Just noticed that CentOS has the “cpuspeed” service that throttles the CPU and causes my pages to parse 2X slow.
# service cpuspeed status
Frequency scaling enabled using ondemand governor# cat /proc/cpuinfo
model name : Intel(R) Xeon(R) CPU X5570 @ 2.93GHz
stepping : 5
cpu MHz : 1600.000
and to disable it
# service cpuspeed stop
Disabling ondemand cpu frequency scaling: [ OK ]
# chkconfig cpuspeed off# cat /proc/cpuinfo
model name : Intel(R) Xeon(R) CPU X5570 @ 2.93GHz
stepping : 5
cpu MHz : 2934.000
page generations and mysql queries are 2X faster now.
