Hi! > > This patch takes advantage of the infrastructure introduced in the last > > patch, and allows the processor idle algorithm to proactively choose a > > c-state based on the time the next timer interrupt is expected to occur. > > It preserves the residency metric, so the algorithm should, in theory, > > remain effective against bursts of activity from other interrupt > > sources. > > > > This patch is mostly intended to be illustrative. There may be some > > "#ifdef CONFIG_ACPI" issues, and I would appreciate any advice on > > implementing this more cleanly. Okay, just to get you some feedback: It seems to change things a _lot_. Power consumption with usb modules loaded went from 14315mW to 13800mW -- that is huge deal. Unfortunately something strange is going on: with stock kernel, power consumption is mostly constant. With your patch, it varies a lot, at 2 second timescale. Power consumption with usb unloaded (only way to get reasonable power on x60) went from stable 10450mW to something rapidly changing, and probably even worse than original: current average -11200 mW avg -11274 mW -10505 mW avg -11251 mW -11701 mW avg -11238 mW -11975 mW avg -11348 mW -10432 mW avg -11313 mW -11944 mW avg -11422 mW -10683 mW avg -11504 mW -10682 mW avg -11457 mW -10402 mW avg -11432 mW -11913 mW avg -11317 mW -12004 mW avg -11541 mW -12004 mW avg -11661 mW -11945 mW avg -11781 mW -11943 mW avg -11824 mW -12577 mW avg -11891 mW -12004 mW avg -11930 mW -12019 mW avg -11944 mW -11972 mW avg -12002 mW -12004 mW avg -11990 mW -11913 mW avg -12032 mW -11083 mW avg -11903 mW Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
