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Loss of performance on backup power

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http://serverfault.com – I tested my system on backup and saw considerable degradation in performance when running on backup. Here are the results: Config: CPU: 2.0 Ghz, 6 Core, 12 Threads RAM: 16 GB UPS: 600W/ 1000VA PSU: 460W Gold Efficiency OS: Ubuntu 12.04.3 Software: sysbench *) Main Power On andra@Ajax-Alpha:~$ sysbench --test=cpu --cpu-max-prime=100000 --num-threads=12 run sysbench 0.4.12: multi-threaded system evaluation benchmark Running the test with following options: Number of threads: 12 Doing CPU performance benchmark Threads started! Done. Maximum prime number checked in CPU test: 100000 T (HowTos)