Why do I see CPU soft lockups and poor performance on RHEL5 guest?

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Issue

RHEL5 guests on a KVM hypervisor (RHV-H or RHEL) running a 3.10.0-862* kernel results in increasingly poor performance and/or CPU soft lockup messages.

Environment

Red Hat Enterprise Linux 7.5 KVM Hosts / RHV-Hypervisors
- kernel-3.10.0-862*
Red Hat Enterprise Linux 5 (RHEL5) Guests

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