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In regard to: Re: [Linux-PowerEdge] R6515 with unbalanced memory config?,...:
On 7/13/20 3:18 PM, Tim Mooney wrote:
But the full whitepaper is no longer present on Dell's download site.
Even finding the 1 page
http://downloads.dell.com/manuals/common/Direct_from_Development_-_Balanced_Memory_on_2nd_Generation_AMD_EPYC_Processors_Reference_Guide.pdf
Still links to the full whitepaper under a download URL that no longer
works.
Anyone know either where the full whitepaper can be found or what kind of
performance penalty we're looking at for this type of NUMA memory config?
FWIW, i strongly deter any of my users from configuring a machine that's not
fully "balanced".
Unfortunately, that's hard here on the Epyc Gen II where you have to use 8
DIMMs and 8GB is the smallest.
(so a 2P server has at least 128GB of RAM, even if you don't need it)
That will indeed limit the usefulness of these systems for some of the
purposes we might otherwise have put them to.
Amazingly the site is not hiding dirindexes, so, just head on over to:
https://downloads.dell.com/manuals/common/
I noticed that too, but hadn't managed to find the actual whitepaper:
https://downloads.dell.com/manuals/common/dellemc-balanced-memory-2ndgen-amd-epyc-poweredge.pdf
Thanks for finding that!
The Epyc "Chiplet" arrangement makes things even more weird for configuring
systems.
I haven't read the WP yet, but thanks for pointing it out.
The chart (for R6525, I'm working with R6515) on page 10 is both helpful
and a little strange. The "near optimal" 4 DIMM option doesn't look too
"near" optimal.
Thanks much for your response.
Tim
--
Tim Mooney [email protected]
Enterprise Computing & Infrastructure /
Division of Information Technology / 701-231-1076 (Voice)
North Dakota State University, Fargo, ND 58105-5164
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