Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758568Ab3HOPOb (ORCPT ); Thu, 15 Aug 2013 11:14:31 -0400 Received: from mga01.intel.com ([192.55.52.88]:31373 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755151Ab3HOPO2 (ORCPT ); Thu, 15 Aug 2013 11:14:28 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.89,885,1367996400"; d="scan'208";a="381430010" Message-ID: <520CF04D.7020002@linux.intel.com> Date: Thu, 15 Aug 2013 08:14:21 -0700 From: Dave Hansen User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130803 Thunderbird/17.0.8 MIME-Version: 1.0 To: "Theodore Ts'o" , Andy Lutomirski , linux-fsdevel@vger.kernel.org, xfs@oss.sgi.com, linux-ext4@vger.kernel.org, Jan Kara , LKML , david@fromorbit.com, Tim Chen , Andi Kleen Subject: Re: page fault scalability (ext3, ext4, xfs) References: <520BB9EF.5020308@linux.intel.com> <20130814194359.GA22316@thunk.org> <520BED7A.4000903@intel.com> <20130814230648.GD22316@thunk.org> <20130815011101.GA3572@thunk.org> In-Reply-To: <20130815011101.GA3572@thunk.org> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1006 Lines: 22 On 08/14/2013 06:11 PM, Theodore Ts'o wrote: > The point is that if the goal is to measure page fault scalability, we > shouldn't have this other stuff happening as the same time as the page > fault workload. will-it-scale does several different tests probing at different parts of the fault path: https://www.sr71.net/~dave/intel/willitscale/systems/bigbox/3.11.0-rc2-dirty/foo.html It does that both for process and threaded workloads which lets it get pretty good coverage of different areas of code. I only posted data from half of one of these tests here because it was the only one that I found that both had noticeable overhead in the filesystem code. It also showed substantial, consistent, and measurable deltas between the different filesystems. -- 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/