[time-nuts] NTP jitter with Linux

Mike S mikes at flatsurface.com
Thu Apr 5 03:42:10 UTC 2012


On 4/4/2012 10:41 PM, Steve . wrote:
>breaking the 1pps down as far as 10micro seconds,The
> most obviously problem is that you are trying to use an inaccurate clock
> source(the pc)

Your reply ignores the simple fact that it _does_ track within a couple 
of microseconds, as long as the processor is busy. The PC is _not_ the 
clock source, a PPS signal derived from GPS is. A PC is perfectly 
capable of 10 us accuracy. Even slower processors are capable of 
significantly better accuracy - http://www.febo.com/pages/soekris/ .

> Trying to tweak a PC to get 10microseconds (nyquist, 5microseconds max)

???

Maybe your PC runs in MHz, but mine runs in GHz. Are you confusing us 
with ns?




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