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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: (Michael van Elst)
Subject: Re: kern/53016: Clock not stable 
Date: Sat, 31 Mar 2018 16:28:38 -0000 (UTC) writes:
 >    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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