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Discussion on Article:
Server Platforms Today

Started by: Andrzej | Date 04/30/04 01:55:35 AM
Comments: 20 | Last Comment:  08/25/06 10:55:51 AM

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1. 
Very good article.

Comparative SpecInt
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Very few, if any, servers have one processor, and the importance of scalability as your article describes. I would have liked to see multiprocessor SpecInt comparison as this would have given an indication of the comparative scalability. Perhaps a four processor SpecInt comparison would have been usefull as all server CPU's designs should be scalable to at least 4.

I/O
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Another inportant feature of any server is the I/O performance/bandwidth supported by the associated shipset - I assume all chipsets today support PCI-X - but at what speed?
0 0 [Posted by:  | Date: 05/03/04 04:51:03 PM]
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2. 
Are we supposed to be awed by the Itanium 6.4 GB/sec bandwidth bus that has to be shared by 4 CPUs? Any P4 with 800 FSB had that bandwidth a year ago in a single CPU system! The 4-way HP DL685 Opteron server has 17 GB/s (PC2100) or 21 GB/s (PC2700) of memory bandwidth available. Plus the HT links have spare bandwidth available for I/O and cache coherency snooping transactions. This is actual bandwidth to the CPUs, not some phony 12.8 GB/s memory bandwidth connected to a puny 6.4 GB/s bus to the CPUs.

The low Itanium 2 memory bandwidth illustrates the fact that this system was designed in the stone age, when people thought 6.4 GB/s would be enough. Its not, and Opteron will soon see its HT bus speeds increase by 25% while Intel stands still because of its commitment to keep the Itanium platform stable.
0 0 [Posted by:  | Date: 05/04/04 03:30:32 PM]
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