Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934778AbXHMXUo (ORCPT ); Mon, 13 Aug 2007 19:20:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759328AbXHMXUe (ORCPT ); Mon, 13 Aug 2007 19:20:34 -0400 Received: from mx2.suse.de ([195.135.220.15]:47098 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754243AbXHMXUd (ORCPT ); Mon, 13 Aug 2007 19:20:33 -0400 Date: Tue, 14 Aug 2007 02:14:41 +0200 From: Andi Kleen To: Alan Cox Cc: Andi Kleen , Christoph Lameter , Mel Gorman , Lee.Schermerhorn@hp.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 3/4] Embed zone_id information within the zonelist->zones pointer Message-ID: <20070814001441.GN3406@bingen.suse.de> References: <20070813225020.GE3406@bingen.suse.de> <20070813225841.GG3406@bingen.suse.de> <20070813230801.GH3406@bingen.suse.de> <20070813234322.GJ3406@bingen.suse.de> <20070814000041.GL3406@bingen.suse.de> <20070814002223.2d8d42c5@the-village.bc.nu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070814002223.2d8d42c5@the-village.bc.nu> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1281 Lines: 34 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. s390 won't change. That only leaves lance. If it runs in a system with <= 16MB of memory is fine. I checked with David if he would consider adding a second destructor to the skb for this case and he said no. Which was an answer which was fine for m.e So the only systems really affected are lance systems with >16MB. I don't think we can stop Linux evolution for those sorry. They'll just have to live with it. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/