CPU Speed

[mechanic]

I set the CPU speed to A1 (800M) but Ranger still reports 1800MHz. It is running slower.

Is there another way to see CPU speed in AmigaOS?

[sundown]

I set the CPU speed to A1 (800M) but Ranger still reports 1800MHz. It is running slower.

Is there another way to see CPU speed in AmigaOS?

In CFE, type show pmu, that will show the current clock speed. You can't change it in os4, it defaults to 1.8GHz when fully booted. You can set a variable with the -p option to set the clock speed different for WB. I'll have to check Ranger before & after a clock change to see if it's working right.

Ken

[mechanic]

I'll have to check Ranger before & after a clock change to see if it's working right.

Ken

Hi Ken

I set both the pmu and the speed options in CFE thus

setenv -p STARTUP "set pmu -astate=A2 ; menu"
setenv -p speed A2

Linux /proc/cpuinfo shows 800MHz. Amiga ranger=1800MHz.

So if AOS is indeed running at 1800, what is changing it?
KSmodule?

Len

[sundown]

I just tried to change the os4 speed to 500MHz, but all that does is boot at 500MHz & changes to 1.8GHz after. There is no os4 file that changes it, think its a CFE h/w thing. If you're running linux squeeze, there was a setting to set the cpu speed higher & I believe the last linux kernel forced the speed to 1.8GHz to eliminate the need to manually change it, kernel-39D.

setenv -p speed A2 won't work, you have to set it like setenv -p speed "set pmu -astate=a2". If you change the speed setting, does the linux speed change?

Ken

[mechanic]

Yes.
What ever I set CFE to, using both commands (which may not be necessary) is what Linux reports in /proc/cpuinfo.

I have tried 500, 800, and 1200MHz settings. I am using 39D kernel.

I notice AOS loads slower and seems to do large cpu memory transfers slower with lower settings but can not be sure as I haven't really timed the different configs.

Perhaps, lacking more knowledge, I'll do some loop test with different clock settings.

[ssolie]

You cannot change CPU speed in AmigaOS. It is hard coded to go max speed.

[sundown]

Yes.
What ever I set CFE to, using both commands (which may not be necessary) is what Linux reports in /proc/cpuinfo.

Interesting, don't think anyone has tried that test yet.

I have tried 500, 800, and 1200MHz settings. I am using 39D kernel.

I notice AOS loads slower and seems to do large cpu memory transfers slower with lower settings but can not be sure as I haven't really timed the different configs.

Booting will be slower with lower clock speed, the whole bootup procedure will only be running at the speed you set in CFE. First beta systems were booting at 500MHz, didn't take long for someone to figure out how to change it to 1.8GHz for a faster boot.

Perhaps, lacking more knowledge, I'll do some loop test with different clock settings.

As ssolie said, the system runs at 1.8GHz when os4 is running, the clock speed change only affects the CFE speed & linux, if your right.

Any reason why you want a slower speed or are you just experimenting?

Ken

[mechanic]

Thanks Ssolie, and sundown the answer is yes. Just digging around getting to know what I have here.