linux-kernel - Re: [RFC PATCH 0/5] CPU Jitter RNG

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Date:	Tue, 04 Feb 2014 13:47:47 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	"Theodore Ts'o" <tytso@....edu>,
	Stephan Mueller <smueller@...onox.de>,
	Jörn Engel <joern@...fs.org>,
	Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Dave Taht <dave.taht@...il.com>,
	John Crispin <blogic@...nwrt.org>,
	Andrew McGregor <andrewmcgr@...il.com>,
	Thorsten Glaser <tg@...bsd.de>, sandyinchina@...il.com
Subject: Re: [RFC PATCH 0/5] CPU Jitter RNG

On 02/04/2014 01:46 PM, Geert Uytterhoeven wrote:
> 
> Because they're fixed frequency, and used for communication with other
> devices, so accuracy matters?
> 
> Other clocks can be tuned for performance or power reasons, but clocks
> for communication must be fixed and stable. You can run e.g. your CPU
> or memory a bit slower or faster, but not your Ethernet.
> 

But modern frequency synthesizers can do that easily.

	-hpa


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