Re: Pentium D 915 support

[Alexey Starikovskiy <alexey_y_starikovskiy@linux.intel.com>]

Thomas, please stop misinforming...
Thomas Renninger wrote:
> On Thu, 2006-08-03 at 13:48 +0200, Erik Slagter wrote:
>> On do, 2006-08-03 at 13:44 +0200, Thomas Renninger wrote:
>>>> Please note the amount of repeated same frequency.
>>> I already saw something similar.
>>> This is BIOS information, they probably want to take care that no
>>> performance is lost and define 9 high and one low step.
>> What do you mean?
> available frequency steps: 2.80 GHz, 2.80 GHz, 2.80 GHz, 2.80 GHz, 2.80
> GHz, 2.80 GHz, 2.80 GHz, 2.80 GHz, 2.80 GHz, 2.40 GHz
> 
> They define 9 2.8 GHz frequency steps and one 2.4 GHz.
> That means if OS is going down with speed step by step it will take a
> while until you reach 2.4 GHz.
Algorithm does not care about same P-steps. It will get to 2.4 in one step.
> This could be intended (avoid possible performance losses), but also
> just be a BIOS bug.
This is not BIOS bug, it is just a way to avoid dynamic memory allocation in BIOS.
And it has nothing to do with performance losses due to note above.

>>>> Last but not least: the loading or unloading of the module doesn't have
>>>> any effect on the actual power consumption, even with powersave governor
>>>> and both cores at 2.4 Ghz (both at 140 W).
>>> Strange. 2.4 GHz is still a lot?
>>>
>>> Have you already searched for a new BIOS, if not better do that first.
>> The only difference between my BIOS version and the one available for
>> download is the support for "new cpu's" according to the ASUS website.
> No idea whether it helps, but I would give it a try.

> 
> Maybe you find some specs on the Intel site what speed steps should be
> supported and how many power/temperature gain you can get. 2.4 GHz
> doesn't sound like you save a lot of energy...
Lowest frequency for P4 is 2.8 Ghz (14xFSB), PD is 2.4 (12xFSB), Core is 6x, but FSB is much higher.

Regards,
	Alex.