R: High load average but low cpu (xenomai can be the explanation?)

[Bosi Daniele]

I suggest you to take a look at the meaning of the data showed by "/proc/loadavg".

See:
http://www.luci.org/luci-discuss/200210/msg00055.html

for more details.

In my opinion your loadavg of 3.0 means only that in your application there is an average of 3 task waiting for running on the CPU. This in general doesn't mean that the CPU load must be 100 %.

Maybe there should be some scheduler issues.

If you take a look into your app sources maybe you can know more about what happens.


-----Messaggio originale-----
Da: dibacco at libero.it [mailto:dibacco at libero.it]
Inviato: martedì 22 settembre 2009 10.15
A: Bosi Daniele; linuxppc-dev at lists.ozlabs.org
Oggetto: R: High load average but low cpu (xenomai can be the explanation?)

It is an AgentX subagent, it does a lot of things like accessing the hardware,
handling messages from the main snmp agent received from an unix socket,
writing files on jffs2 partition, polling hardware for alarms.
If I kill it,
the load goes down. Anyway the subagent only takes 2-3% of the CPU..

Thank
you,
Antonio.



>Da: Daniele.Bosi at mta.it
>
>Can you give us some more details
about your app?
>Is it multithread or single process?
>What do the process do?

>
>Bye Daniele
>
>
>
>-----Messaggio originale-----
>Da: linuxppc-dev-
bounces+daniele.bosi=mta.it at lists.ozlabs.org [mailto:linuxppc-dev-
bounces+daniele.bosi=mta.it at lists.ozlabs.org] Per conto di dibacco at libero.it

>Oggetto: High load average but low cpu (xenomai can be the explanation?)
>

>Hi,
>
>I have an MPC880 @133MHz. If I look into the load (with uptime) I get

>values around 3.0 but my CPU is always under 5 percent (top). How could I

>explain this? I'm using linux 2.6.19 with xenomai but no xenomai application
is
>running at all. I have a cramfs on a nor flash. What could be the problem?
If I
>kill the process I developed the average load goes down.
>
>Thank you,

>Adi
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