From: John Beckett 

"Rich"  wrote in message news::
>    I tried one of my own tools.  With a UDP payload size of 1K I can get
> 50% network utilization of a 1GB adapter with 100% CPU utilization.  If
> I increase the payload size to 1025 bytes then I get 4% network
> utilization with around 35% CPU utilization.

Yesterday I wasn't thinking. Now I am really impressed. You would have to
send one 1KB packet every 16 microseconds to take a 1Gbps network to 50%
utilisation. No wonder the CPU was at 100%.

The weird results for 1025 bytes are still a mystery, but somehow more
understandable when you think about the incredible optimisations that must
be going on to allow a usermode app to queue, and the OS to deliver,
packets at that rate.

John

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