[ntp:questions] best gps receiver for time synchronization

Richard B. Gilbert rgilbert88 at comcast.net
Wed Mar 11 15:39:55 UTC 2009


David J Taylor wrote:
> Richard B. Gilbert wrote:
>> David J Taylor wrote:
>>> David Woolley wrote:
>>> []
>>>> You won't get millisecond accuracy on Windows.  Although the
>>>> software clock can be disciplined to better than a millisecond,
>>>> applications can only read to one tick, which is 10ms by default
>>>> and 1ms with the fastest multi-media timers (which risks lost
>>>> ticks).
>>>
>>> David, do you have a reference for your "risks lost ticks" statement
>>> as applied to Windows?
>>>
>>> Thanks,
>>> David
>>
>> ISTR that there have been previous references in this newsgroup.
>> Specifically, EIDE disk drivers can mask or disable interrupts  for a
>> period long enough  to cause a "lost tick".  I believe the group is
>> archived somewhere. . . .
> 
> Thanks, Richard.  I can imagine that any disks working in PIO mode 
> wouldn't be welcome friends either.  The last EIDE desktop PC I bought 
> was some seven years ago, so I hope it's a problem which won't affect 
> too many people, and all being well not those starting from scratch.
> 

I don't know if SATA is any better.  I don't run ntp on my PC.




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