[ntp:questions] Re: isolated network + accuracy
Richard B. Gilbert
rgilbert88 at comcast.net
Tue Dec 14 02:12:03 UTC 2004
Bjorn Gabrielsson wrote:
>"Richard B. Gilbert" <rgilbert88 at comcast.net> writes:
>
>
>
>>Using an internet server as a time source will almost certainly not
>>allow you to achieve 1ms accuracy! 10ms accuracy is possible over the
>>internet but cannot be guaranteed.
>>
>>
>
>I get sub 1ms time from internet servers.
>
>
The internet servers I use tend to wander within plus/minus 5-10ms of my
GPS receiver!! I'm using the best servers I can find and I've seen far
worse than the ones I finnally settled on. Their clocks my be far
better than what I'm seeing but by the time the packets get here the
quality looks really poor. Your milage may vary.
>
>
>>1ms accuracy is a very high standard and quite difficult to meet. I
>>don't believe that Windows is capable of it. Linux may not be
>>either. Some flavors of Unix are capable, at least in principle. I
>>believe that Solaris is. I lack sufficient recent experience with
>>other flavors of Unix to offer an informed opinion.
>>
>>
>
>My Linux computers shows no problem reaching below 1ms.
>
>
My RedHat Enterprise Linux 3.0 workstation rarely runs an offset less
than 5ms. Once again your milage may vary!!
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