I've seen strange CPU spikes related to the huge number of devices
visible in LPAR mode. You may want to test booting with the cio_ignore=
parameter, to limit to only the devices you need. For more info, see:
http://download.boulder.ibm.com/ibmdl/pub/software/dw/linux390/docu/l26cdd04.pdf
(p. 404, PDF p. 431)
Shot in the dark, but could help.
-Brad
Ron Foster at Baldor-IS wrote:
Hello all,
I have an NFS server that is serving up files to all of our Linux
systems running under z/VM. This is about 40 systems in all. This
system was upgraded to SLES10 Service Pack 2 last weekend.
All has been going well this week until this morning. Our FDR/Upstream
backup of this system did not complete last night. This NFS server runs
in it's own LPAR. When I looked at top, it appeared that between the
backup program and a process called lockd, all CPU was consumed. I
killed the FDR/Upstream backup. It still appears that large amounts of
CPU time are still being used by lockd according to top.
When I do a ps -ef, I see
root 3404 1 54 Nov09 ? 2-07:40:02 [lockd]
Top says the cpu consumption as:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3404 root 16 0 0 0 0 R 98 0.0 3340:55 lockd
When I go into Performance Toolkit and look at LPAR data I see.
Partition Nr. Upid #Proc Weight Wait-C Cap %Load CPU %Busy %Ovhd %Susp
%VMld %Logld Type
BUSNFS 3 12 2 100 NO NO ... 0 57.6 .6
... ... ... IFL
100 NO 1 57.1 .5
... ... ... IFL
So I am pretty sure there is a cpu consumption with this nfs server and
lockd in particular.
Has anyone else run into a problem like this?
Ron Foster
Baldor
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Brad Hinson <[EMAIL PROTECTED]>
Sr. Support Engineer Lead, System z
Red Hat, Inc.
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www.redhat.com/z
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