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0e1f616
(Get the code!)
Rick, I was using a Xen guest with 8 cores and ~15G of memory. Host was a CentOs 5.(6 I believe) with Xen 3.4.3. But I also saw it happen when the same host runs Precise with Xen 4.1.2.
Stephen, now that is very interesting info. So if the kernel commandline would help but not the sysctl, that would narrow things down to the scheduler if any taskgroups exist and at least exclude the creation and destruction of new taskgroups. I should revisit the dump I got with that in mind.