linux-kernel - Re: [PATCH 0/3] Unmapped page cache control (v5)

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Message-ID: <alpine.DEB.2.00.1104031342540.15317@router.home>
Date:	Sun, 3 Apr 2011 13:45:15 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	Balbir Singh <balbir@...ux.vnet.ibm.com>, linux-mm@...ck.org,
	akpm@...ux-foundation.org, npiggin@...nel.dk, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, kamezawa.hiroyu@...fujitsu.com,
	Mel Gorman <mel@....ul.ie>, Minchan Kim <minchan.kim@...il.com>
Subject: Re: [PATCH 0/3] Unmapped page cache control (v5)

On Sun, 3 Apr 2011, KOSAKI Motohiro wrote:

> 1) Some bios don't have such knob. btw, OK, yes, *I* can switch NUMA off completely
> because I don't have such bios. 2) bios level turning off makes some side effects,
> example, scheduler load balancing don't care numa anymore.

Well then lets add a kernel parameter that switches all NUMA off.
Otherwise: If you just run a kernel build without NUMA support then you have a similar
effect.

Re #2) If you have the system toss processes around the system then the
load balancing heuristics does not bring you any benefit.


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