[ntp:questions] ntp-4.2.6p5 on Win 7 x64
me at privacy.net
Thu Jul 24 16:41:25 UTC 2014
On Tue, 22 Jul 2014 19:29:01 +0100, David Taylor wrote:
> Nick, I have seen (some time back) NTP run a little wild when the drift
> file is so near the limit. You aren't overclocking, I suppose? Anyway,
> try deleting the drift file and letting NTP run for more than an hour.
No overclocking on this machine! Deleting the drift file fixes it.
> If there's something which is causing your PC to have an incorrect clock
> in Windows, you /may/ be able to compensate using an environment
> variable as described here:
> Oh, it looks like you've considered that already, but have you tried
> setting NTPD_TICKADJ_PPM?
Yes I tried that and it didn't seem to matter what value was set the
performance got worse. The jitter is so bad.
> I suppose there's no issue with power-saving, or a spread-spectrum BIOS?
Funny you should say that. Although all the PM is turned off in the BIOS
I found a sneaky setting via Control Panel called Power Management,
Minimum Processor State. Changing this from 5% to 100% reduced the DPC
latency dramatically and improved NTP's performance.
Offsets and jitters now in the 10's of ms.
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