Why do virtual machines experience latencies of several seconds when KSM (Kernel Same-page Merging) is enabled?

Solution Verified - Updated -

Issue

  • Why do virtual machines experience latencies of several seconds?
  • Why are soft lockups reported in VMs and/or virtualization hosts?

Environment

  • Red Hat Enterprise Linux 6 or 7 as a virtualization host.
  • Red Hat Enterprise Virtualization Hypervisor.
  • KSM (Kernel Same-page Merging) enabled.

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