Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753881Ab0DENzj (ORCPT ); Mon, 5 Apr 2010 09:55:39 -0400 Received: from nlpi157.sbcis.sbc.com ([207.115.36.171]:53818 "EHLO nlpi157.prodigy.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751444Ab0DENzf (ORCPT ); Mon, 5 Apr 2010 09:55:35 -0400 Date: Mon, 5 Apr 2010 08:54:49 -0500 (CDT) From: Christoph Lameter X-X-Sender: cl@router.home To: "Zhang, Yanmin" cc: alex.shi@intel.com, "linux-kernel@vger.kernel.org" , "Ma, Ling" , "Chen, Tim C" , Tim C , Pekka Enberg , Andrew Morton Subject: Re: hackbench regression due to commit 9dfc6e68bfe6e In-Reply-To: <1270195589.2078.116.camel@ymzhang.sh.intel.com> Message-ID: References: <1269506457.4513.141.camel@alexs-hp.sh.intel.com> <1269570902.9614.92.camel@alexs-hp.sh.intel.com> <1270114166.2078.107.camel@ymzhang.sh.intel.com> <1270195589.2078.116.camel@ymzhang.sh.intel.com> 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: 755 Lines: 19 On Fri, 2 Apr 2010, Zhang, Yanmin wrote: > My testing command on my 2 socket machine: > #hackbench 100 process 20000 > > With 2.6.33, it takes for about 96 seconds while 2.6.34-rc2 (or the latest tip tree) > takes for about 101 seconds. > > perf shows some functions around SLUB have more cpu utilization, while some other > SLUB functions have less cpu utilization. Hmnmmm... The dynamic percpu areas use page tables and that data is used in the fast path. Maybe the high thread count causes tlb trashing? -- 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/