netdev - Re: hackbench regression due to commit 9dfc6e68bfe6e

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Date:	Thu, 08 Apr 2010 09:54:32 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	netdev <netdev@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
	alex.shi@...el.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Ma, Ling" <ling.ma@...el.com>,
	"Chen, Tim C" <tim.c.chen@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: hackbench regression due to commit 9dfc6e68bfe6e

Le jeudi 08 avril 2010 à 15:54 +0800, Zhang, Yanmin a écrit :

> If there are 2 nodes in the machine, processes on node 0 will contact MCH of
> node 1 to access memory of node 1. I suspect the MCH of node 1 might enter
> a power-saving mode when all the cpus of node 1 are free. So the transactions
> from MCH 1 to MCH 0 has a larger latency.
> 

Hmm, thanks for the hint, I will investigate this.


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