netdev - RE: Receive side performance issue with multi-10-GigE and NUMA

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Message-ID: <F169D4F5E1F1974DBFAFABF47F60C10A36523146@orsmsx507.amr.corp.intel.com>
Date:	Tue, 11 Aug 2009 17:02:57 -0700
From:	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>
To:	Bill Fink <billfink@...dspring.com>,
	Neil Horman <nhorman@...driver.com>
CC:	Andrew Gallatin <gallatin@...i.com>,
	Brice Goglin <Brice.Goglin@...ia.fr>,
	Linux Network Developers <netdev@...r.kernel.org>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>
Subject: RE: Receive side performance issue with multi-10-GigE and NUMA

Bill Fink wrote:
> On Sat, 8 Aug 2009, Neil Horman wrote:
> 
>> On Sat, Aug 08, 2009 at 02:21:36PM -0400, Andrew Gallatin wrote:
>>> Neil Horman wrote:
>>>> On Sat, Aug 08, 2009 at 07:08:20AM -0400, Andrew Gallatin wrote:
>>>>> Bill Fink wrote:
>>>>>> On Fri, 07 Aug 2009, Andrew Gallatin wrote:
>>>>>> 
>>>>>>> Bill Fink wrote:
>>>>>>> 
>>>>>>>> All sysfs local_cpus values are the same (00000000,000000ff),
>>>>>>>> so yes they are also wrong.

bill, I recently helped Jesse Barnes push a patch that addresses this kind
of issue on CoreI7, the root cause was the numa_node variable was
initialized based on slot on AMD systems, but needed to be set to -1 by
default on systems with a uniform IOH to slot architecture.

here is the commit ID:
http://git.kernel.org/?p=linux/kernel/git/sfr/linux-next.git;a=commit;h=3c38
d674be519109696746192943a6d524019f7f

I'm not sure it is in linus' tree yet, this link is to net-next

Maybe see if it helps?

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