On 2024-04-24, Harald Dunkel <harald.dun...@aixigo.com> wrote:
> Hi folks,
>
> https://www.openbsd.org/faq/upgrade57.html doesn't mention it, so
> I wonder what became of "apmd -C"? The man page for OpenBSD 5.7
> silently dropped this option, but even apmd of 7.5 still accepts
> it.
>
> ?
apmd used to have code that checked cpu load and adjusted hw.setperf.
This moved to the kernel under hw.perfpolicy=auto which used to do
about the same thing, but was changed to use high all the time on
a machine where line power is connected.
To get similar to previous behaviour, you can either install obsdfreqd
from packages (userland monitoring, similar to old old apmd -C), or
some people run with a kernel patch like this:
Index: kern/sched_bsd.c
===================================================================
RCS file: /cvs/src/sys/kern/sched_bsd.c,v
diff -u -p -r1.91 sched_bsd.c
--- kern/sched_bsd.c 30 Mar 2024 13:33:20 -0000 1.91
+++ kern/sched_bsd.c 24 Apr 2024 07:18:01 -0000
@@ -603,7 +603,7 @@ setperf_auto(void *v)
if (cpu_setperf == NULL)
return;
- if (hw_power) {
+ if (0 && hw_power) {
speedup = 1;
goto faster;
}
