ADSM-L

Re: [ADSM-L] 7500 Mb/s on 10 GbE!

2007-10-19 10:33:04
Subject: Re: [ADSM-L] 7500 Mb/s on 10 GbE!
From: Richard Sims <rbs AT BU DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Fri, 19 Oct 2007 10:31:27 -0400
On Oct 18, 2007, at 10:43 PM, Kauffman, Tom wrote:

The PCI bus on a P5 will saturate at 400 MB/Sec; you'll need to go to
the P6 to exceed that. That, and the $8,000  per end cost are the
reasons I have 4 independent gigabit backup networks. (At the lat
time I
looked, the IBM card was $8,000 and a populated 8-port board for our
Cisco switch was $64,000, with the per-port cost getting uglier as you
cut the ports down).

Configuring a computer can involve a lot of art and science.  What co-
resides on the bus can greatly influence the throughput of what you
thought would be a very fast interface care.  For example, PCI-X
buses run only as fast as the slowest device on the bus; and they run
at half-duplex.  PCI-Express, a wholly different animal, is
architected for serial transmission, rather than the horse-race
parallel of its predecessors, and runs full-duplex.  And, a given
computer may contain two different bus types, to accommodate
technology transitions in force at the time of design.  Many are the
factors in what your computer can do for you, and where mysterious
performance drags come from.

   Richard Sims

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