CVSROOT: /cvs
Module name: src
Changes by: chel...@cvs.openbsd.org 2023/03/08 11:05:05
Modified files:
sys/arch/amd64/amd64: lapic.c
Log message:
amd64: lapic_timer_rearm: don't reset mode, mask, divisor
The apic timer mode, mask, and divisor are set during lapic_timer_trigger().
We don't need to reset them when rearming the timer. On physical hardware
the difference is too small to measure, but skipping two apic writes may be
a bit faster when we're running in a VM.
Bochs also likes to log when the apic divisor is changed:
38569516308i[APIC0 ] set timer divide factor to 1
38569517335i[APIC0 ] set timer divide factor to 1
38569518042i[APIC0 ] set timer divide factor to 1
[...]
With this change, Bochs is a lot less noisy.
Idea from mlarkin@.
ok mlarkin@
