We are migrating HP servers from RHAS3 to centos 4.8. Since, the load average is reaching really high values. Under usage we see loads of 15-20 instead of the 0.5-1.5 we were used to.
I searched a lot for information on such an issue. Iostat, vmstat, top, ps. But I don't get significant hint.
Cpu usage remains low, IO wait remains low, no disks are lagging, no swap usage.
Are there some tool / other way to diagnose why the load average is high? Like which processes are waiting, where they are stuck. Are there calls to drivers or system process that are slow?
Are you by any chance now running a CPU throttling program and weren't >before?
ACPI is not enabled. Other than that I couldn't tell. Sorry if it sounds noob. What can I check to be sure nothing is throttling the CPU?
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