Date: Thu, 8 Jan 2009 21:51:08 -0800 From: "Garrett Cooper" <yanefbsd@gmail.com> To: "Gabriel Lavoie" <glavoie@gmail.com> Cc: freebsd-acpi@freebsd.org Subject: Re: EST (Enhanced Intel SpeedStep(R) Technology) on amd64 Message-ID: <7d6fde3d0901082151t4901824cv84eb6c2be2658b15@mail.gmail.com> In-Reply-To: <d05df8620901081551j5572b45aqbed51e2955efccc8@mail.gmail.com> References: <d05df8620901081551j5572b45aqbed51e2955efccc8@mail.gmail.com>
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On Thu, Jan 8, 2009 at 3:51 PM, Gabriel Lavoie <glavoie@gmail.com> wrote: > Hello, > 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 http://www.daemonology.net/freebsd-est/ but it seems outdated and when 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? > > Thanks > > Gabriel > > -- > Gabriel Lavoie > glavoie@gmail.com Maybe this comment says why (from .../sys/i386/cpufreq/est.c)? /* * Frequency (MHz) and voltage (mV) settings. Data from the * Intel Pentium M Processor Datasheet (Order Number 252612), Table 5. * * Dothan processors have multiple VID#s with different settings for * each VID#. Since we can't uniquely identify this info * without undisclosed methods from Intel, we can't support newer * processors with this table method. If ACPI Px states are supported, * we get info from them. */ Colin could give you the definite answer, but I'm pretty sure that's it... Cheers, -Garrett
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