This happened because guest used lots of memory on NUMA machine. The KSM might merge similar memory pages of different VMs, sitting on different NUMA memory regions, causing the affected processes to crawl.
Disabled KSM merge_across_nodes: echo 2 > /sys/kernel/mm/ksm/run && sleep 300 && cat /sys/kernel/mm/ksm/pages_shared If there are no pages shared : echo 0 > /sys/kernel/mm/ksm/merge_across_nodes && echo 1 > /sys/kernel/mm/ksm/run make sure to set merge_across_nodes in /etc/sysctl.d to stay across reboots. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/503138 Title: Lucid & Natty, KVM, After kernel message hrtimer: interrupt too slow.... the SMP kvm guest becomes slow. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/503138/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
