Re: Is the C3 possible with SMP?
Alexander Motin <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.mobile,gmane.os.freebsd.devel.acpi |
|---|---|
| Message-ID | <[email protected]> |
Alexandre "Sunny" Kovalenko wrote: > When laptop is moving around with me, all USB modules are unloaded and I I will try to unload USB later today. > get about 4 hours of battery life with wireless on, admittedly on the > light usage (reading/writing E-mails, browsing web, typing up occasional > document). I consider this good for 4.4lbs (<2kg) laptop. I have a bit more then 3 hours at the same weight. Which CPU, video and chipset do you have? > OK, so we have C3. Is this the machine you see no difference in power > consumption between C3 and no C3? How did you measure it? Yes. I am using `acpiconf -i 0`. I have no way to measure AC power and I am not sure in precision of such measurements due to limited AC power supply effectiveness. I have some doubts that C3 on only one of two cores could give much benefit. I have already lowered frequency and voltage via EST by powerd. I have turned off most of CPU clocks with Core2Duo C2E state. So, according to what I have read, now only APICs and bus controller are active. As soon as I see timer interrupt on cpu1 it's APIC is not sleeping. Bus controller is shared by cores, so it can't be disabled until at least one core is active. -- Alexander Motin _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-mobile To unsubscribe, send any mail to "[email protected]"