Recommended PCI gigabit ethernet card? OT: PC Gigabit Through putQuestion

[Flaherty, Patrick]

Somebody broke out the slide rule -=]

patrick 

-----Original Message-----
From: gnhlug-discuss-bounces at mail.gnhlug.org
[mailto:gnhlug-discuss-bounces at mail.gnhlug.org] On Behalf Of Michael
ODonnell
Sent: Thursday, June 14, 2007 4:18 PM
To: gnhlug-discuss at mail.gnhlug.org
Subject: Re: Recommended PCI gigabit ethernet card? OT: PC Gigabit
Through putQuestion



PCI-32 theoretical maximum throughput would be:

   (((33 million cycles) * 32 bits) / 8 = 132 million bytes ) per second

...but since that's unattainable for more than a dozen ticks or so I'm
guessing that 2/3 of that (88 million) is a more reasonable maximum.

Meanwhile, I (think I) have heard that the rule-of-thumb for Enet
overhead is something like:

   bitrate / 12 = bytes-per-second

...so for GigE we'd get:

   ~1,000,000,000 bits per second / 12 = ~83,333,333

...which is in the same ballpark as that PCI guesstimate.
 
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