On 1/14/2010 1:12 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? I don't have an answer but out of curiosity, why would you move to a 4.x instead of 5.x now? You might be able to do some ps snapshots to see the process in R state, which is what the load average should be counting. That might be computed differently between the 2.4 and 2.6 kernels. -- Les Mikesell lesmikesell at gmail.com