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cpufreq directory not present. How to change governor for P states in such a case


 
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Old 10-27-2009
cpufreq directory not present. How to change governor for P states in such a case

One node in my cluster is using ondemand governor which is specified in the directory
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor ..
Scaling_governor allows us to choose the governor of our choice .
But this sub-directory is absent in the other node of the cluster . How do I change the governor for Pstates in such case ?

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TUNED_ADM(8)							       tuned							      TUNED_ADM(8)

NAME
tuned-adm - commandline tool for switching between different tuning profiles SYNOPSIS
tuned-adm [ list , active , profile <profile> , off ] DESCRIPTION
This command line utility allows user to switch between user definable tuning profiles. Several predefined profiles are already included. You can even create your own profile, either based on one of the existing ones by copying it or make a completely new one. The distribution provided profiles are stored in subdirectories below /usr/lib/tuned and the user defined profiles in subdirectories below /etc/tuned. If there are same profiles on both places, user defined profiles have precedence. The power saving profiles contain settings that are typically not enabled by default as they will noticeably impact the latency/performance of your system as opposed to the power saving mechanisms that are enabled by default. On the other hand the performance profiles disable the additional power saving mechanisms of tuned as they would negatively impact throughput or latency. OPTIONS
list List all available profiles. active Show current active profile. profile <profile> Switches to the given profilename. If none is given or no valid one is given the command gracefully exits without performing any operation. recommend Recommend profile suitable for your system. Currently only static detection is implemented - it decides according to data in /etc/system-release-cpe and virt-what output. The rules for autodetection are defined in recommend.conf in profile directory. They can be overriden by user by putting the recommend.conf into /etc/tuned. The default rules recommends profiles targeted to the best performance or balanced profile if unsure. off Switch off tuned. PREDEFINED PROFILES
At the moment we're providing the following pre defined profiles: balanced It is the default profile. It provides balanced power saving and performance. At the moment it enables CPU and disk plugins of tuned and it makes sure the ondemand governor is active (if supported by the current cpufreq driver). It sets the CPU energy perfor- mance bias to normal. It also enables AC97 audio power saving or (it depends on your system) HDA-Intel power savings with 10 seconds timeout. In case your system contains supported Radeon graphics card (with enabled KMS) it configures it to automatic power saving. powersave Maximal power saving, at the moment it enables USB autosuspend (in case environment variable USB_AUTOSUSPEND is set to 1), enables ALPM power saving for SATA host adapters, enables WiFi power saving, enables multi core power savings scheduler for low wakeup sys- tems and makes sure the ondemand governor is active (if supported by the current cpufreq driver). It sets the CPU energy performance bias to powersave. It also enables AC97 audio power saving or (it depends on your system) HDA-Intel power savings (with 10 seconds timeout). In case your system contains supported Radeon graphics card (with enabled KMS) it configures it to automatic power sav- ing. On Asus Eee PCs dynamic Super Hybrid Engine is enabled. throughput-performance Profile for typical throughput performance tuning. Disables power saving mechanisms and enables sysctl settings that improve the throughput performance of your disk and network IO. CPU governor is set to performance and CPU energy performance bias is set to performance. Disk readahead values are increased. latency-performance Profile for low latency performance tuning. Disables power saving mechanisms. CPU governor is set to performance andlocked to the low C states (by PM QoS). CPU energy performance bias to performance. network-throughput Profile for throughput network tuning. It is based on the throughput-performance profile. It additionaly increases kernel network buffers. network-latency Profile for low latency network tuning. It is based on the latency-performance profile. It additionaly disables transparent hugepages, NUMA balancing and tunes several other network related sysctl parameters. desktop Profile optimized for desktops based on balanced profile. It additionaly enables scheduler autogroups for better response of inter- active applications. virtual-guest Profile optimized for virtual guests based on throughput-performance profile. It additionally decreases virtual memory swapiness and increases dirty_ratio settings. virtual-host Profile optimized for virtual hosts based on throughput-performance profile. It additionally enables more aggresive writeback of dirty pages. sap Profile optimized for the best performance of SAP software. It is based on throughput-performance profile. It additionally tunes sysctl settings regarding shared memory, semaphores and maximum number of memory map areas a process may have. PREDEFINED COMPAT PROFILES
We are also providing so called "compat" profiles that are here mostly for backward compatibility with tuned 1.0. They are oriented to more specific scenarios. default It is the lowest of the available profiles in regard to power saving and only enables CPU and disk plugins of tuned. desktop-powersave A power saving profile directed at desktop systems. Enables ALPM power saving for SATA host adapters as well as the CPU, ethernet and disk plugins of tuned. server-powersave A power saving profile directed at server systems. Enables ALPM power saving for SATA host adapters, and activates the CPU and disk plugins of tuned. laptop-ac-powersave Medium power saving profile directed at laptops running on AC. Enables ALPM power saving for SATA host adapters, WiFi power saving as well as CPU, ethernet and disk plugins of tuned. laptop-battery-powersave Strong power saving profile directed at laptops running on battery. Currently an alias to powersave profile. spindown-disk Strong power saving profile directed at machines with classic HDDs. It enables aggressive disk spin-down. Disk writeback values are increased and disk swappiness is lowered. Log syncing is disabled. All partitions are remounted with 'noatime' option. All tuned plugins are disabled. enterprise-storage Server profile for high disk throughput performace tuning. Disables power saving mechanisms and enables deadline IO scheduler. Enables hugepages and disables disk barriers. Disk readahead values are increased. CPU governor is set to performance. FILES
/etc/tuned/* /usr/lib/tuned/* SEE ALSO
tuned(8) tuned-conf(5) AUTHOR
Jan Kalua <jkaluza@redhat.com> Jan Velak <jvcelak@redhat.com> Jaroslav karvada <jskarvad@redhat.com> Marcela Malaova <mmaslano@redhat.com> Phil Knirsch <pknirsch@redhat.com> Fedora Power Management SIG 28 Mar 2012 TUNED_ADM(8)

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