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Linux - Virtualization and Cloud This forum is for the discussion of all topics relating to Linux Virtualization and Linux Cloud platforms. Xen, KVM, OpenVZ, VirtualBox, VMware, Linux-VServer and all other Linux Virtualization platforms are welcome. OpenStack, CloudStack, ownCloud, Cloud Foundry, Eucalyptus, Nimbus, OpenNebula and all other Linux Cloud platforms are welcome. Note that questions relating solely to non-Linux OS's should be asked in the General forum.

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Old 12-07-2012, 10:10 AM   #1
jfsherwoodiii
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Registered: Dec 2012
Location: Scottsville, VA
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Exclamation Slow-running Xen VM on linux host


Hi, all!

I am a newbie to this forum. The guy who was handling all the VM work is no longer with the company, and there was no time for transferring knowledge, and I have a bunch of people complaining about a production VM that is running really slowly.

I am running xm top on the host and it shows all 8 VM domains and Domain-0, which is getting the bulk of the cpu time (but only 28%). Can anyone point me to info about how to diagnose the problem? There are 6 VMs on the host, and they are all showing the blocked state, with only the Domain-0 thread in the running state.

From within the VM, I can find no process getting much CPU at all.

Any help would be greatly appreciated.

Frank
 
Old 12-08-2012, 06:41 AM   #2
tallship
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Location: On the Beaches of Super Sunny Southern San Clemente, California USA
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Exclamation We're going to need a little bit more than that from you...

Quote:
Originally Posted by jfsherwoodiii View Post
Hi, all!

I am a newbie to this forum.
Yes. I see that this is your first post here at LQ. Welcome!

Quote:
The guy who was handling all the VM work is no longer with the company, and there was no time for transferring knowledge
So, what you're saying is, you took the ultimate of shortcuts and you have absolutely zero documentation? Not good.

Quote:
I am running xm top on the host and it shows all 8 VM domains and Domain-0, which is getting the bulk of the cpu time (but only 28%). Can anyone point me to info about how to diagnose the problem? There are 6 VMs on the host, and they are all showing the blocked state, with only the Domain-0 thread in the running state.
It is normal for them to show a blocked state until you throw something at them. Try compiling something huge and intensive... like firefox or something, and then check again. I think you'll see that the particular VM will show as being in a running state at that point.

Quote:
Any help would be greatly appreciated.
Well, it would have really helped a lot had you provided us with the distro/version and some actual output, when this problem started, etc, so all I can really help you with at this point is to direct you to a FAQ of common problems and maybe you can come back after perusing that with something for us to look at:

http://wiki.xen.org/wiki/Xen_Common_...Guest_.2F_DomU

I hope that helps

Kindest regards,

.
 
  


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