On Fri, Jun 10, 2022 at 11:52 AM <blinkin@xxxxxxxx> wrote: > > hello, any news on this? > > ----- Messaggio originale ----- > Da: "Thomas Gleixner" <tglx@xxxxxxxxxxxxx> > A: blinkin@xxxxxxxx > Cc: "linux-kernel" <linux-kernel@xxxxxxxxxxxxxxx>, "Rafael J. Wysocki" <rafael@xxxxxxxxxx>, "Len Brown" <lenb@xxxxxxxxxx>, linux-acpi@xxxxxxxxxxxxxxx > Inviato: Mercoledì, 11 agosto 2021 16:20:41 > Oggetto: Re: Bug report for kernel v4.15-rc8+ > > On Wed, Aug 11 2021 at 15:51, blinkin@xxxxxxxx wrote: > > 1) You're booting with an out of tree module > > > > Uninstalled virtualbox, reproduced same behavior without the module. > > dmesg outputs attached with and without the workaround > > (dmesg_novboxdrv_clean.txt and dmesg_novboxdrv_irqaffinity0.txt) > > Ok. > > > 2) Please provide information what is consuming 90% of a CPU > > > > top shows a kworker process consistently at 50% without the > > workaround, 60% with the workaround. No significant activity amounts > > from other processes. Sometimes that 50% is split between two > > kworker processes for a short time. CPU core #0 activity is a > > constant 60% without the workaround, 90% with the workaround > > That's broken. /proc/interrupts gives some hint: > > 1) Stock kernel > > > CPU0 CPU1 CPU2 CPU3 > > 0: 10 0 0 0 IR-IO-APIC 2-edge timer > > 1: 0 0 0 9 IR-IO-APIC 1-edge i8042 > > 8: 0 1 0 0 IR-IO-APIC 8-edge rtc0 > > 9: 0 923411 0 0 IR-IO-APIC 9-fasteoi acpi > > 900k ACPI interrupts right after boot > > > CPU0 CPU1 CPU2 CPU3 > > 0: 10 0 0 0 IR-IO-APIC 2-edge timer > > 1: 0 0 0 11 IR-IO-APIC 1-edge i8042 > > 8: 0 1 0 0 IR-IO-APIC 8-edge rtc0 > > 9: 0 4869059 0 0 IR-IO-APIC 9-fasteoi acpi > > One minute later it's 4.8M > > With affinity forced to CPU0 it's even more: > > > CPU0 CPU1 CPU2 CPU3 > > 0: 10 0 0 0 IR-IO-APIC 2-edge timer > > 1: 9 0 0 0 IR-IO-APIC 1-edge i8042 > > 8: 1 0 0 0 IR-IO-APIC 8-edge rtc0 > > 9: 7576456 0 0 0 IR-IO-APIC 9-fasteoi acpi > > 7.5M right after boot > > > CPU0 CPU1 CPU2 CPU3 > > 0: 10 0 0 0 IR-IO-APIC 2-edge timer > > 1: 11 0 0 0 IR-IO-APIC 1-edge i8042 > > 8: 1 0 0 0 IR-IO-APIC 8-edge rtc0 > > 9: 10992420 0 0 0 IR-IO-APIC 9-fasteoi acpi > > 10.9M after one minute. Though the delta between right after boot and 1 > minute later is in the same ballpark. > > Cc'ed the ACPI people for clues. Looks like a GPE storm to me. I would look into /sys/firmware/acpi/interrupts/* for hints.
