linux-kernel - Re: IRQF_SAMPLE

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Message-ID: <49DD3036.4020107@nortel.com>
Date:	Wed, 08 Apr 2009 17:16:06 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Gilles Espinasse <g.esp@...e.fr>
CC:	Robin Getz <rgetz@...ckfin.uclinux.org>,
	Chris Peterson <cpeterso@...terso.com>,
	Matt Mackall <mpm@...enic.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: IRQF_SAMPLE_RANDOM question...

Gilles Espinasse wrote:

> Readme say :
> "This daemon attempts to collect real randomness from fluctuations of
> high-frequency clocks on a PC's mainboard. The basic assumption is that
> mainboard and CPU are clocked by two separate physical clocks."

> How large is this basic assumption true, on x86, on other arch?

Isn't the cpu frequency normally a phase-locked multiple of the 
mainboard bus frequency?

Chris
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