Date: Fri, 09 Jan 2009 10:51:27 +0200 From: Alexander Motin <mav@mavhome.dp.ua> To: Gabriel Lavoie <glavoie@gmail.com> Cc: freebsd-acpi@freebsd.org Subject: Re: EST (Enhanced Intel SpeedStep(R) Technology) on amd64 Message-ID: <4967100F.8040303@mavhome.dp.ua> In-Reply-To: <1231471393.00057821.1231461001@10.7.7.3> References: <1231471393.00057821.1231461001@10.7.7.3>
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Gabriel Lavoie wrote: > I recently built a small home server using an Inten 45nm E5200 @ > 2.5 GHz. With FreeBSD 7.0, the "est" driver had problems pooling for > the CPU frequency/voltage pairs and automatically disabled itself. It > left the CPU at the frequency the BIOS put it after startup, 1.25 GHz > because I have EIST enabled. I had to manually change the frequency or > use powerd to put it at maximum. Now I upgraded to FreeBSD 7.1 and > everything in my systems seems supported correctly. The est driver now > recognize the CPU and load the correct information. Also, after > bootup, the frequency of the CPU is at max (2.5 GHz). What I would > like is to get the behaviour of EIST found under Windows and Linux > where the CPU is automatically downclocked to 1.25 GHz when the system > isn't under any load, but comes back to 2.5 GHz as soon as there is > some load. I also get this behaviour under Linux on my Core 2 Duo and > I really like it. What I found interesting is that it seems the Intel > 45nm CPUs use under 5W of power when they are idle and EIST > downclocked them. I would really like to take profit of this low power > consumption. I found about "estctrl" on this page > http://www.daemonology.net/freebsd-est/ but it seems outdated and when > I try to build the port, it tells me that it is only supported on the > i386 architecture. Why not amd64? man powerd? -- Alexander Motin
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