From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Wilcox Date: Tue, 12 Sep 2006 11:40:27 +0000 Subject: Re: [PATCH 5/6] Optional ZONE_DMA for x86_64 Message-Id: <20060912114027.GK29775@parisc-linux.org> List-Id: References: <20060911222755.4849.17749.sendpatchset@schroedinger.engr.sgi.com> In-Reply-To: <20060911222755.4849.17749.sendpatchset@schroedinger.engr.sgi.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org On Tue, Sep 12, 2006 at 08:40:22AM +0200, Andi Kleen wrote: > I think I would prefer to not make GFP_DMA32 optional. > Adding a 4GB limit CONFIG to a 64bit kernel just seems somewhat > dumb. Hmm? I would think that the majority of x86-64 users have <4GB. I bought an ASUS P5RD1-VM motherboard a few months ago which has 2 DIMM slots. Look at their list of 'hot' motherboards: http://usa.asus.com/products2.aspx?l1=3&l2 I don't see a single one with more than 4 slots. 2GB DIMMs are hovering around the $400 mark; I'm not convinced that your average user is spending $1200 on RAM at this point.