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This BZ is a clone of bug 1552696 . Bug 1552696 is a very
old BZ and I think I was a little confused when I opened it.

timer_migration has always been disabled in the realtime
profiles and that's the right thing to do because enabling
timer migration will cause timers to be migrated to busy CPUs.
Which in turn are CPUs running DPDK threads (see bug 1797629).