The guest used lots of memory on NUMA machine. Turned out KSM merged some of the processes pages causing the particular processes to crawl.
Disabled KSM merge_across_nodes and it solved the problem: echo 2 > /sys/kernel/mm/ksm/run && sleep 300 && cat /sys/kernel/mm/ksm/pages_shared echo 0 > /sys/kernel/mm/ksm/merge_across_nodes && echo 1 > /sys/kernel/mm/ksm/run -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1346917 Title: Using KSM on NUMA capable machines can cause KVM guest performance and stability issues To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1346917/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
