Leopard underclocking cpu?

[martijndeluxe]

Yep, ive seen that to. The CPU scales up just fine when botch cores utilized.

The only thing i say now is that with Reaktor and also Reason this doesnt happen.

 

[martijndeluxe]

Anywayz,

What i'm now most intrested in is how Ableton Live performs on Leopard vs XP.

-M-

 

[martijndeluxe]

o oow...

http://forum.ableton.com//viewtopic.php?t=79733&postdays=0&postorder=asc&start=0

 

[neonblue2]

Well have you tried disabling one core and seeing what that does yet? There's certainly nothing wrong with the Santa Rosa processors because my sister's computer much faster than mine and benchmarks back up the speed increase.

 

[martijndeluxe]

Well have you tried disabling one core and seeing what that does yet? There's certainly nothing wrong with the Santa Rosa processors because my sister's computer much faster than mine and benchmarks back up the speed increase.

Took me a bit of time to figger out how to do that ;-) It didnt seem to make a diffrence though. Reaktor was no longer jumping from core to core but the CPU load was the same...'

-M-

 

[ppc750fx]

Took me a bit of time to figger out how to do that ;-) It didnt seem to make a diffrence though. Reaktor was no longer jumping from core to core but the CPU load was the same...'

Which pretty much blows the "bug in Leopard's CPU frequency scaling" theory out of the water.

As I said: it's a bug with Reaktor, not with Mac OS X.

 

[martijndeluxe]

Which pretty much blows the "bug in Leopard's CPU frequency scaling" theory out of the water.

As I said: it's a bug with Reaktor, not with Mac OS X.

It still uses 2 times more CPU than on my Dell when i switch off a core... So its still not speeding up. Besides if ableton also has this problem, than the mac may be a way cooler better machine but not for me.

CHeerZ

 

[ppc750fx]

It still uses 2 times more CPU than on my Dell when i switch off a core... So its still not speeding up.

Did you try taking a look at the running frequency? I'm willing to bet that your CPU is scaling up its frequency just fine. An individual tool (or tools) might have issues running multi-threaded code with acceptable performance, but I'm pretty confident that it's not a Leopard bug preventing CPU frequency scaling from functioning correctly.

 

[martijndeluxe]

Did you try taking a look at the running frequency? I'm willing to bet that your CPU is scaling up its frequency just fine.

Noop CoolBook's meter shows it does scale up to max about 25% of the time...

The good news however: i downoaded the Ableton Live Trial, and in this host the CPU scales up just fine and i can run for example 4 reaktor instances and have quite simular results as on my windows box.

So thats good news right. So here only Reaktor and Reason (big single threaded apps) seemed to have this problem.

Phieuw ;-)

-M-

 

[ppc750fx]

So here only Reaktor and Reason (big single threaded apps) seemed to have this problem.

So the conclusion, after all this, was that Leopard isn't underclocking the CPU, nor does it have a bug preventing the correct operation of SpeedStep.

Glad we got that resolved.

 

[martijndeluxe]

So the conclusion, after all this, was that Leopard isn't underclocking the CPU, nor does it have a bug preventing the correct operation of SpeedStep.

Glad we got that resolved.

Ya i'm happy about that to ;-)

I have to say the MacBook is getting extreemly hot though...

Ableton on the MacBook 2.4GHz has now the exact same performance as on my Dell2GHz. But i wont complain about that. This is good enought to rock and roll...

Cheerz,

-M

 

[martijndeluxe]

Snowleopard resolved the issue

A little update on the issue.

Sinds i installed Snow Leopard the whole underclocking issue got magicly resolved ;-)

The mac is now finaly as fast as Windows XP on a Dell, The CPU steps up as required using the same software versions as the previous testing...

So it was a Leopard issue that now has been resolved thanx to Snow Leopard Woohoo!!!

Cheerz,

-M-