[Sorry if this gets through twice: I messed up last time...] Hi,
I have moved a whole bunch of servers off a rack of Solaris machines and onto a single Linux laptop which I am trying to run on low-enough power to run off solar PV for as much of the time as possible (see http://www.earth.org.uk/low-power-laptop.html) and total power use has come down from ~670W to <30W on mains (<20W powered from solar PV via an efficient DC/DC converter). But I'm not sure how far further I can push the h/w I have. For example, it doesn't show C3 or C4 states available which is a shame since it is 99% idle (most time is spent in C2). Also, it doesn't show HPET as being available, which results in ~50 extra wakeups per second. Now I *am* running a bunch of DNS, NTP, SMTP, and HTTP servers on that (Core Duo T2250) machine, albeit quiet ones, that generate ~30+ wakeups per second themselves legitimately. Is it worth trying to force activate HPET, C3 ad C4? How can I safely do it if so? I have looked at the BIOS with dmidecode and biosdecode, and don't get any great clues. I have played with building a previous kernel but am now simply running a stock (22-rc7) Ubuntu "Gutsy" kernel in my "Feisty" system. I am using cpufreqd/ondemand which I have tuned as good as I can get (quick builds, idles in lowest freq ~99%). I am using laptop-mode. And of course I have used powertop to help tune userspace and cpufreqd, which is why I am here! Rgds Damon _______________________________________________ Power mailing list [email protected] http://www.bughost.org/mailman/listinfo/power
