Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932728Ab0DHPhk (ORCPT ); Thu, 8 Apr 2010 11:37:40 -0400 Received: from nlpi157.sbcis.sbc.com ([207.115.36.171]:38412 "EHLO nlpi157.prodigy.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753954Ab0DHPhh (ORCPT ); Thu, 8 Apr 2010 11:37:37 -0400 Date: Thu, 8 Apr 2010 10:34:07 -0500 (CDT) From: Christoph Lameter X-X-Sender: cl@router.home To: Eric Dumazet cc: "Zhang, Yanmin" , Pekka Enberg , netdev , Tejun Heo , alex.shi@intel.com, "linux-kernel@vger.kernel.org" , "Ma, Ling" , "Chen, Tim C" , Andrew Morton Subject: Re: hackbench regression due to commit 9dfc6e68bfe6e In-Reply-To: <1270705153.8141.58.camel@edumazet-laptop> Message-ID: References: <1270705153.8141.58.camel@edumazet-laptop> User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 975 Lines: 37 On Thu, 8 Apr 2010, Eric Dumazet wrote: > I suspect NUMA is completely out of order on current kernel, or my > Nehalem machine NUMA support is a joke > > # numactl --hardware > available: 2 nodes (0-1) > node 0 size: 3071 MB > node 0 free: 2637 MB > node 1 size: 3062 MB > node 1 free: 2909 MB How do the cpus map to the nodes? cpu 0 and 1 both on the same node? > # ./try.sh > Running with 50*40 (== 2000) tasks. > Time: 16.865 > node0 results > Running with 25*40 (== 1000) tasks. > Time: 16.767 > node1 results > Running with 25*40 (== 1000) tasks. > Time: 16.564 > node0 on mem1 results > Running with 25*40 (== 1000) tasks. > Time: 16.814 > node1 on mem0 results > Running with 25*40 (== 1000) tasks. > Time: 16.896 > > > -- 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/