Recommended PCI gigabit ethernet card? OT: PC Gigabit Through putQuestion
Flaherty, Patrick
pflaherty at wsi.com
Thu Jun 14 17:01:14 EDT 2007
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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