Hello, On Wednesday 04 September 2013 09:43:55 Maciej Gałkiewicz wrote: > I am experiencing very weird and hard to debug issue for me with live > migration. After successfully migrating VM it is not usable. It > responds to echo requests (for some time). When I am trying to 'ping' > someone only the first packet appears on network interface (I am able > to receive one echo response). Command 'sleep' hangs forever, htop > shows black screen. In the past I had a similar problem with buggy KVM/xen, when the CPU time stamp counters (TSC) were not synchronized between different host (this is not expected): For the VM the TSC jumped forward/backward and the kernel decided to wait in a busy-loop until the TSC was right again. Migrating the VM back often solved the problem temporary, as the problem only occurred when migrating from A to B, but not from B to A. You might check that as well. > The problem appears randomly. I never noticed the problem, when I started my servers at the same time. I only noticed it, when I booted the servers with (several) minutes in between, so it looked random to me at first too. > I have already tried kvm 1.6.0 and > 1.5.0. Kernel on host and guest is 3.10.5 (tried 3.10.7 as well). All > VMs are running and live migrating through libvirt 1.1.2 (tried > previous versions as well). Guest and host OS is Debian jessie/sid. That looks new enough, so this might me a complete different problem. So just for reference here's the link to our German Bugzilla entry, were you can find my past findings: <https://forge.univention.org/bugzilla/show_bug.cgi?id=23258#c6> Sincerely Philipp -- Philipp Hahn Open Source Software Engineer hahn@xxxxxxxxxxxxx Univention GmbH be open. fon: +49 421 22 232- 0 Mary-Somerville-Str.1 D-28359 Bremen fax: +49 421 22 232-99 http://www.univention.de/ Director:Peter H. Ganten HRB 20755 Amtsgericht Bremen UID:DE 220 051 310 -- 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
