8550 <20080516161029.44ded734@core>
2008-05-16 20:08 ` Gilles Espinasse
2008-05-17 22:02 ` Adrian Bunk
2008-05-18 6:41 ` [PATCH] drivers/net: remove network drivers' last few uses ofIRQF_SAMPLE_RANDOM Gilles Espinasse
2008-05-18 9:54 ` Alan Cox
2008-05-18 12:02 ` Adrian Bunk
2008-05-18 12:24 ` Theodore Tso
2008-05-18 14:43 ` Adrian Bunk
2008-05-15 21:55 ` [PATCH] drivers/net: remove network drivers' last few uses of IRQF_SAMPLE_RANDOM Adrian Bunk
2008-05-15 22:04 ` Jeff Garzik
2008-05-15 22:27 ` Theodore Tso [this message]
2008-05-15 22:13 ` Jesper Juhl
2008-05-15 22:34 ` Theodore Tso
2008-05-15 22:57 ` Jesper Juhl
2008-05-15 22:57 ` Jesper Juhl
2008-05-18 0:36 ` Matt Mackall
2008-05-18 11:03 ` Matthias Andree
2008-05-15 22:42 ` Jeff Garzik
-- strict thread matches above, loose matches on Subject: below --
2010-04-10 5:29 Chris Peterson
2010-04-15 6:42 ` David Miller
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