[time-nuts] Timing performance of servers

Rob Kimberley robkimberley at btinternet.com
Thu Oct 25 04:20:56 EDT 2012


You can get NTP for windows and also their NTP Monitor. 

Free download.

Rob Kimberley

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Edgardo Molina
Sent: 25 October 2012 01:05
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Timing performance of servers

Dear Mangus,

I will allow myself to share a comment on your thread. 

Timing on windows servers is not one of their plausible strengths. It was
clearly pointed out during the SIM conference last week at CENAM. In fact
there was an interesting discussion about the drawbacks when using NTP
Windows based servers and all kind of NTP appliances compared to full size
Linux based NTP servers. The example of what NIST is using nationwide for
their servers set an example of good server hardware and linux to provide
the nation's NTP pulse.

I haven't done any experiments with Windows for NTP services, still it could
be interesting as to set a benchmark while comparing it to the Linux boxes.

I am currently trying out the Domain Time II NTP client from Symmetricom for
the thesis. I have to come back to Symmetricom's Miguel García to decide on
purchasing a Domain Time II NTP client kit.  How is the Mainberg NTP client
different from the Symmetricom version? Have you tried both? If not I will
be more than glad to help comparing both if you can help me pointing out the
source for a demo version of Mainberg's software. Maybe then an objective
review of both clients will be in order, I will be more than glad to do it
or to test them against Windows NTP services, appliances and/or Linux NTP
boxes. I have at least an example of those at the office.

Just my  2x10	cents.

Regards to you and the group,

Edgardo Molina
Dirección IPTEL


T : 55 55 55202444
M : 04455 20501854

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On Oct 24, 2012, at 5:47 PM, Magnus Danielson <magnus at rubidium.dyndns.org>

> Fellow time-nuts,
> When spending time on a conference last week, I heard one interesting
comment that they lost data due to bad timing on their Windows servers.
> Now, I know that the standard Windows uses SNTP in order to achieve the
goal of having the timing of the machines sufficiently aligned to allow
Kerberos authentication. SNTP suffice for that, as it needs to be a handful
of minutes in line.
> If you need better performance than that, you should use NTP (and then
download and install Meinbergs Windows-client for NTP).
> Then again, I would point out that for this type of data, it would most
probably be better served on a Linux box.
> What should be a nice wake-up call for them would be a summation of how
different strategies would give them clock precision of sufficient grade.
So, does anyone know of such measurements presented anywhere?
> There are bits and pieces, but the ideal for this case would be if they
where collected in one page/paper.
> This is an awareness thing, so that people can do a little more
well-informed choices.
> Cheers,
> Magnus
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