Testing ntpd and/or timing from gpsd

[Hal Murray]

gem at rellim.com said:
> Easy to use, but in practice I have not found the RasPi ethernet to perform
> any worse than a GigE port on a motherboard. 

Most of the GigE chips have the option to batch interrupts.  That's good for 
throughput since it reduces the CPU load due to interrupts but bad for things 
like NTP since it adds latency and probably jitter.

I don't have any numbers handy.  It would be interesting to run a few 
experiments.

Does anybody have the recipe handy for disabling that?


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