RHEL Kernel Performance Optimization, Characterization ... - Red Hat

RHEL5.2 CPUspeed and performance:Enabled = governor set to “ondemand”Looks at cpu usage to regulate power●Within 3­5% of performance for cpu loads●IO loads can keep cpu stepped down ­15­30%Supported in RHEL5.2 virtualizationTo turn off – else may leave cpu’s in reduced step●If its not using performance, then:●# echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor●Then check to see if it stuck:●# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor●Check /proc/cpuinfo to make sure your seeing the expected CPU freq.Proceed to “normal” service disable●●Service cpuspeed stopChkconfig cpuspeed off