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

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Message-ID: <4A7CA24E.4080503@inria.fr>
Date:	Fri, 07 Aug 2009 23:53:18 +0200
From:	Brice Goglin <Brice.Goglin@...ia.fr>
To:	Bill Fink <billfink@...dspring.com>
CC:	Linux Network Developers <netdev@...r.kernel.org>,
	Yinghai Lu <yhlu.kernel@...il.com>, gallatin@...i.com
Subject: Re: Receive side performance issue with multi-10-GigE and NUMA

Bill Fink wrote:
>> I've seen some cases in the past where numa_node was always 0 on
>> quad-Opteron machines with a PCI bus on node 1. IIRC it got fixed in
>> later kernels thanks to patches from Yinghai Lu (CC'ed).
>>     
>
> By later kernels do you mean 2.6.30 or 2.6.31?
>   

No, I meant "later than when the problem occured". I was using 2.6.22 at
this point and the problem was fixed somewhere around 2.6.25.

>> Is the corresponding local_cpus sysfs file wrong as well ?
>>     
>
> All sysfs local_cpus values are the same (00000000,000000ff),
> so yes they are also wrong.
>   

And hyperthreading is enabled, right?

Brice

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