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

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Date:	Fri, 7 Aug 2009 18:08:40 -0400
From:	Bill Fink <billfink@...dspring.com>
To:	Brice Goglin <Brice.Goglin@...ia.fr>
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

On Fri, 07 Aug 2009, Brice Goglin wrote:

> 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.

OK.  The tests were run on a 2.6.29.6 kernel so presumably should
have included the fix you mentioned.

> >> 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?

No, hyperthreading is disabled.  It's a dual quad-core system so there
are a total of 8 cores, 4 on NUMA node 0 and 4 on NUMA node2.

						-Thanks

						-Bill
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