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Re: [RFC] enhanced version of net_random()

To: Jean-Luc Cooke <jlcooke@xxxxxxxxxxxxxx>
Subject: Re: [RFC] enhanced version of net_random()
From: Andreas Dilger <adilger@xxxxxxxxxxxxx>
Date: Fri, 20 Aug 2004 12:59:56 -0600
Cc: Stephen Hemminger <shemminger@xxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxx>, Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>, "Theodore Ts'o" <tytso@xxxxxxx>, netdev@xxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
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Mail-followup-to: Jean-Luc Cooke <jlcooke@xxxxxxxxxxxxxx>, Stephen Hemminger <shemminger@xxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxx>, Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>, Theodore Ts'o <tytso@xxxxxxx>, netdev@xxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
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On Aug 20, 2004  13:59 -0400, Jean-Luc Cooke wrote:
> Is there a reason why get_random_bytes() is unsuitable?
> 
> Keeping the number of PRNGs in the kernel to a minimum should a goal we can
> all share.

For some uses a decent PRNG is enough, and the overhead of get_random_bytes()
is much too high.  We've needed something like this for a long time (something
that gives decenly uniform numbers) and hacks to use useconds/cycles/etc do
not cut it.  I for one welcome a simple in-kernel interface to
e.g. get_urandom_bytes() (or net_random() as this is maybe inappropriately
called) that is only pseudo-random but fast and efficient.

Cheers, Andreas
--
Andreas Dilger
http://sourceforge.net/projects/ext2resize/
http://members.shaw.ca/adilger/             http://members.shaw.ca/golinux/

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