From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751416AbaHPHkf (ORCPT ); Sat, 16 Aug 2014 03:40:35 -0400 Received: from mail-lb0-f181.google.com ([209.85.217.181]:50933 "EHLO mail-lb0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751084AbaHPHke (ORCPT ); Sat, 16 Aug 2014 03:40:34 -0400 Message-ID: <1408174826.5575.33.camel@marge.simpson.net> Subject: Re: [PATCH 2/7] locking/rwsem: more aggressive use of optimistic spinning From: Mike Galbraith To: Waiman Long Cc: Dave Chinner , Jason Low , Ingo Molnar , Peter Zijlstra , linux-kernel@vger.kernel.org, Davidlohr Bueso , Scott J Norton Date: Sat, 16 Aug 2014 09:40:26 +0200 In-Reply-To: <53EE4A31.5080407@hp.com> References: <1407119782-41119-1-git-send-email-Waiman.Long@hp.com> <1407119782-41119-3-git-send-email-Waiman.Long@hp.com> <1407125450.4710.38.camel@j-VirtualBox> <53DFAA53.4010003@hp.com> <20140813055153.GD20518@dastard> <53EB9522.2070804@hp.com> <20140815033447.GJ20518@dastard> <53EE4A31.5080407@hp.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2014-08-15 at 13:58 -0400, Waiman Long wrote: > Thank for the testing recipe. I am afraid that I can't find a 500TB SSD > for testing purpose. Do you think the test will still be valid for > exercising rwsem if I use a smaller SSD or maybe mechanical hard disk? I suspect fs_mark will fit in less than a cubic meter of silicon. You definitely don't want to use a 400GB USB2 drive to find out though. FSUse% Count Size Files/sec App Overhead 0 800000 0 22474.9 5551907 0 1600000 0 1550.0 314304154 0 2400000 0 832.3 928216719 zzzzz... nope, nobody is _that_ bored ^C (starts xfs_repair, perf top.. snort) Nope, you definitely don't want USB2 crapware for that either :) -Mike