From: "Gregg N" 

Robert Comer wrote:
> I thought maybe that was the case, but I got lots worse numbers using
> a smaller -b on my 100Mbit ether, especially with larger packets.  the
> difference between larger packs and smaller ones wasn't near as big
> with -b set to 100M or higher.
>
> fragmentation and collisions from the extra traffic is probably what's
> making the difference, but I'm not losing near the performance you
> are... (90Mbit for 1024 vs 80Mbit for 1025)...
>

There shouldn't be fragmentation with a 1500-byte MTU. To eliminate the
effect of collisions, you can use the loopback interface and see similar
results. I got:

-b 1000m -l 1024 ==> 250 Mbps
-b 1000m -l 1025 ==> 200 Mbps

It seems to be something in the protocol and/or sockets implementation.

Gregg

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