Re: Melting the Internet?

Andrew Lih (lih@cs.columbia.edu)
Thu, 04 May 1995 13:50:44 -0400


In message <9505041724.AA08022@frisky.Franz.COM>, Sean Foderaro writes:
>
> Let me describe an experiment I just finished.
>
>
> Machine A ------------- Machine B ------------ Machine C
> 10mbps 115kbps
> (V.34 modem w/V.42bis compression)
>
> Machine A sends 10,000 128 byte packets to Machine C using TCP
> and then UDP. We measure how long the sending takes on Machine A
> and the receiving takes on Machine C. For the UDP case we measure
> packet loss. Machine A tries to send as fast as possible but
> we don't use non-blocking I/O so the operating system will block
> the writing process if it has to. All times are wall-clock times.
>
> TCP case:
> Machine A: 113 seconds to send
> Machine C: 113 seconds to receive
>
>
> UDP case:
> Machine A: 8 seconds to send
> Machine B: 125 seconds to receive.

!!! ^ should this be "Machine C"?

> The last 6 packets were dropped.

What type of software was on Machine B? Was this SLIP/PPP doing
routing?

-Andrew

`''' Andrew "Fuz" Lih Columbia University
c @@ lih@cs.columbia.edu Mobile Computing Laboratory
\
- (PCMCIA: People Can't Memorize Computer Industry Acronyms)