Discussion:
PC time error interesting cause
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Tim Tuck
2018-06-23 21:31:08 UTC
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Hi all,

I have a PC that I use for ham stuff etc. and as part of the normal
build I added NTP keep it on track for the things such as WSPR, JT65 etc.

I also installed the Meinberg Time Monitor to keep an eye on things.
What I found was that over a day of operation, the time would slip
nearly two seconds and sometimes randomly jump forward two seconds or so.

I didn't think there was anything wrong with the PC since it was a fresh
install of Windows 7 with minimal applications installed.

What I eventually found was that the "Power Options" item default of
"balanced" was the cause for this PC's time slips. Changing the setting
to "High Performance" stopped the time walking around.

Interestingly I have another PC set to "Balanced" that does not exhibit
this problem.

Has anyone else seen this effect ?

regards

Tim

de VK2XAX


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Poul-Henning Kamp
2018-06-23 21:48:42 UTC
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--------
Post by Tim Tuck
Has anyone else seen this effect ?
You have unwittingly waded into one of Intels quagmires: What
rate does TSC run, and when.

He aware that your PC will likely use a fair bit more power
on the high performance setting.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
***@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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