Hi, I have a fedora22 SuperMicro system operating as a mail server that has no need to have the CPU throttled. I'm having trouble figuring out how to disable the throttling. There also doesn't appear to be any recent threads discussing this previously. It appears some are running at full speed while others are not: # cat /proc/cpuinfo |grep Hz model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz cpu MHz : 1875.187 model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz cpu MHz : 2188.687 model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz cpu MHz : 2399.906 model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz cpu MHz : 1475.812 model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz cpu MHz : 2075.437 model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz cpu MHz : 2340.750 model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz cpu MHz : 1262.062 model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz cpu MHz : 2111.812 I've searched for the programs I've used in the past, including cpuspeed and cpufreq-* but they appear to no longer exist. I've looked in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor and all are set to "performance". What is the procedure for disabling CPU throttling permanently? Thanks, Alex

On one of my machines: # cat /proc/cpuinfo | grep Hz model name : Intel(R) Core(TM) i5 CPU M 560 @ 2.67GHz cpu MHz : 2667.000 model name : Intel(R) Core(TM) i5 CPU M 560 @ 2.67GHz cpu MHz : 2667.000 model name : Intel(R) Core(TM) i5 CPU M 560 @ 2.67GHz cpu MHz : 2667.000 model name : Intel(R) Core(TM) i5 CPU M 560 @ 2.67GHz cpu MHz : 2667.000 Notice there is no throttling. I have the following entry in a file that is executed when system comes up: /bin/cpupower --cpu all frequency-set -g performance 2.67G

Is there a kernel thread running called: acpi_thermal_pm ?

Hi, I have a fedora22 SuperMicro system operating as a mail server that has no need to have the CPU throttled. I'm having trouble figuring out how to disable the throttling. There also doesn't appear to be any recent threads discussing this previously. It appears some are running at full speed while others are not: # cat /proc/cpuinfo |grep Hz model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz cpu MHz : 1875.187 model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz cpu MHz : 2188.687 model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz cpu MHz : 2399.906 model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz cpu MHz : 1475.812 model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz cpu MHz : 2075.437 model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz cpu MHz : 2340.750 model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz cpu MHz : 1262.062 model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz cpu MHz : 2111.812

I've searched for the programs I've used in the past, including cpuspeed and cpufreq-* but they appear to no longer exist. I've looked in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor and all are set to "performance". What is the procedure for disabling CPU throttling permanently? Thanks, Alex

Hi, On Mon, Nov 30, 2015 at 9:54 PM, Kevin Cummings <cummings(a)kjchome.homeip.net&gt; wrote: > On 11/27/15 15:05, Alex wrote: >> Hi, >> I have a fedora22 SuperMicro system operating as a mail server that >> has no need to have the CPU throttled. I'm having trouble figuring out >> how to disable the throttling. There also doesn't appear to be any >> recent threads discussing this previously. >> >> It appears some are running at full speed while others are not: >> >> # cat /proc/cpuinfo |grep Hz >> model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz >> cpu MHz : 1875.187 >> model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz >> cpu MHz : 2188.687 >> model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz >> cpu MHz : 2399.906 >> model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz >> cpu MHz : 1475.812 >> model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz >> cpu MHz : 2075.437 >> model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz >> cpu MHz : 2340.750 >> model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz >> cpu MHz : 1262.062 >> model name : Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz >> cpu MHz : 2111.812 > > My understanding of CPU throttling allows the CPUs to run at full speed > when they are busy, and to be throttled back when they are idle. > > Are you sure that each CPU was engaged in doing work when you queried > their speeds? > > It is designed to allow laptops to idle (and not generate as much heat) > when they don't have to. It is *not* a permanent throttling back of the > CPUs denying you possible better computing speeds. Instead it is > designed to have the CPUs (cores) generate less heat when they are not busy. > > I have a CPU Frequency Scaling Monitor installed in a panel on my > laptop, and I can watch the CPU speeds change (increase and decrease) > with the workloads as processes come and go. Thanks for the info. In the past, the system wasn't responsive enough to adjust the CPU as load increased. It seems with recent processors, the technology is a lot more sophisticated and no longer really possible to control its speed.