[CentOS] High load since passing from rhas3 to centos4.8

Les Mikesell lesmikesell at gmail.com
Thu Jan 14 20:37:58 UTC 2010

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

More information about the CentOS mailing list