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Date: Mon, 12 Apr 2010 08:49:40 +0200
From: Ingo Molnar <mingo@elte.hu>
Subject: Re: [PATCH 00 of 41] Transparent Hugepage Support #17
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To: Nick Piggin <npiggin@suse.de>
Cc: Avi Kivity <avi@redhat.com>, Mike Galbraith <efault@gmx.de>, Jason Garrett-Glaser <darkshikari@gmail.com>, Andrea Arcangeli <aarcange@redhat.com>, Linus Torvalds <torvalds@linux-foundation.org>, Pekka Enberg <penberg@cs.helsinki.fi>, Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org, Marcelo Tosatti <mtosatti@redhat.com>, Adam Litke <agl@us.ibm.com>, Izik Eidus <ieidus@redhat.com>, Hugh Dickins <hugh.dickins@tiscali.co.uk>, Rik van Riel <riel@redhat.com>, Mel Gorman <mel@csn.ul.ie>, Dave Hansen <dave@linux.vnet.ibm.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Mike Travis <travis@sgi.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Christoph Lameter <cl@linux-foundation.org>, Chris Wright <chrisw@sous-sol.org>, bpicco@redhat.com, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Balbir Singh <balbir@linux.vnet.ibm.com>, Arnd Bergmann <arnd@arndb.de>, "Michael S. Tsirkin" <mst@redhat.com>, Peter Zijlstra <peterz@infradead.org>, Johannes Weiner <hannes@cmpxchg.org>, Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
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* Nick Piggin <npiggin@suse.de> wrote:

> [...]
> 
> Just running a few minutes of testing with a kernel compile in the 
> background does not show the full picture. You really need a box that has 
> been up for days running a proper workload before you are likely to see any 
> breakdown.

AFAIK that's what Andrea has done as a test - but yes, i agree that 
fragmentation is the main design worry.

	Ingo

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