Re: problem with cpu eating too much power, prize given if solved

Pavel Machek
2004-06-30T19:35:03Z

Hi!

> Please refer to http://acpi.sourceforge.net/documentation/sleep.html
> and ACPI spec 2.0a around Page 216
>
> "Sleep States
> S1 - "Stopgrant"
> Power to cpu is maintained, but no instructions are executed.
> The CPU halts itself and may shut down many of its internal
> components. In Microsoft Windows, the "Standby" command
> is associated with this state by default.
> "
>
> If you look at the original post, S1 "Stopgrant" costs 5W on his celeron.
> It takes a lot
> more on many 90nm chips. I read in the Centrino datasheet that it can draw
> 15W
> stopgrant at _maximum_ vcore!!!. The maximum possible power consumption
> is only 25W!.
> Now, that is life with modern CMOS, leakage is most of the power
> consumption....
> I think it will improve but 1:3 is the best you can expect for multi GHZ
> CPU's.
>
> The transmeta i am typing takes only 0.5W in Stopgrant but is performace
> is much less at
> "full power" of 5W/600MHz. Its standby to full power ration is 1:10, vs 2:3
> for P4EE's...
>
> So again, which (mainboard/notebook) HW does depower the CPU and keeps the
> rest running ?

> As to ACPI there should be a S2.5 state, or a S3 extension to power down
> the CPU and run the rest...

Does not that look close to S2?

> So, I stick to the validity of my original post :)

Okay, looks like I was wrong.

Pavel
--
People were complaining that M$ turns users into beta-testers...
...jr ghea gurz vagb qrirybcref, naq gurl frrz gb yvxr vg gung jnl!