FreeBSD & SpeedStep

[e***@seznam.cz]

Hi!
This is my first mail to the list and I want to sorry for my english
(I'm spanish ;D)
My question is... Is speedstep supported by FreeBSD? My notebook is a p4
mobile (1,7 Ghz)
I'm using cpydyn or cpufreq under linux... and it works fine. It speed
up or down my cpu frequency if needed.
I've read something in 5.2.1 with acpi... but I don't know if it's like
linux. Any idea?
Thanks a lot ;)

[d***@poupinou.org]

Post by e***@seznam.cz
Hi!
This is my first mail to the list and I want to sorry for my english
(I'm spanish ;D)
My question is... Is speedstep supported by FreeBSD? My notebook is a p4
mobile (1,7 Ghz)

Not yet.

[f***@altpeter.de]

Hello!

Post by d***@poupinou.org

Post by e***@seznam.cz
Hi!
This is my first mail to the list and I want to sorry for my english
(I'm spanish ;D)
My question is... Is speedstep supported by FreeBSD? My notebook is a p4
mobile (1,7 Ghz)

Not yet.

This answer only applies AFAIK to 4.x FreeBSD versions. 5.2-CURRENT
does indeed support speedstep technology.

# dmesg | grep step
acpi_cpu: throttling enabled, 8 steps (100% to 12.5%), currently 100.0%


With kind regards,

Frank Altpeter

[o***@es.net]

Date: Fri, 11 Jun 2004 11:07:49 +0200

Post by f***@altpeter.de
Hello!

Post by d***@poupinou.org

Post by e***@seznam.cz
Hi!
This is my first mail to the list and I want to sorry for my english
(I'm spanish ;D)
My question is... Is speedstep supported by FreeBSD? My notebook is a p4
mobile (1,7 Ghz)

Not yet.

This answer only applies AFAIK to 4.x FreeBSD versions. 5.2-CURRENT
does indeed support speedstep technology.

No.

Post by f***@altpeter.de
# dmesg | grep step
acpi_cpu: throttling enabled, 8 steps (100% to 12.5%), currently 100.0%

The processor will be throttled, so frequency will change somehow. But
the voltage (which is the key to speedstep technology) will be the same.

Actually, it's not really even that. The clock runs at the same speed,
but the duty cycle is reduced to accomplish the "throttling". That allows
it to work with little hardware requirements, but means that, if you are
testing CPU speed, it will not change.

SpeedStep is actually far more sophisticated. It is not in either V4 or
V5 at this time, but should be coming to V5 fairly soon. Depends on the
time the small number of developers who understand the newbus and ACPI
stuff has available.
Much of the ACPI project is waiting for architectural changes to be
completed. For instance, the cpufreq driver requires newbus
attachments for CPUs. Support code for this should be committed at the
time of publication.