netdev - Re: [PATCH] drivers/net: remove network drivers' last few uses of IRQF_SAMPLE

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Date:	Mon, 26 May 2008 17:52:27 -0400
From:	Bill Fink <billfink@...dspring.com>
To:	Krzysztof Halasa <khc@...waw.pl>
Cc:	Alejandro Riveira Fernández 
	<ariveira@...il.com>, Theodore Tso <tytso@....EDU>,
	Glen Turner <gdt@....id.au>,
	Chris Peterson <cpeterso@...terso.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	Jeff Garzik <jeff@...zik.org>,
	"Kok\, Auke" <auke-jan.h.kok@...el.com>,
	Rick Jones <rick.jones2@...com>,
	"Brandeburg\, Jesse" <jesse.brandeburg@...el.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers/net: remove network drivers' last few uses of
 IRQF_SAMPLE_RANDOM

On Mon, 26 May 2008, Krzysztof Halasa wrote:

> Bill Fink <billfink@...dspring.com> writes:
> 
> > Another idea that occured to me:  How about using the low order bits
> > of the instruction memory address being executed that was interrupted
> > by the HZ timer interrupt.
> 
> Think of constant-instructions-length processors :-)

I'm not sure what you're driving at, but if it's that you shouldn't
use the very last 2 or 3 bits, then sure those should be excluded.
But that still leaves 9 or 10 bits at least in the page offset, and
that's being conservative in the number of address bits to sample.

						-Bill
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