[CentOS] maximum cpus/cores in CentOS 4.1

Lamar Owen lowen at pari.edu
Fri Sep 9 16:37:57 UTC 2005

On Friday 09 September 2005 12:21, Bryan J. Smith wrote:
> Do _not_ use the Xeon as an example of how a SPARC would
> perform versus the Opteron.

Since the Xeon will likely perform worse than an equivalent speed Opteron, 
this is a valid comparison, and it has nothing to do with interconnect.

> The Interconnect of the Xeon and 
> Opteron are extremely different!  So don't use them in the
> same context.

Why not?  Yes, they are different; why don't you stop assuming that people who 
use Opeteron and Xeon in the same sentence or paragraph are not as clueful as 
yourself?  I am fully aware of the differences and of the similarities in the 
Hammer versus Xeon architecture; yet, since I have no Opterons here (for 
servers, we buy Dell (for reasons other than raw performance), and Dell 
doesn't yet do Opteron), a simple comparison to a Xeon is the best I can do.  
I was very pleased at the donated E6500's performance.

> NOTE:  There is a major reason why Sun is switching to
> Opteron.  SPARC can't match it interconnect-wise, at least up
> to 8x S940.  Beyond 8x S940, things change.

There are other reasons, not the least of which is that SPARC is difficult to 
get increased clock speeds (hardware contexts, IIRC).  Hypertransport and UPA 
share many architectural similarities, though.
Lamar Owen
Director of Information Technology
Pisgah Astronomical Research Institute
1 PARI Drive
Rosman, NC  28772

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