https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226968
Bug ID: 226968
Summary: IRQ storm on cpu0 timer when holding down key on USB
keyboard
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: usb
Assignee: freebsd-usb@FreeBSD.org
Reporter: johal...@gmail.com
I noticed this when playing a first person shooter with keyboard controls.
To verify, do the following:
Open a terminal window (I used xfce4-terminal)
Run
$ systat -vmstat
On the USB keyboard, hold down some key like 'a'.
All is normal at this stage.
Without releasing 'a', press and release another key, like 'b'.
See the irqs on cpu0:timer go up to several hundred thousand.
Release 'a' and it will go back to normal.
USB debug information (hw.usb.xhci.debug=16) does not show abnormal amounts of
interrupts.
With this bug, playing a fps-like game with keyboard controls is impossible
since the whole game lags during irq storm.
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