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Re: TREE_SRCU slows hotplug by factor ~16

From "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Newsgroups linux.kernel
Subject Re: TREE_SRCU slows hotplug by factor ~16
Date 2017-04-26 20:00 +0200
Message-ID <tAzol-5vz-3@gated-at.bofh.it> (permalink)
References (5 earlier) <tAx3d-46S-37@gated-at.bofh.it> <tAxmy-4e9-27@gated-at.bofh.it> <tAxwf-4hS-49@gated-at.bofh.it> <tAzeG-5qR-7@gated-at.bofh.it> <tAzol-5vz-5@gated-at.bofh.it>
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On Wed, Apr 26, 2017 at 10:55:44AM -0700, Paul E. McKenney wrote:
> On Wed, Apr 26, 2017 at 07:45:57PM +0200, Mike Galbraith wrote:
> > On Wed, 2017-04-26 at 17:49 +0200, Mike Galbraith wrote:
> > > On Wed, 2017-04-26 at 08:44 -0700, Paul E. McKenney wrote:
> > 
> > > > Should I be comparing this with the 55s number from your initial email,
> > > > or to the 39s number?
> > > 
> > > Should be the 39...
> > 
> > And 39 it is.
> 
> Thank you again for your testing efforts!
> 
> 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.  ;-)

Oh, and my I add your Tested-by?

							Thanx, Paul

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Re: TREE_SRCU slows hotplug by factor ~16 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-26 00:40 +0200
  Re: TREE_SRCU slows hotplug by factor ~16 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-26 16:40 +0200
    Re: TREE_SRCU slows hotplug by factor ~16 Mike Galbraith <efault@gmx.de> - 2017-04-26 17:30 +0200
      Re: TREE_SRCU slows hotplug by factor ~16 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-26 17:50 +0200
        Re: TREE_SRCU slows hotplug by factor ~16 Mike Galbraith <efault@gmx.de> - 2017-04-26 18:00 +0200
          Re: TREE_SRCU slows hotplug by factor ~16 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-26 18:10 +0200
          Re: TREE_SRCU slows hotplug by factor ~16 Mike Galbraith <efault@gmx.de> - 2017-04-26 19:50 +0200
            Re: TREE_SRCU slows hotplug by factor ~16 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-26 20:00 +0200
              Re: TREE_SRCU slows hotplug by factor ~16 Mike Galbraith <efault@gmx.de> - 2017-04-26 20:20 +0200
                Re: TREE_SRCU slows hotplug by factor ~16 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-26 20:30 +0200
                Re: TREE_SRCU slows hotplug by factor ~16 Mike Galbraith <efault@gmx.de> - 2017-04-27 05:50 +0200
                Re: TREE_SRCU slows hotplug by factor ~16 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-27 06:20 +0200
                Re: TREE_SRCU slows hotplug by factor ~16 Mike Galbraith <efault@gmx.de> - 2017-04-27 06:20 +0200
                Re: TREE_SRCU slows hotplug by factor ~16 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-27 07:40 +0200
                Re: TREE_SRCU slows hotplug by factor ~16 Mike Galbraith <efault@gmx.de> - 2017-04-27 07:50 +0200
                Re: TREE_SRCU slows hotplug by factor ~16 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-27 14:40 +0200
            Re: TREE_SRCU slows hotplug by factor ~16 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-26 20:00 +0200

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