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тАО07-15-2009 05:36 AM
тАО07-15-2009 05:36 AM
I get following error messages (SLES 10 SP2)
rcpowersaved: CPU frequency scaling is not support by your processor
powernow-k8 - MP systems not supported by PSB BIOS Structure
Customer wants to lower the CPU frequency to save power when servers are idle ..
thanks,
larry.cole
Solved! Go to Solution.
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тАО07-15-2009 10:21 AM
тАО07-15-2009 10:21 AM
Re: DL785 - support for changing CPU frequency ?
Wrong forum.
Absolutely not. All warranties are void if you try a stunt like this.
You will not save power.
These systems are extremely low cost as it is. Very well optimized.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО07-15-2009 05:11 PM
тАО07-15-2009 05:11 PM
SolutionHP Dynamic Power Manager (BIOS does pstate changes)
Static High Performance (always in P0)
Static Low Performance (always in PN where N is the lowest pstate supported by the processors in the system)
OS Control Mode (OS does the pstate changes)
The default is the Dynamic Power Manager.
IIRC those first three will not populate the ACPI (?) structures the kernel is seeking to do its own power management. Only OS Control Mode does.
So, first you might just look at the power states graph from the iLO while your CPUs are idle and see if/that they are going to P4 already. If you don't "trust" the BIOS then you can switch the setting to OS Control Mode (requires a reboot) and put your faith in SLES 10 SP2.
FWIW, there are four SPECpower_ssj2008 submittals split between RHEL 5.3 and Windows and two different types of Opteron processors. Much use of the dynamic mode and less use of OS Control. Whether that will remain that way in the future of course depends :) The SPECpower_ssj2008 disclosures will show the range of power consumption for those configurations over a range of load levels (note N% load does not necessarily mean N% CPU util!) and you can see then how the power consumption drops as the load is lowered.
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тАО07-16-2009 04:23 AM
тАО07-16-2009 04:23 AM
Re: DL785 - support for changing CPU frequency ?
The SPEC results for RHEL system show 799 watts at 100% load and 444 watts at idle, so the default setting seems to be doing a reasonable job ?
http://www.spec.org/power_ssj2008/results/res2009q1/power_ssj2008-20090210-00113.html
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тАО07-16-2009 08:41 AM
тАО07-16-2009 08:41 AM