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

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Message-Id: <20170426182537.GX3956@linux.vnet.ibm.com>
Date:   Wed, 26 Apr 2017 11:25:38 -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 08:12:10PM +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).

Sounds good!  I think that validating a 75x reduction is good for 
today.  Get some rest!

> > Oh, and my I add your Tested-by?
> 
> Sure.

Done, thank you!

							Thanx, Paul