netdev - Re: [GIT PULL] AlacrityVM guest drivers for 2.6.33

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Message-ID: <873a31cvvn.fsf@basil.nowhere.org>
Date:	Wed, 23 Dec 2009 20:50:52 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	"Ira W. Snyder" <iws@...o.caltech.edu>
Cc:	Gregory Haskins <gregory.haskins@...il.com>,
	Kyle Moffett <kyle@...fetthome.net>,
	Ingo Molnar <mingo@...e.hu>, Avi Kivity <avi@...hat.com>,
	kvm@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org,
	"alacrityvm-devel@...ts.sourceforge.net" 
	<alacrityvm-devel@...ts.sourceforge.net>
Subject: Re: [GIT PULL] AlacrityVM guest drivers for 2.6.33

"Ira W. Snyder" <iws@...o.caltech.edu> writes:

> (You'll quickly find that you must use DMA to transfer data across PCI.
> AFAIK, CPU's cannot do burst accesses to the PCI bus. I get a 10+ times

AFAIK that's what write-combining on x86 does. DMA has other
advantages of course.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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