Date: Wed, 21 Mar 2012 08:41:36 +0100 From: Matthias Gamsjager <mgamsjager@gmail.com> To: John <john@theusgroup.com> Cc: freebsd-stable@freebsd.org Subject: Re: powerd and increase in energy need Message-ID: <CA%2BD9QhsMMXYbLKg__jZx=7KbCHtK6LjqkfL9WSWs=pdT-t9r0w@mail.gmail.com> In-Reply-To: <20120321000058.177F8256@server.theusgroup.com> References: <CA%2BD9Qhv5EmrkqvLetx9T5WD_1BRuCpUyZ=VYnRSjwRYqA7phdg@mail.gmail.com> <20120321000058.177F8256@server.theusgroup.com>
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On Wed, Mar 21, 2012 at 1:00 AM, John <john@theusgroup.com> wrote: > >my zfs nas has an Asus p5e motherboard (x38 chip) and an intel q9300 (quad > >core 2,5Ghz) processor with all the energy save setting enabled in the > >bios. Today I connected the power cord to a voltcraft energy meter to see > >how much energy the whole system needs in idle mode. > > > >I found out that with powerd running the cpu get clocked down to 499 mhz > >with is nice. The funny thing is that this doesn't decrease the amount of > >watts the machine need. 2,5ghz or 499mhz doen't matter at all. It gets > even > >funnier. With powerd running the systems actually needs 4 watts more then > >without powerd running. > > > >Isn't the whole point of powerd to to decease the energy needs of a > >machine? or is it utterly broken with this cpu generation? > > Powerd does decrease energy on my more modern hardware. This machine is > used > for backups and is idle much of the time. It runs Freebsd 8.3-Prerelease > with > the turbo-boost patch on an i5-650 in an intel DH55HC motherboard. > > The following power measurements were made with a Kill-A-Watt meter. > > 91w while doing a compile, dev.cpu.0.freq: 3193 (turbo boost enabled) > 81w compile complete, disks quiet, top reports between 99.9 and 100% idle > dev.cpu.0.freq: 3193 > 71w idle for several seconds, powerd running in hiadaptive mode, > dev.cpu.0.freq: 1197 > > > sysctl dev.cpu |grep cx > dev.cpu.0.cx_supported: C1/3 C2/205 C3/245 > dev.cpu.0.cx_lowest: C2 > dev.cpu.0.cx_usage: 100.00% 0.00% 0.00% last 259us > > sysctl dev.cpu |grep freq ~ > dev.cpu.0.freq: 1197 > dev.cpu.0.freq_levels: 3193/9875 3192/9125 3059/8250 2926/7500 2793/6875 > 2660/6250 2527/5750 2394/5250 2261/4750 1197/2750 > > /etc/rc.conf > powerd_flags="-n hadp" > performance_cx_lowest="C2" > economy_cx_lowest="C2" > performance_cpu_freq="HIGH" > > John Theus > TheUs Group > TheUsGroup.com > I will give these setting a try thx..
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