On Thu, Apr 18, 2013 at 12:00 PM, Martin Wawro <martin.wawro@xxxxxxxxx> wrote: > On 04/18/2013 09:25 AM, Stefan Hajnoczi wrote: >> I see. That's a good reason to carefully monitor the host for things >> that could interfere with guest performance. >> >> Stefan > Seems that today is a bad day for our server. We had to give him the > boot (again). > Also the results of the pidstat output do not seem to yield much > additional information > on what could be the problem. > > In order to avoid spilling this mailing list, here is some data gathered > on the host: > http://pastebin.com/8q7UgXkJ > > ...and this is the data from the guest: > http://pastebin.com/xLTYZjGp No answer but some more questions. Regarding the kvm_stat output, the exits are caused by 68,000 pagefaults/second (pf_fixed). Perhaps someone can explain what this means? The host has 8 cores, the guest has 7. Host pidstat shows qemu-kvm consuming 263.9% CPU: 11:25:27 4017 11.13 34.65 218.12 263.90 7 qemu-kvm Why is the guest not getting more than 3 CPUs since the host is otherwise idle? You may want to disable ksmd on the host since you only have 1 guest, but I doubt that will fix the main problem: 11:25:27 100 0.00 7.89 0.00 7.89 7 ksmd For details, see https://www.kernel.org/doc/Documentation/vm/ksm.txt. What is the python process on the host doing? Is it poking libvirt? 11:25:27 4558 4.66 3.55 0.00 8.21 7 python 11:25:27 3659 3.99 4.55 0.00 8.54 7 libvirtd Stefan -- 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
