Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S270975AbUJVDlk (ORCPT ); Thu, 21 Oct 2004 23:41:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S270974AbUJVDht (ORCPT ); Thu, 21 Oct 2004 23:37:49 -0400 Received: from smtp204.mail.sc5.yahoo.com ([216.136.130.127]:53666 "HELO smtp204.mail.sc5.yahoo.com") by vger.kernel.org with SMTP id S271013AbUJVDfb (ORCPT ); Thu, 21 Oct 2004 23:35:31 -0400 Message-ID: <41787FFF.9060502@yahoo.com.au> Date: Fri, 22 Oct 2004 13:35:27 +1000 From: Nick Piggin User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.2) Gecko/20040820 Debian/1.7.2-4 X-Accept-Language: en MIME-Version: 1.0 To: Andrew Morton CC: andrea@novell.com, linux-kernel@vger.kernel.org Subject: Re: ZONE_PADDING wastes 4 bytes of the new cacheline References: <20041021011714.GQ24619@dualathlon.random> <417728B0.3070006@yahoo.com.au> <20041020213622.77afdd4a.akpm@osdl.org> <417837A7.8010908@yahoo.com.au> <20041021224533.GB8756@dualathlon.random> <41785585.6030809@yahoo.com.au> <20041022011057.GC14325@dualathlon.random> <20041021182651.082e7f68.akpm@osdl.org> <417879FB.5030604@yahoo.com.au> <20041021202656.08788551.akpm@osdl.org> In-Reply-To: <20041021202656.08788551.akpm@osdl.org> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1073 Lines: 31 Andrew Morton wrote: > Nick Piggin wrote: > >>Andrew Morton wrote: >> >>I think they probably should be turned on. A system with a gig of ram >>shouldn't be able to use up all of ZONE_DMA on pagecache. It seems like >>a small price to pay... same goes for very big highmem systems and ZONE_NORMAL. > > > Problem is, how much lower zone memory do you reserve? If someone is > really getting hit by this in real life then the answer for their workload > is probably "lots". If they are not getting hit then the answer is "none". > Yeah you might be right... although the ZONE_NORMAL can still be used for other things like slab caches. > Any halfway setting will screw everyone. > > I guess what we really need to do is find someone who is getting hit by it. Andrea do you have any pointers? - 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/