December 27, 2008 at 12:31 am #160282soutthpawMember
I am noticing that my CPU speed is stuck often at 1.6Ghz even when I engage the Samsung Battery manager to max battery or my customized battery setting of min CPU speed. sometimes it shows 800Mhz but it seems to have a mind of its own.
anyone have similare problem or any ideas? is there a way to control CPU speed without using the battery manager application. I would like to remove that app all together if I can find a way to control CPU speed outside of the app
I am using BattStat to monitor CPU speed and activityDecember 27, 2008 at 12:56 am #177467AlfiharParticipant
There should be ways of controlling the CPU speed though I can’t really help with that.
I’ve been playing around and fixed the CPU speed to 800MHz on mine a few times though I didn’t notice much difference in power consumption.
However one thing to consider is whether having the CPU run a task for longer on the slower P state is actually more efficient than ramping up the P state to finish a task quickly and then ramp down. I read a while back (I’ll see if I can find a link) that it was generally slightly more efficient to let the CPU ramp up and down the P state rather than fixing it.
I’m more concerned with the C state rather than the P state though.
EDIT: Not quite what I was thinking of but here is a LINK regarding racing to idle on the LessWatts.org site run by Intel.December 27, 2008 at 1:52 am #177469soutthpawMember
Well I googled C-States as I did not know what they were. It seems as though if you have C-States enabled in the bios, then the processor manages it speed and sleep states itself. Therefore, is there really any advantage to running an additional piece of software (samsung battery manager, SBM) to regulate the CPU speed? another article I found said that there is reall no power savings if the slower CPU has to run longer than the CPU at full speed to do the same task. So for now I uninstalled SBM and will run for a while with BattStat and see if I notice any difference. I’m trying to get rid of extra programs that are not really benefiting anything. I can control Display setting and shutdown, idle times etc through XP’s standard power management options.December 27, 2008 at 12:11 pm #177468AlfiharParticipant
The C states should be managed automatically, though the P states can be controlled by the OS. Although the C states are managed automatically the amount of time spent in the lowest power state is dependant on software not waking up the CPU. I can get mine to stay in C4 around 80% of the time while idle now (with both radios on and compiz enabled).
Now as for the Samsung Battery Management software, it may do more than just regulate the CPU speed. It may do things like changing the power settings for other pieces of hardware such as the radios, sound card, SATA link, hard drive etc… then again it may not be that advanced.
It will be interesting to see if you notice any difference in power consumption.
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