On Tue, Dec 22, 2009 at 02:16:49PM +0100, Martin Schmitt wrote: > All, > > I'm running a manually compiled KVM on CentOS 5.4. The KVM installation > has been carried over from CentOS 5.3, when KVM wasn't distributed with > the OS. (I tried to migrate to CentOS 5.4 native KVM support, but wasn't > able to get along with RedHat's interpretation of KVM.) > > The KVM version used is 88, on Kernel 2.6.18-128.7.1.el5, as KVM doesn't > seem to compile on CentOS' current 2.6.18-164.9.1.el5. > > Only on CentOS guests, I see very frequent "soft lockup" messages and > excessively hanging KVM instances. Can you please share some of the soft lockup messages. And how exactly are the VMs hanging? > Long-term stability is fine (several months uptime), but disturbed > by the hangs. The problem already was there on CentOS 5.3 as well. > With the Debian guests on the same host, I have never had any apparent > problems. Questions: - Is there significant swapping on the host? - Are you migrating vm's? > A number of google results suggest that I should work with CPU scaling > on the CentOS guest systems, but unfortunately, CPU scaling is not > available in my guests. So, here's my question: How do I enable CPU > scaling in KVM guests? Or is there any other measure against these soft > lockups that you can recommend? What probably was suggested is to disable cpu frequency scaling on the host. Please provide more details on the host system. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
