> -----Original Message----- > From: Peter Boy [mailto:pboy@xxxxxxxxxxxxxxxxxxxxx] > Sent: Thursday, November 20, 2003 1:27 AM > To: fedora-list@xxxxxxxxxx > Subject: Re: Speedstep Support via boot parameter doesn't work ? > > > > > Aslo, if you give the centrino module a range of frequencies, how > > does it decide what frequency to run the cpu at? > > That is the second part of my question. There is software > named cpufreqd > and cpudyn which will do some switching according to rules you can > define. But couldn't try it yet. If the centrino module does some > frequency switching for its own, it may conflict with software like > cpufreqd. If you look at the cpufreqd module... it's supposed to work in conjunction with the centrino module. Actually, the centrino module is just a frequency governor compiled into the kernel. That's why you get /proc/cpufreq in 2.4 series kernel and /sys/cpu????something in 2.6 series. (the /proc/cpufreq module is depreciate in 2.6 kernels) However, AFAIK there is no automatic scaling.. I'm talking in terms of RH9/centrino/2.4.22-rc2-ac3 custom kernel experience. FC1's kernel has some items which seems interesting to me in terms of laptop support(based on their release notes) but I've not installed it to determine if it would help me gain battery life. (I'm talking about bdflush, kjournal commit intervals, disk spinup/down etc..) Also since you mentioned the release notes also states : > It is also possible to set minimum, maximum, and policy using the > following boot-time parameter: > > cpufreq=<min>:<max>:<policy> That's exactly what cpufreqd does. you can also just do an echo 0:60000:140000:powersave (mine's a 1.4GHz Centrino) and cpu will drop to 600Mhz. Currently running on a Dell D600 with miserable batt life of 2:30 hours.
