[p2p-hackers] Silly question about UDP

Alen Peacock alenlpeacock at gmail.com
Sun Jan 28 23:28:53 EST 2007


On 1/28/07, Alen Peacock <alenlpeacock at gmail.com> wrote:
>
> Yes, *especially* if there is *any* hardware at all between the
> systems that are communicating.

Actually, I need to amend that statement.  Intervening hardware
exagerates the effect, but the effect is present regardless.  You can
confirm this by connecting two computers via a crossover cat5 cable
and sending datagrams as fast as you can from one to the other,
measuring how many are received on the other end (use iperf, netperf,
or your favority measurement tool).  For large datagrams, you should
be able to achieve a reasonable throughput.  When you decrease the
datagram size, you'll note a very dramatic drop-off in how much data
you can actually push, sometimes dropping as low as 1/20th of channel
capacity (depending on hardware).

Alen


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