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

We're going to need a little bit more than that from you...
 

Yes. I see that this is your first post here at LQ. Welcome!

So, what you're saying is, you took the ultimate of shortcuts and you have absolutely zero documentation? Not good.

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.

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,

.