[Beowulf] Nehalem memory configs

Jan Heichler jan.heichler at gmx.net
Wed Apr 8 12:55:48 PDT 2009

Hallo Peter,

Mittwoch, 8. April 2009, meintest Du:

PK> On Wednesday 08 April 2009, Joe Landman wrote:
>> As an FYI, Beowulf veteran Jeff Layton wrote up a nice article on memory
>> configuration issues for Nehalem (I had seen some discussion on this
>> previously).

PK> Can anyone confirm that mixing different sizes of dimms, even when keeping to
PK> a by-three-symmetric configuration, actually does degrade performance?

PK> That is, first hand information that config 1 will be slower than config 2:

PK> 1: two sockets, 3x 1G and 3x 2G per socket RDIMM (total 18G @1066)
PK> 2: two sockets, 6x 1G(or 2G) per socket RDIMM (total 12G (or 24G) @1066)

I was wondering about that too - especially since Intel is using config 1 in their benchmarking center...

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