file transfers & link speed

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Feb 18th, 2010
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Hello,


I was trying to understand a simple scenario regarding bandwidth usage. Assuming there is an ethernet link of 40Mbps capacity between two locations.

there is a huge file transfer of around 400MB from one to another point.

The usage of the link after this transfer is complete shows around 10Mbps, at the same time the end host doing this tranfer has output stating completed transfer with around 1420 kbps.


how do we understand this difference between these seperate interpretations. does 1420 refer to the speed accepted/used by the protocol during the transfer only or is it something else?


Appreciate all help!

Thanks in Advance.

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Giuseppe Larosa Fri, 02/19/2010 - 00:40
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Hello Sunny,

if it is a TCP based file transfer  the delay on the link plays a role too.


see


http://www.psc.edu/networking/projects/tcptune/


http://www.ietf.org/rfc/rfc1323.txt


note also that usually computers systems provide output on byte


something like 1420 KB means = 1420*8 Kbps = 11360 kbps



so this is probably the explanation, different units of measure


Hope to help

Giuseppe

suthomas1 Fri, 02/19/2010 - 01:10
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my apologies, 1420 i was referring to is the converted one. It was around 175 KBps.


Thanks!

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