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tuned 2.11.0-9 and later writes to kerned.sched_wakeup_granularity_ns and other sysctl tunables that we so laboriously tuned, dropping performance by a factor of 5 (due to increased latency). Fix by obsoleting tuned during install (in effect, we are a better tuned, at least for us). Not needed for .deb, since debian/ubunto do not install tuned by default. Fixes #7696 Closes #7776