From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andi Kleen Date: Thu, 08 Dec 2005 22:51:02 +0000 Subject: Re: [PATCH 1/3] Zone reclaim V3: main patch Message-Id: <20051208225102.GW11190@wotan.suse.de> List-Id: References: <20051208203707.30456.57439.sendpatchset@schroedinger.engr.sgi.com> <20051208210850.GS11190@wotan.suse.de> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Christoph Lameter Cc: Andi Kleen , akpm@osdl.org, Christoph Hellwig , linux-ia64@vger.kernel.org, steiner@sgi.com, linux-kernel@vger.kernel.org, Wu Fengguang , discuss@x86-64.org > For Altix 20 means that the other node is remote but in the same > enclosure / motherboard. Latency is very low in these cases. I think in > these small configurations it is better to go off node rather than using > the reclaim logic. On Opterons the NUMA factors are usually < 2, more towards 1, but people definitely note a difference between node and off node. So I don't think that's a good heuristic. I would use > LOCAL_DISTANCE or perhaps if you really want a new constant with value 12-15. > RECLAIM_DISTANCE can be set per arch if the default is not okay. Well if anything it would be per system - perhaps need to make it a boot option or somesuch later. -Andi