[Beowulf] x86-64 NUMA vs SMP kernel: appl. performance?

[Mikhail Kuzminsky]

In message from Reuti <reuti at staff.uni-marburg.de> (Fri, 24 Sep 2004 
20:43:28 +0200):
>Hi,
>> I have possible choice between using of SMP or NUMA-enabled x86_64 
>> kernels (2.4.21 from SuSE Linux 9.0 distributive). We use 2-way 
>for a good NUMA support you need a 2.6.x kernel.
>> Opteron-based nodes w/2 GBytes RAM per node (symmetrical DIMMs 
>> occupation).
>
>With symmetrical you mean 4 DIMMs in the machine, one for each 
>channel of the two CPUs?

I'm too late - here in Moscow was weekend, when I received "discussion
results" :-) . Yes, it means 1 512MB DIMM per each of 4 channels
(2 channels for each Opteron). 

>Some speed tests you can find here:
>http://www.gamepc.com/labs/view_content.asp?id=opteronmemory&page=1
>But I think real world tests are more interesting.
  Thanks, this data are very interesting also !

Yours
Mikhail