linux-kernel - Re: [v7 0/8] Reduce cross CPU IPI interference

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Message-ID: <20120209153730.GC22552@somewhere.redhat.com>
Date:	Thu, 9 Feb 2012 16:37:33 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Gilad Ben-Yossef <gilad@...yossef.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Avi Kivity <avi@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, Chris Metcalf <cmetcalf@...era.com>,
	linux-mm@...ck.org, Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>,
	Sasha Levin <levinsasha928@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Andi Kleen <andi@...stfloor.org>, Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Michal Nazarewicz <mina86@...a86.com>,
	Kosaki Motohiro <kosaki.motohiro@...il.com>,
	Milton Miller <miltonm@....com>
Subject: Re: [v7 0/8] Reduce cross CPU IPI interference

On Mon, Feb 06, 2012 at 12:19:44PM -0600, Christoph Lameter wrote:
> On Sun, 5 Feb 2012, Gilad Ben-Yossef wrote
> 
> >
> > Frederic has the latest version in a git tree here:
> >
> > git://github.com/fweisbec/linux-dynticks.git
> >        nohz/cpuset-v2-pre-20120117
> >
> > It's on top latest rcu/core.
> 
> Hmmm.. A pull vs upstream leads to lots of conflicts.

Yeah it's based on the latest rcu/core branch that was pulled
on last -rc1. Better git checkout it than pull.

 
> 
> > But the good news is that with these hacks applied I managed to run a 100%
> > CPU task  with  zero interrupts  (ticks or  otherwise) on an isolated cpu.
> 
> Cool.
> 
> > Disregarding TLB overhead, you get bare metal performance with Linux user
> > space manageability and  debug capabilities.  Pretty magical really: It's like
> > eating your cake and having it too :-)
> 
> We definitely need that.
> 
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