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

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Message-ID: <1493221799.6176.5.camel@gmx.de>
Date:   Wed, 26 Apr 2017 17:49:59 +0200
From:   Mike Galbraith <efault@....de>
To:     paulmck@...ux.vnet.ibm.com
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: Re: TREE_SRCU slows hotplug by factor ~16

On Wed, 2017-04-26 at 08:44 -0700, Paul E. McKenney wrote:
> On Wed, Apr 26, 2017 at 05:26:20PM +0200, Mike Galbraith wrote:
> > On Wed, 2017-04-26 at 07:31 -0700, Paul E. McKenney wrote:
> > 
> > > And a sneak preview, semi-tested.  If you get a chance to run this, please
> > > let me know now it goes.
> > 
> > That took 'time stress-cpu-hotplug.sh' down to 48s, close to classic.
> 
> Woo-hoo!!!  ;-)
> 
> And thank you for your testing efforts!
> 
> Should I be comparing this with the 55s number from your initial email,
> or to the 39s number?

Should be the 39, but I'll get you a new tree vs classic number in this
same tree after I finish bisecting TSC going wonky.

	-Mike