About the UltraSPARC T2plus memory controller discussion

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About the UltraSPARC T2plus memory controller discussion

Wednesday, April 16. 2008

This is really interesting in regard of the discussion about the reduced amount of memory controller in the UltraSPARC T2: Stream Benchmark Results on Sun SPARC Enterprise T5240 Server. On a two socket UltraSPARC T2plus systems the STREAMS TRIAD benchmark yields a result of 30 GB per second. On a single socket UltraSPARC T2 the same benchmark (executed by a customer) yields 16 GB/s. Obviously counting the amount of controller circuits isn´t enough to estimate the memory bandwidth a system is capable to use or to draw some more or less sensible conclusions out of it (as TPM tried to do).

Posted by Joerg Moellenkamp in English at 12:00 | Comments (4) | Trackbacks (0)

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Well then this is just a sign that T2 has a bottleneck somewhere in the core ... nothing to be proud of actually, though the bandwidth is still impressive

cheers

Alex

#1 Alex on 2008-04-16 15:16 (Reply)

No ... it´s a sign that UltraSPARC T2 had vastly to much memory bandwidth because of the last minute switch from DDR to FB ...

#1.1 Joerg+M. (Homepage) on 2008-04-16 15:40 (Reply)

so why did they switch to fbdimms anyways?

#2 Jonas+Lerch (Homepage) on 2008-04-17 02:28 (Reply)

The reason is simple: Pin count, thus making the packaging of the die and the routing on the board simpler.

As the prices for FBDIMMS dropped vastly at that time, using FBDIMM wasn´t a prohibitivly expensive option anymore.

#2.1 Joerg M. (Homepage) on 2008-04-17 06:42 (Reply)

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