[Bug 503138] Re: Lucid & Natty, KVM, After kernel message hrtimer: interrupt too slow.... the SMP kvm guest becomes slow.
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
