[Bug 211897] horrible time skew under 10.3-R-p7

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Tue Aug 16 11:46:50 UTC 2016


https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211897

--- Comment #1 from Martin S. Weber <freebsd-bugzilla at ayaken.net> ---
This is probably the culprit: from my -p7 dmesg:

Aug 16 09:28:15 hephaistos kernel: Timecounter "TSC-low" frequency 1109872466
Hz quality 1000


vs. 

Timecounter "TSC-low" frequency 2000036900 Hz quality 1000

on -p4

Here's a grep -i time /var/run/dmesg.boot (i.e., -p4):

Event timer "LAPIC" quality 600
hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0
Timecounter "HPET" frequency 14318180 Hz quality 950
Event timer "HPET" frequency 14318180 Hz quality 550
atrtc0: <AT realtime clock> port 0x70-0x77 irq 8 on acpi0
Event timer "RTC" frequency 32768 Hz quality 0
attimer0: <AT timer> port 0x40-0x43,0x50-0x53 irq 0 on acpi0
Timecounter "i8254" frequency 1193182 Hz quality 0
Event timer "i8254" frequency 1193182 Hz quality 100
Timecounter "ACPI-fast" frequency 3579545 Hz quality 900
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x1808-0x180b on acpi0
Timecounters tick every 1.000 msec
Timecounter "TSC-low" frequency 2000036900 Hz quality 1000


Here's the same for the -p7: 
Aug 16 09:28:15 hephaistos kernel: Event timer "LAPIC" quality 600
Aug 16 09:28:15 hephaistos kernel: hpet0: <High Precision Event Timer> iomem
0xfed00000-0xfed003ff on acpi0
Aug 16 09:28:15 hephaistos kernel: Timecounter "HPET" frequency 14318180 Hz
quality 950
Aug 16 09:28:15 hephaistos kernel: Event timer "HPET" frequency 14318180 Hz
quality 550
Aug 16 09:28:15 hephaistos kernel: atrtc0: <AT realtime clock> port 0x70-0x77
irq 8 on acpi0
Aug 16 09:28:15 hephaistos kernel: Event timer "RTC" frequency 32768 Hz quality
0
Aug 16 09:28:15 hephaistos kernel: attimer0: <AT timer> port
0x40-0x43,0x50-0x53 irq 0 on acpi0
Aug 16 09:28:15 hephaistos kernel: Timecounter "i8254" frequency 1193182 Hz
quality 0
Aug 16 09:28:15 hephaistos kernel: Event timer "i8254" frequency 1193182 Hz
quality 100
Aug 16 09:28:15 hephaistos kernel: Timecounter "ACPI-fast" frequency 3579545 Hz
quality 900
Aug 16 09:28:15 hephaistos kernel: acpi_timer0: <24-bit timer at 3.579545MHz>
port 0x1808-0x180b on acpi0
Aug 16 09:28:15 hephaistos kernel: Timecounters tick every 1.000 msec
Aug 16 09:28:15 hephaistos kernel: Timecounter "TSC-low" frequency 1109872466
Hz quality 1000

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