linux-kernel - Re: Off topic: Numactl "distance" wrong

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Message-Id: <20090407111539.F0F5.A69D9226@jp.fujitsu.com>
Date:	Tue,  7 Apr 2009 11:52:56 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	kosaki.motohiro@...fujitsu.com, Yinghai Lu <yhlu.kernel@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	Chris Worley <worleys@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: Off topic: Numactl "distance" wrong

> That's not enough. You would need to redo all the zone fallback tables
> in the VM that are initialized based on topology, do new scheduler
> topologies and all kind of other stuff.

I think this is very good viewpoint.

The rebuilding zone fallback table and scheduler topologies need to add
new lock.

Oh well, who need memory and scheduler performance regression?
Then, its /sys interface isn't so useful.


I don't think the manual setting of node distance improve
opteron's (or another small machine) performance.



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