Date: Sat, 17 Dec 2005 16:13:59 -0800 From: "Kevin Oberman" <oberman@es.net> To: martinko <martinkov@pobox.sk> Cc: Melvyn Sopacua <freebsd.stable@melvyn.homeunix.org>, freebsd-stable@freebsd.org Subject: Re: HEADS UP: Release schedule for 2006 Message-ID: <20051218001359.46E495D07@ptavv.es.net> In-Reply-To: Your message of "Sat, 17 Dec 2005 18:14:01 %2B0100." <43A44759.805@pobox.sk>
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> Date: Sat, 17 Dec 2005 18:14:01 +0100 > From: martinko <martinkov@pobox.sk> > > Kevin Oberman wrote: > >>Date: Fri, 16 Dec 2005 14:29:39 -0600 > >>From: Craig Boston <craig@feniz.gank.org> > >>Sender: owner-freebsd-stable@freebsd.org > >> > >> > >>>-cpu0: <ACPI CPU (4 Cx states)> on acpi0 > >>>+cpu0: <ACPI CPU> on acpi0 > >>> > >>>Q: Guessing that's a formatting difference, rather then 6.x not recognizing > >>>the states (sysctl hw.acpi.cpu.cx_supported confirms 4 states) > >> > >>Not sure on this, but you're probably better off using EST anyway as I > >>think it gives you more control over the processor frequency. > > > > > > No. There is no conflict between Cx states and EST. Cx states specifies > > how deeply the CPU will sleep when idle. EST controls processor speed > > and voltage. In most cases, your REALLY want to use both of these. They > > are very significant in saving power. (Of course, USB tends to limit the > > effectiveness of Cx states. I need to run without USB to get really good > > battery life and to make suspend (S3) really ut power drain. > > > Kevin, > > I used to have 3 Cx states supported when I started with FreeBSD on > version 5.3. Since I upgraded to 5.4 and recently to 6.0, all I can see > is just one supported Cx state. I much wonder why. (?) What value do you have in /etc/rc.conf (if any) for performance_cx_lowest? It defaults to HIGH which will limit you to only the most power hungry sleep state (simple halt). This was made the default because some hardware was breaking when this was defaulted to LOW. T0 get other Cx states to be utilized, add 'performance_cx_lowest="LOW"' to /etc/rc.conf. -- 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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