High CPU usage on the server (dom0)
System (bare metal, domUs are kinda OK) is slow, etc: top shows ~100% of kworker on the dom0.
#1 Updated by Philippe May over 3 years ago
perf top: acpi issue?
Seen in https://bbs.archlinux.org/viewtopic.php?id=223799, run:
grep . -r /sys/firmware/acpi/interrupts
/sys/firmware/acpi/interrupts/gpe6F has a very high number (of interrupts).
echo "disable" >/sys/firmware/acpi/interrupts/gpe6F
Great, the damn ACPI doesn't flood the CPU with interrupts and load back to normal.
What is gpe6F? Bug in the BIOS firmware (it's a Dell PowerEdge T30/07T4MC, BIOS 1.0.12 12/06/2017)? No idea, but there's an update: https://www.dell.com/support/home/us/en/04/product-support/product/poweredge-t30/drivers (1.0.15).
- Try firmware update and check if the problem reappears
- If yes, make the hack resilient over reboots