Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 7 Dec 2001 21:09:04 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 7 Dec 2001 21:08:57 -0500 Received: from neon-gw-l3.transmeta.com ([63.209.4.196]:38406 "EHLO neon-gw.transmeta.com") by vger.kernel.org with ESMTP id ; Fri, 7 Dec 2001 21:08:40 -0500 Message-ID: <3C117612.4060904@zytor.com> Date: Fri, 07 Dec 2001 18:08:18 -0800 From: "H. Peter Anvin" Organization: Zytor Communications User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.4) Gecko/20010913 X-Accept-Language: en, sv MIME-Version: 1.0 To: mjustice@austin.rr.com CC: Jens Axboe , linux-kernel@vger.kernel.org Subject: Re: highmem question In-Reply-To: <01120719534703.00764@bozo> <20011208015446.GC32569@suse.de> <01120720102404.00764@bozo> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Marvin Justice wrote: >>That's because of highmem page bouncing when doing I/O. There is indeed >>a solution for this -- 2.5 or 2.4 + block-highmem-all patches will >>happily do I/O directly to any page in your system as long as your >>hardware supports it. I'm sure we're beating w2k with that enabled :-) >> > > Will your patch lead to better performance than the CONFIGH_HIGHMEM=n case? > Unfortunately, W2K with any amount of memory beat Linux with no highmem (see > http://www.uwsg.indiana.edu/hypermail/linux/kernel/0110.3/0375.html ) so my > PHB decided to hold off on Linux for now. > Depends if you need the extra memory or not. -hpa - 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/