On Thu, Jan 14, 2010 at 2:12 PM, <fortin.pierre at bell.ca> wrote: > 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?