Intel Linux Kernel Power Regression

Investigating a potential power issue between Linux 3.15 and 3.16 kernels... Benchmarks by Michael Larabel for a future article on Phoronix.com.

HTML result view exported from: https://openbenchmarking.org/result/1408284-KH-IVBLAPTOP21.

Intel Linux Kernel Power RegressionProcessorMotherboardChipsetMemoryDiskGraphicsAudioNetworkOSKernelDesktopDisplay ServerDisplay DriverOpenGLCompilerFile-SystemScreen ResolutionLinux 3.13Linux 3.14Linux 3.15Linux 3.16Linux 3.17 GitIntel Core i7-3517U @ 3.00GHz (4 Cores)ASUS UX32VDA v1.0Intel 3rd Gen Core DRAM4096MB2 x 128GB SanDisk SD5SF212Intel HD 4000 512MB (1150MHz)Realtek ALC269VBIntel Centrino Advanced-N 6235Ubuntu 14.043.13.0-031300-generic (x86_64)GNOME Shell 3.10.4X Server 1.15.1intel 2.99.9103.3 Mesa 10.1.3GCC 4.8.2ext41920x10803.14.0-031400-generic (x86_64)3.15.0-031500-generic (x86_64)3.16.0-031600-generic (x86_64)3.17.0-999-generic (x86_64)OpenBenchmarking.orgCompiler Details- --build=x86_64-linux-gnu --disable-browser-plugin --disable-libmudflap --disable-werror --enable-checking=release --enable-clocale=gnu --enable-gnu-unique-object --enable-gtk-cairo --enable-java-awt=gtk --enable-java-home --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-multiarch --enable-nls --enable-objc-gc --enable-plugin --enable-shared --enable-threads=posix --host=x86_64-linux-gnu --target=x86_64-linux-gnu --with-abi=m64 --with-arch-32=i686 --with-arch-directory=amd64 --with-multilib-list=m32,m64,mx32 --with-tune=generic -v Processor Details- Scaling Governor: intel_pstate performanceGraphics Details- SNASystem Details- This was running on battery power.

Intel Linux Kernel Power Regressionxonotic: 1920 x 1080 - Highencode-mp3: WAV To MP3Linux 3.13Linux 3.14Linux 3.15Linux 3.16Linux 3.17 Git58.3828.3258.4523.8458.7028.2959.0117.1059.1417.06OpenBenchmarking.org

Xonotic

Resolution: 1920 x 1080 - Effects Quality: High

OpenBenchmarking.orgFrames Per Second, More Is BetterXonotic 0.7Resolution: 1920 x 1080 - Effects Quality: HighLinux 3.13Linux 3.14Linux 3.15Linux 3.16Linux 3.17 Git1326395265SE +/- 0.73, N = 3SE +/- 0.15, N = 3SE +/- 0.11, N = 3SE +/- 0.29, N = 3SE +/- 0.24, N = 358.3858.4558.7059.0159.14MIN: 31 / MAX: 78MIN: 32 / MAX: 77MIN: 32 / MAX: 77MIN: 33 / MAX: 78MIN: 33 / MAX: 78

Xonotic

System Power Consumption Monitor

MinAvgMaxLinux 3.13156363507038546Linux 3.14154063417937399Linux 3.15151033303236667Linux 3.16152733416436674Linux 3.17 Git155543496537939OpenBenchmarking.orgMilliwatts, Fewer Is BetterXonotic 0.7System Power Consumption Monitor10K20K30K40K50K

LAME MP3 Encoding

WAV To MP3

OpenBenchmarking.orgSeconds, Fewer Is BetterLAME MP3 Encoding 3.99.3WAV To MP3Linux 3.13Linux 3.14Linux 3.15Linux 3.16Linux 3.17 Git714212835SE +/- 0.03, N = 5SE +/- 2.76, N = 5SE +/- 0.02, N = 5SE +/- 0.04, N = 5SE +/- 0.01, N = 528.3223.8428.2917.1017.061. (CC) gcc options: -O3 -fomit-frame-pointer -ffast-math -pipe -lm

LAME MP3 Encoding

System Power Consumption Monitor

MinAvgMaxLinux 3.13152291978321578Linux 3.14150442035025263Linux 3.15147181906520779Linux 3.16149852301127972Linux 3.17 Git153692327326122OpenBenchmarking.orgMilliwatts, Fewer Is BetterLAME MP3 Encoding 3.99.3System Power Consumption Monitor7K14K21K28K35K

Timed Idle

System Power Consumption Monitor

MinAvgMaxLinux 3.13146811512816768Linux 3.14144671487816339Linux 3.1560701448916605Linux 3.16144521480816257Linux 3.17 Git146001493015591OpenBenchmarking.orgMilliwatts, Fewer Is BetterTimed IdleSystem Power Consumption Monitor5K10K15K20K25K

System Power Consumption Monitor

Phoronix Test Suite System Monitoring

MinAvgMaxLinux 3.13146812747638546Linux 3.14144672710637399Linux 3.1560702602236667Linux 3.16142592755036674Linux 3.17 Git146002811237939OpenBenchmarking.orgMilliwattsSystem Power Consumption MonitorPhoronix Test Suite System Monitoring10K20K30K40K50K

Phoronix Test Suite v10.8.4