linux-kernel - Re: [PATCH 01/10] random: make 'add_interrupt

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Message-ID: <20120705232136.GD15685@thunk.org>
Date:	Thu, 5 Jul 2012 19:21:36 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
	w@....eu, ewust@...ch.edu, zakir@...ch.edu, greg@...ah.com,
	nadiah@...ucsd.edu, jhalderm@...ch.edu, tglx@...utronix.de,
	davem@...emloft.net, stable@...nel.org
Subject: Re: [PATCH 01/10] random: make 'add_interrupt_randomness()' do
 something sane

On Thu, Jul 05, 2012 at 05:31:22PM -0500, Matt Mackall wrote:
> On systems with a timer interrupt and a sched_clock() that's
> asynchronous to it, this actually loses a great source of entropy for
> headless systems. Also: extra branch in fast path.
> 
> It's better to mix and not credit than to not mix at all. Instead just
> check the fast count against HZ before the credit.

I'm not sure what you mean by this?

					- Ted
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