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Problems with delayed timer interrupts under RHEL6.4 on Xen HVM guests

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http://www.linuxquestions.org – Hi there, We’ve got some strange behaviour with a long-standing set of applications that we’re trying to port across to a new environment – running as a Xen HVM guest. This is displaying intermittent lockups – these manifest by our main application’s built-in watchdogs firing erroneously, detecting “hangs” of several seconds, even though the system is basically idle. We don’t see this problem on other hypervisors, or running bare-metal. After a lot of debugging in our guest kernel and the hypervisor, we’ve discovered that the hangs are due to large gaps where the guest sees no LAP (HowTos)