From catalin@cs.toronto.edu Tue Oct 14 10:03:06 2003 Date: Mon, 6 Oct 2003 16:20:43 -0400 From: Catalin Drula To: Winnie Ka Tsang , David Kar-Fai Tam Subject: Re: Dynamic-voltage scaling on PDAs (project) (fwd) ---------- Forwarded message ---------- Date: Mon, 6 Oct 2003 14:40:43 -0400 From: Dave Jones To: Catalin Drula Subject: Re: Dynamic-voltage scaling on PDAs (project) On Mon, Oct 06, 2003 at 12:26:01PM -0400, Catalin Drula wrote: > my name is Catalin Drula and I am a Master's student in Computer Science > at the University of Toronto in Canada. I am doing a project with two > other classmates for our course "Mobile and Pervasive Computing". The > theme of this research project is quantifying the energy-savings of using > a scheduler with dynamic-voltage scaling support. We were planning to do > this on a PDA (handheld computer) by modifying the Linux kernel scheduler. Scheduler feedback to cpufreq has been on the wishlist for a while, the only thing holding back people from writing it was that someone (I forget who) holds several patents in this area. > The problem we have run into thus far is that there do not seem to be PDAs > which support dynamic-voltage scaling. There are some that support > frequency scaling, but none of them seem to support dynamic-voltage > scaling. Since the whole purpose of our project was to be able to "show" > our results on a "real" platform we are currently in a dead-end. > > Do you know of any PDAs/architectures which support dynamic-voltage > scaling? No idea, I concentrate entirely on the x86 side of cpufreq. You may have more luck asking on the cpufreq mailing list. Dave -- Dave Jones http://www.codemonkey.org.uk