Date: Mon, 9 May 2005 13:07:19 +0200 From: Bruno Ducrot <ducrot@poupinou.org> To: Kevin Oberman <oberman@es.net> Cc: freebsd-acpi@freebsd.org Subject: Re: [powerd] mode adaptive2 Message-ID: <20050509110719.GL21800@poupinou.org> In-Reply-To: <20050504170550.6812F5D07@ptavv.es.net> References: <20050425172100.GU2298@poupinou.org> <20050504170550.6812F5D07@ptavv.es.net>
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On Wed, May 04, 2005 at 10:05:50AM -0700, Kevin Oberman wrote: > 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. I have seen your posts, and I will take care of them. > 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. Actually I would to add a some more sysctl, especially those: dev.cpu.*.freq_min and freq_max which would softlimit the available frequencies This could be wrapped by a powercontrol (?), but more importantly this will limit the max in case of passive cooling. > 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.) Its part of my TODO list.. > 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. -- Bruno Ducrot -- Which is worse: ignorance or apathy? -- Don't know. Don't care.
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