CPU usage debug in virtual machine

UCS - Univention Corporate Server
,
#1

Hy there,

I’m having issues in a brand new slave install, the 4 of the “park”
This one is installed in old server, HP 380 G5, the server specs are:

  • 2 x Intel® Xeon® CPU E5450 @ 3.00GHz
  • 32GB RAM
    I create a single vm and install ucs 4-4, 4CPUS and 4GB of ram.

I cannot understand but i simple cannot use webgui as always get modules error. The CPU usage is always high with no apparent reason, as a slave server the are a very few users that login to this server.
image
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I have the same settings in mode recent hardware (hp 380 g6) without this… for instance the same graph for a similar VM running in this host
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Any suggestion how to figure out the issue?

#2

Hi,

to me it is completely unclear what you are referring to. first graph shows CPU usage of mostly around 2.5% with some spikes to 10%.
The “top” shows 99,3% idle.
And the third shows an usage below 1%.

So where do you see high CPU usage?

/CV

#3

@christian_voelker thanks for your time.
In the hypervisor the cpu is more than 10% is almost 100% is that what i don’t understand…
ucs dashboard
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Host hypervisor
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Bottom line the vm when i try to use it via webgui e get a lot of errors… like this
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#4

I guess the hypervisor calculates among all available CPUs so you have 8 physical cores and I gues your VM hass a single vCPU, correct? Then the numbers would match.

Regarding CPU usage inside the vm you need to analyze which I would focus on first.

Do vmstat 1 100 or watch top to see which process is using CPU.
The module issue might be related.

/CV

#5

@Christian_Voelker here the vmstat 1 30
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#6

Hi,

Although this is a year old thread, I have the exact same problem with my newly installed Backup DC on a Xen hypervisor. The Master DC load is almost nothing, works great. The Backup DC load is very high with the following processes using most of the CPU’s:
samba
samba-dnsupdate
samba-spnego
univention-mana
univention-user
univention-moun
univention-skel

This is the load of the Backup DC. As you can see it goes up and down like that all the time:
image

This is the load of the Master DC. As you can see, no problems.
image

Any help pointing me in a direction would be very much appreciated.

Thanks and stay safe in good health.

Laurent

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