Thanks for the informative links. I'm amazed at how much of the power usage is just in the CPU. So all the performance states (i.e. going to 1000 Hz) still keeps you in C0? It would be interesting to find out how much support Linux has for these C-states. I would guess that it supports them to some degree since in his tests on the Dell Linux didn't do that much worse than XP (by a factor of 10-15% maybe). Perhaps the problem is that the EFI is not exposing the power states to Linux.
Is anybody on the development list (who I guess also read the user list so I won't cross post) familiar with these power states and how they are exposed to Linux? Perhaps this is an EFI issue? Sheer On 4/5/07, Sven Anders <[EMAIL PROTECTED]> wrote: > Kai Weber schrieb: > > * Sheer El-Showk <[EMAIL PROTECTED]>: > >> same would hold for the GPU. Otherwise I really have no idea what > >> could be burning so much power in linux. > > > > Maybe the processors power management features are not supported under > > Linux: > > http://www.intel.com/technology/itj/2006/volume10issue02/art03_Power_and_Thermal_Management/p02_intro.htm > > This is difficult to say, because the BIOS plays a role in it... > > This gives a short overview: > http://www.linux-pm.org/docs/pm-summit-0406-acpi.pdf > > The interesting part is these: > > C-states in Linux > * OS visible C-states != hardware C-states > – BIOS decides what to expose to the OS > * _CST support > – "processor.nocst" can disable it > * SMP deep C-state support > – "processor.max_csate=n" can reduce it > > > I do not know of any way to tell, which deeper sleep state are used... > Maybe another problem will be, that Linux does not switch directly into some > of the deeper C states. > > I found a patch, which will change the usage of the C states, but it's not > the newest (and I did not found any newer version of it) and I had no time to > test it. Here it is: > > http://www.thisishull.net/archive/index.php/t-203606.html > > > Regards > Sven > > -- > Sven Anders <[EMAIL PROTECTED]> () Ascii Ribbon Campaign > /\ Support plain text e-mail > ANDURAS service solutions AG > Innstraße 71 - 94036 Passau - Germany > Web: www.anduras.de - Tel: +49 (0)851-4 90 50-0 - Fax: +49 (0)851-4 90 50-55 > > Rechtsform: Aktiengesellschaft - Sitz: Passau - Amtsgericht Passau HRB 6032 > Mitglieder des Vorstands: Sven Anders, Marcus Junker > Vorsitzender des Aufsichtsrats: Dipl. Kfm. Thomas Träger > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share your > opinions on IT & business topics through brief surveys-and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > Mactel-linux-users mailing list > Mactel-linux-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/mactel-linux-users > > > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Mactel-linux-users mailing list Mactel-linux-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mactel-linux-users
