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Date: Sat, 17 Apr 2010 22:05:31 +0300
From: Avi Kivity <avi@redhat.com>
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Subject: Re: hugepages will matter more in the future
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To: Arjan van de Ven <arjan@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>, Jason Garrett-Glaser <darkshikari@gmail.com>, Mike Galbraith <efault@gmx.de>, 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>, Nick Piggin <npiggin@suse.de>, 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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On 04/17/2010 10:05 PM, Arjan van de Ven wrote:
> On Sat, 17 Apr 2010 21:18:12 +0300
>    
>> Correct.  We're trying to reduce suckage from 2 cache misses per
>> access (3 for virt), to 1 cache miss per access.  We're also freeing
>> up space in the cache for data.
>>
>> Saying the application already sucks isn't helping anything.
>>      
> but the guy who's writing the application will already optimize for
> this case...
>    

I lost you.  What is he optimizing for?  4k pages?

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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