On Thu, Jul 27, 2006 at 07:14:00PM +0200, Hans-J. Ullrich wrote: > today I have an unusual thouhgt: I am looking for a tool, which I want to > start on the notebook, when doing nothing. I do NOT mean powernowd, cpufreqd > or similar, which use the pins on the cpu to switch it down (on my AMD-Turion > to 800MHz) I am looking for a tool like those on windows in the early 486er > days: they were called "waterfall" or "raindrop" and could change the > cycle-rate from i.e. 100 MHz to 10 MHz. > > Does somebody know such a tool for linux ? Or is this on modern cpus not more > needed !
You just described cpufreq. Just use a kernel with cpufreq support and use the "ondemand" or "conservative" governor to let the CPU switch to various frequencies. Note that you can't decrease the clock frequency on a 486 without extensive hardware support on the motherboard. Some 486 notebooks had such hardware (my old Digital notebook, for example), but the programming interface was non-standard: the Digital tools certainly didn't work on Compaq notebooks. > I imagine, with these tools, power would last much longer, when I can bring > my > processor down to 100MHz. > > Or do I think wrong ???? Yes and no. Subtle detail: you don't want to save power, you want to save *energy*. See my OLS 2002 CPUfreq paper: http://www.lartmaker.nl/projects/scaling/cpufreq.ps.gz Erik -- +-- Erik Mouw -- www.harddisk-recovery.com -- +31 70 370 12 90 -- | Lab address: Delftechpark 26, 2628 XH, Delft, The Netherlands -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
