[ntp:questions] is USB inherently evil, or only if something else is on the bus?
rick.jones2 at hp.com
Thu Aug 9 16:55:01 UTC 2012
David Taylor <david-taylor at blueyonder.co.uk.invalid> wrote:
> Rick, judge for yourself. I made a simple comparison between pure LAN
> sync, and PPS over USB sync here:
> The minimum average jitter value was 110 - 140 µs with the LAN
> connection, and 45 µs with the USB/PPS connection. So a USB/PPS
> connection may be better than a LAN connection, and most likely much
> better than a WAN or Wi-Fi connection. Direct serial/PPS is much
> better than USB, though.
WRT LAN, I'll refer back to previous discussions about interrupt
coalescing/avoidance algorithms for LAN cards. I think unruh did some
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There's only yourself. The belief is in your own precision. - Joubert
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