Date: Mon, 16 Aug 2004 14:21:57 -0400 From: Jung-uk Kim <jkim@niksun.com> To: freebsd-current@freebsd.org Cc: freebsd-mobile@freebsd.org Subject: Re: Enhanced SpeedStep driver available Message-ID: <200408161421.57239.jkim@niksun.com> In-Reply-To: <4120F823.2040802@portaone.com> References: <6.1.0.6.1.20040816074348.03f99338@popserver.sfu.ca> <4120F823.2040802@portaone.com>
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On Monday 16 August 2004 02:08 pm, Maxim Sobolev wrote: > Colin Percival wrote: > > Thanks to everyone who has been sending me data about their > > processors (and in particular, the 90nm versions), I now have > > a first draft of a Enhanced SpeedStep driver available. For > > people with the appropriate processors (Pentium M only), this > > makes it possible to adjust the cpu frequency via a new sysctl > > (hw.est_curfreq), and have the cpu voltage adjusted at the > > same time. > > I've also put together a very simple control daemon which > > reads kern.cp_time every second and adjusts the cpu frequency > > based on the fraction of cpu time which is idle. This increases > > my laptop's battery life by around 40%. > > It would be nice if you can extend it to use whatever speed control > method is available (e.g. ACPI, TCC, ESS etc), so that it can be > used on older machines as well. I found ACPI driver here: http://www.spa.is.uec.ac.jp/~nfukuda/software/ FYI... Jung-uk Kim > -Maxim > > > All the code is online at > > http://www.daemonology.net/freebsd-est/ > > Assuming I don't hear any major bug reports in the next few > > days, I'll package these into ports and hopefully get them into > > the ports tree in time for 5.3-RELEASE. > > > > Colin Percival
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