Date: Wed, 04 May 2005 10:05:50 -0700 From: "Kevin Oberman" <oberman@es.net> To: Bruno Ducrot <ducrot@poupinou.org> Cc: freebsd-acpi@freebsd.org Subject: Re: [powerd] mode adaptive2 Message-ID: <20050504170550.6812F5D07@ptavv.es.net> In-Reply-To: Your message of "Mon, 25 Apr 2005 19:21:00 %2B0200." <20050425172100.GU2298@poupinou.org>
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Bruno, I have posted most of this in the past, but I'll repeat it as you are talking about some of the same things. We need a mechanism (powercontrol?) to talk to the powerd as it is running. Among the things it should be able to do is to set a pseudo min and max speed. for the system. This would put absolute limits on how fast/slow powerd would ever set the speed. The ability to change this is important as you would likely want this to be different for battery and AC operation, especially at the high end. I want the Gnome CPU Frequency applet to be able to set these. (I assume that KDE has/will have something similar.) I also want to eliminate poor choices for frequency. As I have noted, on my T30 with a P4m CPU offering ICH Speedstep and TCC I only get useful power reductions when using the lower CPU speed when the frequency selected is below the lower available Speedstep setting. (I only have two, 1.8 and 1.2 GHz.) I also have a problem in that when TCC and Speedstep can provide the same pseudo-frequency at either Speedstep setting, the faster CPU setting is chosen. This "costs" me two settings. If I ever get a few minutes I'll look at adjusting the source to fix this, but I've just been too busy and will likely continue to be for a while. (I think you had previously commented on this problem.) I also need to do more actual testing of CPU performance vs. power consumption. I have tested under high CPU load, but not at idle and I really need to do that, too. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634
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