From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752308AbdD0ELt (ORCPT ); Thu, 27 Apr 2017 00:11:49 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:38592 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752066AbdD0ELl (ORCPT ); Thu, 27 Apr 2017 00:11:41 -0400 Date: Wed, 26 Apr 2017 21:11:36 -0700 From: "Paul E. McKenney" To: Mike Galbraith Cc: LKML Subject: Re: TREE_SRCU slows hotplug by factor ~16 Reply-To: paulmck@linux.vnet.ibm.com References: <20170425223642.GA10931@linux.vnet.ibm.com> <20170426143145.GA5683@linux.vnet.ibm.com> <1493220380.6176.2.camel@gmx.de> <20170426154402.GT3956@linux.vnet.ibm.com> <1493221799.6176.5.camel@gmx.de> <1493228757.4132.2.camel@gmx.de> <20170426175544.GW3956@linux.vnet.ibm.com> <20170426175610.GA6491@linux.vnet.ibm.com> <1493230330.4132.4.camel@gmx.de> <1493264639.4154.10.camel@gmx.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1493264639.4154.10.camel@gmx.de> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-GCONF: 00 x-cbid: 17042704-0044-0000-0000-0000031787C2 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00006980; HX=3.00000240; KW=3.00000007; PH=3.00000004; SC=3.00000208; SDB=6.00853030; UDB=6.00421716; IPR=6.00631866; BA=6.00005313; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00015201; XFM=3.00000013; UTC=2017-04-27 04:11:38 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17042704-0045-0000-0000-000007458FD1 Message-Id: <20170427041136.GA3956@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-04-27_03:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1703280000 definitions=main-1704270062 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Apr 27, 2017 at 05:43:59AM +0200, Mike Galbraith wrote: > On Wed, 2017-04-26 at 20:12 +0200, Mike Galbraith wrote: > > On Wed, 2017-04-26 at 10:56 -0700, Paul E. McKenney wrote: > > > > > > OK, I do need to do more work. My current guess is that I should have > > > > set the default for srcutree.exp_holdoff to 25*1000 instead of 50*1000. > > > > But I am sure that further data will show me the error of my ways. ;-) > > > > I can give that a go tomorrow (too crispy now). > > real 0m39.177s > user 0m0.225s > sys 0m5.344s > > tadaaa (tricorder noises... it's dead Jim) This is with srcutree.exp_holdoff set to 25*1000? If so, great news! Really easy to adjust the default. ;-) Thanx, Paul