FastE NIC Recommendation (latency)

[Michael Stein]

> Unlike the case of a global shared memory, low latency is not always a
> good thing.  Gigabit Ethernet adapters go to some effort to _increase_
> latency so that the CPU can process multiple messages during each
> interrupt.  This interrupt mitigation might even be clever enough to
> look at the destination of the next incoming packet to decide if the
> interrupt should be deferred.

That must be what I'm seeing as I was just using "ping".

What's a good way to measure latency?
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