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Re: kern/53016: Clock not stable
The following reply was made to PR kern/53016; it has been noted by GNATS.
From: mlelstv%serpens.de@localhost (Michael van Elst)
Subject: Re: kern/53016: Clock not stable
Date: Sat, 31 Mar 2018 16:28:38 -0000 (UTC)
> Timecounter Clock speed Comments
> TSC -0.47ms / minute Stabile change
> clockinterrupt -370ms / minute Jumps 50 ms or so every now and then
> ichlpcib0 +3.05ms / minute Stabile change
> hpet0 +3.12ms / minute Stabile change
> ACPI-FAST +3.05ms / minute Stabile change
> lapic +-1s / minute Seems to be random, goes up and down randomly
> i8254 +2.28ms / minute Stabile change
3ms / minute is a rather usual value for a PC clock. That's an error
of about 50ppm or 4 seconds per day.
If ntpd cannot correct this, I'd guess there is a problem with the NTP
Michael van Elst
"A potential Snark may lurk in every tree."
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