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

Andy Isaacson
2007-08-14T19:11:59Z

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