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

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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