Messages in this thread | | | Date | Mon, 1 Feb 2016 21:34:28 +0100 (CET) | From | Thomas Voegtle <> | Subject | Performance drop on Baytrail with 4.5-rc2 |
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Hi,
I have a Celeron J1900 system (Asrock Q1900B-ITX) always running the latest kernel. Since running the 4.5-rc2 kernel I have a performance drop in a ffmpeg benchmark compared to 4.4. Converting a piece of mpeg to mp4 (to /dev/null).
4.1 made the benchmark in 74s, 4.4 in 75s and now the 4.5-rc2 in 80s.
As the benchmark is very stable in results I easily could bisest it down to the commit:
commit e70eed2b64545ab5c9d2f4d43372d79762f1b985 Author: Philippe Longepe <philippe.longepe@intel.com> Date: Fri Dec 4 17:40:32 2015 +0100
cpufreq: intel_pstate: Account for non C0 time
I can revert this commit on top on 4.5-rc2 (4 of 5 hunks) and then the benchmark is down to 76s.
Was this intended to decrease energy consumption?
Thomas
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