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Message-Id: <20090807180840.b27ce794.billfink@mindspring.com> 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 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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