[OLUG] Collisions?

[Super-User]

brian at cbiowa.com says:

> 	The reason I even had the question is because I wanted to test out the
> speed of my network.  I used an extremely big file and ftp.  I expected
> somewhere around 10M/s and I got 6M/s.  This was what looked like an
> obvious place to start looking .


>              Brian Weber
>          Computer Consultant
>              Cap Gemini
>       brian at mail.cbiowa.com

Why did you expect 10M/s?  Did you expect 10 Mbps (megabits per sec.)
or 10 MBps (megabytes per sec.)?

Are you running 100 Mbps ethernet cards or 10 Mbps?  If 100, do you
have a fast hub?

If you are running 10 Mbps ethernet cards (or even one 10 Mbps card) on
the machines you are exchanging data between, then you should not
expect a 10 Mbps transfer rate.  For 10 Mbps ethernet cards, 10 Mbps is
a signaling rate, not the rate you would expect data to be transfered
between two computers running FTP (say) over TCP/IP.  The 10 Mbps
signaling rate serves as a theoretical upper bound; you'll never see
that rate of actual data transfer in the situation I'm describing.  A
data transfer rate of 6 Mbps doing FTP sounds about right to me.

Tell us more about your net, Brian: machine speed, type and speed of NICs,
type and speed of hub, OS of test machines (hope I didn't miss all this
before).

-- 
Dave Burchell                                          40.49'N, 96.41'W
Free your mind and your software will follow.              402-467-1619
http://incolor.inetnebr.com/burchell/                  burchell at acm.org     

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