Re: NetBSD on Intel N100

[Jukka Marin <jukka.marin%jmp.fi@localhost>]

On Sat, Aug 08, 2026 at 01:51:02PM +0300, Andrius V wrote:
> On Sat, Aug 8, 2026 at 1:10???PM RVP <rvp%sdf.org@localhost> wrote:
> > Did you also check (on OpenBSD):
> >
> > sysctl hw.sensors | fgrep freq

Unfortunately not.

> Otherwise CPU should in theory control frequency itself if enabled...
> The question is if BIOS provides this option to enable it (Intel Speed
> Shift or some P states, I am not sure?) and what are default values
> for the system...

There's the Speed Shift option and it's enabled (by default).  I think
the CPU clock is shown as 800 MHz in BIOS, so that's probably why it's
also 800 MHz under NetBSD,

> On short research, it is basically some MSRs which controls the "mode"
> on Intel CPUs, and Linux/FreeBSD seemingly has some code to check MSR
> features and enables those bits.
> 
> NetBSD doesn't do that, so I guess it depends on defaults... I think
> with right skills or using AI you can write C program to show 0x770
> MSR value (maybe even write one to set required MSRs, but just
> speculation now).

Is the N100 (and it's close relatives) the only CPUs needing this - do
the mainstream CPUs use a different system which has been implemented
on NetBSD already?  I don't think everybody's running their computers
at the lowest clock possible.. :)

  -jm