From: Thomas Voegtle <tv@lio96.de>
To: philippe.longepe@intel.com
Cc: linux-kernel@vger.kernel.org, stephane.gasparini@intel.com,
rafael.j.wysocki@intel.com
Subject: Performance drop on Baytrail with 4.5-rc2
Date: Mon, 1 Feb 2016 21:34:28 +0100 (CET) [thread overview]
Message-ID: <alpine.LSU.2.11.1602012122530.9114@er-systems.de> (raw)
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
next reply other threads:[~2016-02-01 20:34 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-01 20:34 Thomas Voegtle [this message]
2016-02-02 10:33 ` Longepe, Philippe
2016-02-02 17:56 ` Thomas Voegtle
[not found] ` <8B729BF8A98FF048A53185F813A469D935B1A189@HASMSX105.ger.corp.intel.com>
2016-02-03 19:18 ` Thomas Voegtle
2016-03-13 15:54 ` Thomas Voegtle
2016-03-15 8:52 ` Longepe, Philippe
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