just noticed with a -current from yesterday (today's -current has the
same problem).

After bootup I will see tons of
calcru: negative time of -953757 usec for pid 636 (make)
calcru: negative time of -820616 usec for pid 636 (make)
microuptime() went backwards (1969.4485199 -> 1969.552693)
microuptime() went backwards (1969.4485199 -> 1969.690311)
messages, together with processes with a negative CPU usage time.

Something is going wrong during setting clock interrupts.
A "vmstat -i" shows (among other interrupts):
clk irq0                    79496         49
rtc irq8                   101753         63
which is about half the rate it should be.

The latest working kernel I was booting before was from Jul, 13th

If I disable ACPI in the kernel the interrupt rate is back to normal.

ACPI related boot messages:
acpi0: <GBT    AWRDACPI> on motherboard
acpi0: power button is handled as a fixed feature programming model.
acpi_timer0: <32-bit timer at 3.579545MHz> port 0x4008-0x400b on acpi0
acpi_cpu0: <CPU> on acpi0
acpi_button0: <Power Button> on acpi0
acpi_pcib0: <Host-PCI bridge> on acpi0
pci0: <PCI bus> on acpi_pcib0
acpi_cpu0: set speed to 100.0%
acpi_cpu: CPU throttling enabled, 2 steps from 100% to 50.0%

Mainboard is a GigaByte GA-5AX with F3 BIOS.

I will provide further configuration information if needed.


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