linux-kernel - Re: TREE_SRCU slows hotplug by factor ~16

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Message-Id: <20170426175610.GA6491@linux.vnet.ibm.com>
Date:   Wed, 26 Apr 2017 10:56:10 -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 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