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Re: kern/55247: Recent tsc changes make clock race (1 hour per day)

On 2020/05/09 4:15, wrote:
Number:         55247
Category:       kern
Synopsis:       Recent tsc changes make clock race (1 hour per day)
Confidential:   no
Severity:       serious
Priority:       medium
Responsible:    kern-bug-people
State:          open
Class:          sw-bug
Submitter-Id:   net
Arrival-Date:   Fri May 08 19:15:00 +0000 2020
Originator:     Christos Zoulas
Release:        NetBSD 9.99.60
	Racing Clocks Inc.
System: NetBSD 9.99.60 NetBSD 9.99.60 (QUASAR) #165: Tue May 5 20:44:19 EDT 2020 amd64
Architecture: x86_64
Machine: amd64

	Ntp refuses to sync since the clock is racing too fast.

         Manufacturer: Dell Inc.
         Product Name: Precision 5820 Tower
	kern.timecounter.choice = TSC(q=3000, f=3850000000 Hz) clockinterrupt(q=0, f=4000 Hz) hpet0(q=2000, f=24000000 Hz) ACPI-Fast(q=1000, f=3579545 Hz) lapic(q=-100, f=25000000 Hz) i8254(q=100, f=1193182 Hz) dummy(q=-1000000, f=1000000 Hz)

	sysctl -w kern.timecounter.hardware=hpet0

Cold you try x86/cpu.c rev. 1.191?

And also please show the following info:

- full dmesg
- cpuctl -v identify 0

Thanks in advance.

                SAITOH Masanobu (

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