Excerpts from Gurjeet Singh's message of mié jul 07 00:43:32 -0400 2010:
> If you must know, this instance is on a low-cost, hosted, Xen virtual
> machine.
I think Tom diagnosed an issue affecting pgstats as being out of sync
gettimeofday() results on different processes. IIRC this was on a
virtualized machine of some kind.