CentOS - Jan 2010 - High l-avg with centos 4.8 on G2 only

Hi

We deployed centos 4.8 on HP DL380 G2, G3 and G4 servers (same number of cpus).
The same software is running on all servers.
Only on G2 servers we see a low cpu utilization combined with high load-average.
For example, during the same time of day and same workload, on a G2 I see a
l-avg of 11.31 and on a G4 I see 2.68.

The server response time seems unchanged and we don't have any problem with
it so far, but I need to figure out why the l-avg remains high.
We were running redhad AS 3 before, and the l-avg was low on all server type.

Anyone have an idea where I should look.
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Am Dienstag, den 05.01.2010, 16:51 +0100 schrieb fortin.pierre at
bell.ca:
> Hi
>
>
>
> We deployed centos 4.8 on HP DL380 G2, G3 and G4 servers (same number
> of cpus). The same software is running on all servers.
>
> Only on G2 servers we see a low cpu utilization combined with high
> load-average.
>
> For example, during the same time of day and same workload, on a G2 I
> see a l-avg of 11.31 and on a G4 I see 2.68.
>
>
>
> The server response time seems unchanged and we don?t have any problem
> with it so far, but I need to figure out why the l-avg remains high.
>
> We were running redhad AS 3 before, and the l-avg was low on all
> server type.
>
>
>
> Anyone have an idea where I should look.
>
>
Try "iostat -x 10" and look if the disks are busy.

Chris


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On Tue, Jan 5, 2010 at 8:51 AM,  <fortin.pierre at bell.ca>
wrote:
> Hi
>
>
>
> We deployed centos 4.8 on HP DL380 G2, G3 and G4 servers (same number of
> cpus). The same software is running on all servers.
>
> Only on G2 servers we see a low cpu utilization combined with high
> load-average.
>
> For example, during the same time of day and same workload, on a G2 I see a
> l-avg of 11.31 and on a G4 I see 2.68.
>
Make sure you have updated the G2 BIOS boxes. Some of the HP DL380's
had ACPI issues with NUMA memory causing 'phantom' loads as the system
took longer to page stuff. The box I dealt with was fixed with an
updated BIOS. If that doesn't work.. look at the various ACPI options
to tune the kernel.






-- 
Stephen J Smoogen.

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