linux-kernel - Re: Benchmark results: "Enhanced NUMA scheduling with adaptive affinity"

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Message-ID: <20121116174918.GA4723@gmail.com>
Date:	Fri, 16 Nov 2012 18:49:18 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Paul Turner <pjt@...gle.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Christoph Lameter <cl@...ux.com>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Benchmark results: "Enhanced NUMA scheduling with adaptive
 affinity"


* Mel Gorman <mgorman@...e.de> wrote:

> On Fri, Nov 16, 2012 at 04:56:26PM +0100, Ingo Molnar wrote:
> > 
> > * Mel Gorman <mgorman@...e.de> wrote:
> > 
> > > It is important to know how this was configured. I was running 
> > > one JVM per node and the JVMs were sized that they should fit 
> > > in the node. [...]
> > 
> > That is not what I tested: as I described it in the mail I 
> > tested 32 warehouses: i.e. spanning the whole system.
> > 
> 
> Good (sortof) [...]

Not just 'sortof' good but it appears it's unconditionally good: 
meanwhile other testers have reproduced the single-JVM speedup 
with the latest numa/core code as well, so the speedup is not 
just on my system.

Please post your kernel .config so I can check why the 4x JVM 
test does not perform so well on your system. Maybe there's 
something special to your system.

Thanks,

	Ingo
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