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Date: Wed, 26 Apr 2017 21:11:36 -0700 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: Mike Galbraith <efault@....de> Cc: LKML <linux-kernel@...r.kernel.org> Subject: Re: TREE_SRCU slows hotplug by factor ~16 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
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