linux-kernel - Re: [PATCH 3/4] Embed zone_id information within the zonelist->zones pointer

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Date:	Tue, 14 Aug 2007 12:11:59 -0700
From:	Andy Isaacson <adi@...apodia.org>
To:	Andi Kleen <ak@...e.de>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Christoph Lameter <clameter@....com>,
	Mel Gorman <mel@...net.ie>, Lee.Schermerhorn@...com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-mips@...ux-mips.org
Subject: Re: [PATCH 3/4] Embed zone_id information within the zonelist->zones pointer

On Tue, Aug 14, 2007 at 02:14:41AM +0200, Andi Kleen wrote:
> On Tue, Aug 14, 2007 at 12:22:23AM +0100, Alan Cox wrote:
> > > The only tricky part were skbs in a few drivers, but luckily they are only
> > > needed for bouncing which can be done without a skb too. For RX it adds
> > > one copy, but we can live with that because they're only slow devices.
> > 
> > Usually found on slow hardware that can't cope with extra copies very
> > well.
> 
> It's essentially only lance, meth, b44 and bcm43xx and lots of s390.
> 
> meth is only used on SGI O2s which are not that slow and unlikely
> to work in tree anyways.
> 
> b44 and bcm43xx run in fast enough new systems to have no trouble
> with copies.

bcm43xx hardware does show up on low-end MIPS boxes (wrt54g anybody?)
that would be sorely hurt by excess copies.

-andy
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