From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 26 Apr 2007 08:46:35 -0700 (PDT) From: Christoph Lameter Subject: Re: [PATCH] change global zonelist order on NUMA v2 In-Reply-To: <200704261147.44413.ak@suse.de> Message-ID: References: <20070426183417.058f6f9e.kamezawa.hiroyu@jp.fujitsu.com> <200704261147.44413.ak@suse.de> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Andi Kleen Cc: KAMEZAWA Hiroyuki , LKML , Linux-MM , AKPM List-ID: On Thu, 26 Apr 2007, Andi Kleen wrote: > On Thursday 26 April 2007 11:34:17 KAMEZAWA Hiroyuki wrote: > > > > Changelog from V1 -> V2 > > - sysctl name is changed to be relaxed_zone_order > > - NORMAL->NORMAL->....->DMA->DMA->DMA order (new ordering) is now default. > > NORMAL->DMA->NORMAL->DMA order (old ordering) is optional. > > - addes boot opttion to set relaxed_zone_order. ia64 is supported now. > > - Added documentation > > > > patch is against 2.6.21-rc7-mm2. tested on ia64 NUMA box. works well. > > IMHO the change should be default (without any options) unless someone > can come up with a good reason why not. On x86-64 it should be definitely > default. It is not a good idea if node 0 has both DMA and NORMAL memory and normal memory is a small fraction of node memory. In that case lots of allocations get redirected to node 1. > If there is a good reason on some architecture or machine a user option is also not a > good idea, but instead it should be set automatically by that architecture or machine > on boot. Right. That was my thinking. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org