[ntp:questions] Re: Time sync with milliseconds with Windows XP
Al Dykes
adykes at panix.com
Tue Sep 6 14:25:06 UTC 2005
In article <p06200779bf434442c598@[10.0.1.210]>,
Brad Knowles <brad at stop.mail-abuse.org> wrote:
>At 5:52 AM -0700 2005-09-06, Magnus wrote:
>
>> We have some servers that are sending data to each other 10 times per
>> second. They need to be time synced and my question is if the NTP
>> client in Windows are sufficient exact for the application.
>>
>> If no, how can I get time sync with milliseconds in Windows XP?
>
> To the single millisecond level? You can't. Beyond typical
>hardware configuration problems, the OS itself loses too many
>interrupts on a busy machine. If the machine is doing absolutely
>nothing else, and you've configured the hardware correctly, you might
>get it into the single millisecond range, but that kind of defeats
>your purpose.
>
> If the machine is doing anything at all, even with the hardware
>configured correctly, the best you can hope for is to get accuracy in
>the 10-100ms range, most likely closer to the middle or top end of
>that range.
>
> And that's with "real" NTP on the machine. Running w32time or
>whatever crap Microsoft ships, you're not going to get anywhere close
>to that.
>
What about getting a WWV receiver that generates a PPS serial signal
and usuing a Y cable to connect it to both machines running real ntp.
This depends, of course, on being in a location where you can get a
WWV (or GPS) signal and have some money to spend on a receiver.
--
a d y k e s @ p a n i x . c o m
Don't blame me. I voted for Gore.
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