https://bugzilla.kernel.org/show_bug.cgi?id=218511
Bug ID: 218511
Summary: High system load when acessing EC
Product: ACPI
Version: 2.5
Hardware: Intel
OS: Linux
Status: NEW
Severity: high
Priority: P3
Component: EC
Assignee: acpi...@kernel-bugs.osdl.org
Reporter: dmummensch...@web.de
Regression: No
Hello,
since 6.8-rc1 I'm experiencing an unusual high system load when acessing the EC
through ACPI. I need to do this several times a second. My system constantly
shows 30-50% system load on irq/9-acpi during that time. With previous kernel
versions I never saw that even with higher access intervals. I've nailed down
the offending commit to:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/acpi/ec.c?id=eb9299beadbdd7be8de1e97f1059e89bcb64b05d
It seems that leaving interrupts on during acces causes the system monitor to
show the access times as system load.
An easy way to reproduce this just execute "od -Ax -t x1
/sys/kernel/debug/ec/ec0/io" three or more times a second and watch the system
load go up during EC access. The respone time also increased subjectively but I
didn't find the time to do some meassurements on that.
This is really confusing. Is this how it's supposed to be from now on?
Kind Regards,
Dieter
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