From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753259AbaDOIM3 (ORCPT ); Tue, 15 Apr 2014 04:12:29 -0400 Received: from ipmail06.adl6.internode.on.net ([150.101.137.145]:8208 "EHLO ipmail06.adl6.internode.on.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753011AbaDOIMV (ORCPT ); Tue, 15 Apr 2014 04:12:21 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AtZeAGfpTFN5LEcvPGdsb2JhbABYgwaDUIULu1+BHxcDAQEBATg1giUBAQEEOhwVDhAIAxgJJQ8FJQMHLYd7zDIXFo5NBxaEIgSYYYpmiyMr Date: Tue, 15 Apr 2014 18:11:59 +1000 From: Dave Chinner To: linux-kernel@vger.kernel.org Cc: "H. Peter Anvin" Subject: Re: [regression, 3.15-rc1] vdso_gettimeofday hogs all my CPU Message-ID: <20140415081158.GK15995@dastard> References: <20140415075335.GE31578@dastard> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140415075335.GE31578@dastard> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Apr 15, 2014 at 05:53:36PM +1000, Dave Chinner wrote: > Hi Peter, > > I'm guessing that x86 vdso problems are in your area of expertise, > if not can you point me at the right person to bug? And you can ignore it. The VM wasn't running the kernel I thought it was - it was an old kernel from half way through last week. A 3.15-rc1 kernel, which I'm now testing, doesn't show the regression: FSUse% Count Size Files/sec App Overhead 0 1600000 0 281779.0 9964735 0 3200000 0 280343.0 10174512 0 4800000 0 268615.2 11330160 0 6400000 0 264782.4 11072193 ..... It shows all sorts of interesting new inode cache reclaim imbalances, but other than that the peak performance is back to normal... Sorry for the noise. Cheers, Dave. -- Dave Chinner david@fromorbit.com