Date: Mon, 6 Feb 2012 12:19:44 -0600 (CST)
From: Christoph Lameter <cl@linux.com>
To: Gilad Ben-Yossef <gilad@benyossef.com>
cc: "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>,
        Frederic Weisbecker <fweisbec@gmail.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>
Subject: Re: [v7 0/8] Reduce cross CPU IPI interference
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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.


> 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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