Comment 2 for bug 1264346

Running frequency_governors_test sheds some light on this bug because it exposes this error:

ERROR On demand performance vs maximum of 380.0% is not within 10.0% margin

# /usr/lib/checkbox/bin/frequency_governors_test
2013-12-26 18:15:54 INFO System Capabilites:
2013-12-26 18:15:54 INFO -------------------------------------------------
2013-12-26 18:15:54 INFO System has 4 cpus
2013-12-26 18:15:54 INFO Supported CPU Frequencies:
2013-12-26 18:15:54 INFO 2801 MHz
2013-12-26 18:15:54 INFO 2800 MHz
2013-12-26 18:15:54 INFO 2600 MHz
2013-12-26 18:15:54 INFO 2400 MHz
2013-12-26 18:15:54 INFO 2200 MHz
2013-12-26 18:15:54 INFO 2000 MHz
2013-12-26 18:15:54 INFO 1800 MHz
2013-12-26 18:15:54 INFO 1600 MHz
2013-12-26 18:15:54 INFO 1400 MHz
2013-12-26 18:15:54 INFO 1200 MHz
2013-12-26 18:15:54 INFO 1000 MHz
2013-12-26 18:15:54 INFO 800 MHz
2013-12-26 18:15:54 INFO Supported Governors:
2013-12-26 18:15:54 INFO conservative
2013-12-26 18:15:54 INFO ondemand
2013-12-26 18:15:54 INFO userspace
2013-12-26 18:15:54 INFO powersave
2013-12-26 18:15:54 INFO performance
2013-12-26 18:15:54 INFO Current governors:
2013-12-26 18:15:54 INFO cpu0: conservative
2013-12-26 18:15:54 INFO cpu1: conservative
2013-12-26 18:15:54 INFO cpu2: conservative
2013-12-26 18:15:54 INFO cpu3: conservative
2013-12-26 18:15:54 INFO Beginning Frequency Governors Testing
2013-12-26 18:15:54 INFO Userspace Governor Test:
2013-12-26 18:15:54 INFO -------------------------------------------------
2013-12-26 18:15:54 INFO Setting governor to userspace
2013-12-26 18:16:25 INFO Setting CPU frequency to 800 MHz
2013-12-26 18:16:25 INFO Running CPU load test...
2013-12-26 18:16:25 INFO pid 4613's current affinity list: 0-3
2013-12-26 18:16:25 INFO pid 4613's new affinity list: 0
2013-12-26 18:16:25 INFO Minimum frequency load test time: 0.23
2013-12-26 18:16:25 INFO Setting CPU frequency to 2801 MHz
2013-12-26 18:16:25 INFO Running CPU load test...
2013-12-26 18:16:25 INFO pid 4613's current affinity list: 0
2013-12-26 18:16:25 INFO pid 4613's new affinity list: 0
2013-12-26 18:16:25 INFO Maximum frequency load test time: 0.05
2013-12-26 18:16:25 INFO Found ida flag, increasing expected speedup by 8.0%
2013-12-26 18:16:25 INFO CPU Frequency Speed Up: 3.81
2013-12-26 18:16:25 INFO Measured Speed Up: 4.60
2013-12-26 18:16:25 INFO Percentage Difference 20.9%
2013-12-26 18:16:25 ERROR Measured speedup vs expected speedup is 20.9% and is not within 10.0% margin.
2013-12-26 18:16:25 INFO On Demand Governor Test:
2013-12-26 18:16:25 INFO -------------------------------------------------
2013-12-26 18:16:25 INFO Setting governor to ondemand
2013-12-26 18:16:25 INFO Waiting 5 seconds...
2013-12-26 18:16:30 INFO Done.
2013-12-26 18:16:30 INFO Running CPU load test...
2013-12-26 18:16:30 INFO pid 4613's current affinity list: 0
2013-12-26 18:16:30 INFO pid 4613's new affinity list: 0
2013-12-26 18:16:31 INFO On Demand load test time: 0.24
2013-12-26 18:16:31 INFO Percentage Difference vs. maximum frequency: 380.0%
2013-12-26 18:16:31 ERROR On demand performance vs maximum of 380.0% is not within 10.0% margin
2013-12-26 18:16:31 INFO Waiting 5 seconds...
2013-12-26 18:16:36 INFO Done.
2013-12-26 18:16:36 INFO Performance Governor Test:
2013-12-26 18:16:36 INFO -------------------------------------------------
2013-12-26 18:16:36 INFO Setting governor to performance
2013-12-26 18:16:36 INFO Running CPU load test...
2013-12-26 18:16:36 INFO pid 4613's current affinity list: 0
2013-12-26 18:16:36 INFO pid 4613's new affinity list: 0
2013-12-26 18:16:36 INFO Performance load test time: 0.05
2013-12-26 18:16:36 INFO Percentage Difference vs. maximum frequency: 0.0%
2013-12-26 18:16:36 INFO Conservative Governor Test:
2013-12-26 18:16:36 INFO -------------------------------------------------
2013-12-26 18:16:36 INFO Setting governor to conservative
2013-12-26 18:16:36 INFO Waiting 10 seconds...
2013-12-26 18:16:46 INFO Done.
2013-12-26 18:16:46 INFO Running CPU load test...
2013-12-26 18:16:46 INFO pid 4613's current affinity list: 0
2013-12-26 18:16:46 INFO pid 4613's new affinity list: 0
2013-12-26 18:16:47 ERROR Could not repeat load test times within 5.0%
2013-12-26 18:16:47 ERROR No Conservative load test time available.
2013-12-26 18:16:47 ERROR Not enough timing data to calculate speed differences.
2013-12-26 18:16:47 INFO Restoring original governor to conservative