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

[SAITOH Masanobu <msaitoh%execsw.org@localhost>]

The following reply was made to PR kern/55247; it has been noted by GNATS.

From: SAITOH Masanobu <msaitoh%execsw.org@localhost>
To: gnats-bugs%netbsd.org@localhost, kern-bug-people%netbsd.org@localhost,
 gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
Cc: msaitoh%execsw.org@localhost
Subject: Re: kern/55247: Recent tsc changes make clock race (1 hour per day)
Date: Tue, 12 May 2020 15:45:01 +0900

 On 2020/05/09 4:15, christos%astron.com@localhost 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
 >> Organization:
 > 	Racing Clocks Inc.
 >> Environment:
 > System: NetBSD quasar.astron.com 9.99.60 NetBSD 9.99.60 (QUASAR) #165: Tue May 5 20:44:19 EDT 2020 christos%quasar.astron.com@localhost:/usr/src/sys/arch/amd64/compile/QUASAR amd64
 > Architecture: x86_64
 > Machine: amd64
 >> Description:
 > 
 > 	Ntp refuses to sync since the clock is racing too fast.
 > 
 >> How-To-Repeat:
 >          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)
 > 
 >> Fix:
 > 	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 (msaitoh%execsw.org@localhost
                                   msaitoh%netbsd.org@localhost)