From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1165201AbdDXFY5 (ORCPT ); Mon, 24 Apr 2017 01:24:57 -0400 Received: from mout.gmx.net ([212.227.17.22]:53160 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1165197AbdDXFYu (ORCPT ); Mon, 24 Apr 2017 01:24:50 -0400 Message-ID: <1493011484.4166.13.camel@gmx.de> Subject: Re: TREE_SRCU slows hotplug by factor ~16 From: Mike Galbraith To: paulmck@linux.vnet.ibm.com Cc: LKML Date: Mon, 24 Apr 2017 07:24:44 +0200 In-Reply-To: <20170424033250.GX3956@linux.vnet.ibm.com> References: <1493002089.4145.7.camel@gmx.de> <20170424033250.GX3956@linux.vnet.ibm.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.16.5 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-Provags-ID: V03:K0:0aVyA0PPmkFeoH+TIggcJp+Jn7WQujJL0gI4nM/LJ5i7O819ebi Ug1LKNpAVVlBDQrDMSLQGL52e6fR6C29SuSSjs0K+0q8aFXw78arroOph6IWXfVpQn1piBq yzZuKWPZMOIXmhnEvZQNuTeZ3+awwF1ii4mnaQn0SXyzX8r4XJrq/rlYR9+DUsNkYuM4Pcm HhwDqnKvLPWPPOqSCX26A== X-UI-Out-Filterresults: notjunk:1;V01:K0:zw6Om/HZb1o=:e4WV/4TKebVX3xwH6I7/cD ljXohe/nwJtvn29S+25tNC4mYQX3Kgh6PtIdXTKoIeumU85vB94b0NPWxuHDKegjUk+fSw6d/ ssPjO0YxQcBK8fxeKA6i+OELyBXVK35TQOBefEZ/sKn4xdyDvPxi0bA9nkm0pPyOMKM/fHnyf vU8BbtJDIZ5P1YRy+QlKSHRQ2w2gA3/7F7TxMZT4Hu0E53WQJKL8533x1+Nc2nAvCFZlNjRz+ CaWM0VeU5WZONbcqP/bJTJGnhBIW8lOLR1/z19Wiq0LKCqcBzsvX63Mp34p0i0li5BGUQPHC3 Yr7dUKHlhL5YlCKcU7T06sdVxqAUl/XvudRfK6aYRMw/C04R3itxi+te6t3p/P2e5oRWmFMlW hP5lAJKVo8m/X79ZleDDGLSfgq1icVsjQXpZv2R9nduWeXrweoiO/UGZcncns3+ChmF+FOiYk u2+EfnZGjJ0wiCC1Itu4LOdQEjsXl6+65uzCWcmtuiro1VGstK2Oa+Hd20Y8795FRJTwlu22a CGKvzZs4lZhFbyqKfpSsqVWQtYQxZN4RVohPvER6jEWzpsclyrbR3v6XPyHvyHJbV33Zz27DM 2qTLtyCcK14WDGebXfcF7ld2SIQxGjjDgQPMk/y/n+k5NmZH5DWFf5Qs/nlP4P8TaUhQyAHCO QBD5LPjY7hUmdObeQ0ZH2CMBwgyST2IPz/UuArhPuL1Ah1POUJjH0WCeGE0yGr4RRq510ntqM 9hUkqxm5GpC3rODS6nb32GN9dmAtCU9c8JJAVjHzeogNZ0FXLzSQeu9+nvhvlka2cZwMJfnQc r4VRobZ Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 2017-04-23 at 20:32 -0700, Paul E. McKenney wrote: > On Mon, Apr 24, 2017 at 04:48:09AM +0200, Mike Galbraith wrote: > > Greetings, > > > > Running Steven's hotplug stress script in tip w. CLASSIC_SRCU takes 55s > > in my i4790 box, whereas TREE_SRCU takes over 16m. (Master with the > > same config does it in 39s.. but then lockdep isn't enabled in master) > > That doesn't sound good... > > But exactly which version are you using? There were some 8x slowdowns > earlier this week that have since been fixed. Also, how many CPUs are > on your system? 4 cores+SMT, tip.yesterday_afternoon (precise!) was initial test point, tip.this_morning (v4.11-rc7-955-g76f8909e1cd8) is still slow. -Mike