Intel CPU Broadwell Core i7 Ultrabook Scaling ACPI CPUFreq vs. Intel P-State CPU frequency scaling drivers on Ubuntu 15.04. Tests by Michael Larabel for a future article on Phoronix.com. P-State Powersave: Processor: Intel Core i7-5600U @ 3.20GHz (4 Cores), Motherboard: LENOVO 20BSCTO1WW, Chipset: Intel Broadwell-U-OPI, Memory: 8192MB, Disk: 128GB SAMSUNG MZNTE128, Graphics: Intel Broadwell-U (950MHz), Audio: Intel Broadwell-U Audio, Network: Intel Connection + Intel Wireless 7265 OS: Ubuntu 15.04, Kernel: 3.18.0-9-generic (x86_64), Desktop: Unity 7.3.1, Display Server: X Server 1.16.2.901 (1.16.3 RC 1), Display Driver: intel 2.99.917, OpenGL: 3.3 Mesa 10.3.2, Compiler: GCC 4.9.2, File-System: ext4, Screen Resolution: 1920x1080 P-State Performance: Processor: Intel Core i7-5600U @ 3.20GHz (4 Cores), Motherboard: LENOVO 20BSCTO1WW, Chipset: Intel Broadwell-U-OPI, Memory: 8192MB, Disk: 128GB SAMSUNG MZNTE128, Graphics: Intel Broadwell-U (950MHz), Audio: Intel Broadwell-U Audio, Network: Intel Connection + Intel Wireless 7265 OS: Ubuntu 15.04, Kernel: 3.18.0-9-generic (x86_64), Desktop: Unity 7.3.1, Display Server: X Server 1.16.2.901 (1.16.3 RC 1), Display Driver: intel 2.99.917, OpenGL: 3.3 Mesa 10.3.2, Compiler: GCC 4.9.2, File-System: ext4, Screen Resolution: 1920x1080 CPUFreq Performance: Processor: Intel Core i7-5600U @ 2.60GHz (4 Cores), Motherboard: LENOVO 20BSCTO1WW, Chipset: Intel Broadwell-U-OPI, Memory: 8192MB, Disk: 128GB SAMSUNG MZNTE128, Graphics: Intel Broadwell-U (950MHz), Audio: Intel Broadwell-U Audio, Network: Intel Connection + Intel Wireless 7265 OS: Ubuntu 15.04, Kernel: 3.18.0-9-generic (x86_64), Desktop: Unity 7.3.1, Display Server: X Server 1.16.2.901 (1.16.3 RC 1), Display Driver: intel 2.99.917, OpenGL: 3.3 Mesa 10.3.2, Compiler: GCC 4.9.2, File-System: ext4, Screen Resolution: 1920x1080 CPUFreq Ondemand: Processor: Intel Core i7-5600U @ 2.60GHz (4 Cores), Motherboard: LENOVO 20BSCTO1WW, Chipset: Intel Broadwell-U-OPI, Memory: 8192MB, Disk: 128GB SAMSUNG MZNTE128, Graphics: Intel Broadwell-U (950MHz), Audio: Intel Broadwell-U Audio, Network: Intel Connection + Intel Wireless 7265 OS: Ubuntu 15.04, Kernel: 3.18.0-9-generic (x86_64), Desktop: Unity 7.3.1, Display Server: X Server 1.16.2.901 (1.16.3 RC 1), Display Driver: intel 2.99.917, OpenGL: 3.3 Mesa 10.3.2, Compiler: GCC 4.9.2, File-System: ext4, Screen Resolution: 1920x1080 FFmpeg 2.1.1 H.264 HD To NTSC DV Seconds < Lower Is Better P-State Powersave ... 18.28 |============================================== P-State Performance . 18.26 |============================================== CPUFreq Performance . 19.77 |================================================== CPUFreq Ondemand .... 19.84 |================================================== FFTW 3.3.4 Build: Stock - Size: 2D FFT Size 32 Mflops > Higher Is Better P-State Powersave ... 6756.12 |================================================ P-State Performance . 6780.00 |================================================ CPUFreq Performance . 6732.96 |================================================ CPUFreq Ondemand .... 6739.22 |================================================ FFTW 3.3.4 Build: Stock - Size: 2D FFT Size 2048 Mflops > Higher Is Better P-State Powersave ... 3895.68 |================================================ P-State Performance . 3911.08 |================================================ CPUFreq Performance . 3911.96 |================================================ CPUFreq Ondemand .... 3888.84 |================================================ LAME MP3 Encoding 3.99.3 WAV To MP3 Seconds < Lower Is Better P-State Powersave ... 12.89 |================================================== P-State Performance . 12.87 |================================================== CPUFreq Performance . 12.87 |================================================== CPUFreq Ondemand .... 12.82 |================================================== OpenArena 0.8.8 Resolution: 1920 x 1080 Frames Per Second > Higher Is Better P-State Powersave ... 37.27 |================================================== P-State Performance . 37.37 |================================================== CPUFreq Performance . 37.17 |================================================== CPUFreq Ondemand .... 37.40 |================================================== OpenArena 0.8.8 Resolution: 1920 x 1080 - Total Frame Time Milliseconds < Lower Is Better P-State Powersave ... MIN: 4.0 AVG: 26.9 MAX: 59.0 P-State Performance . MIN: 4.0 AVG: 26.6 MAX: 57.0 CPUFreq Performance . MIN: 4.0 AVG: 26.7 MAX: 58.0 CPUFreq Ondemand .... MIN: 4.0 AVG: 26.6 MAX: 58.0 Timed Linux Kernel Compilation 3.18-rc6 Time To Compile Seconds < Lower Is Better P-State Powersave ... 283.56 |================================================= P-State Performance . 281.84 |================================================= CPUFreq Performance . 280.21 |================================================ CPUFreq Ondemand .... 282.75 |================================================= x264 2014-08-30 H.264 Video Encoding Frames Per Second > Higher Is Better P-State Powersave ... 73.57 |================================================== P-State Performance . 73.42 |================================================== CPUFreq Performance . 73.11 |================================================== CPUFreq Ondemand .... 73.19 |================================================== Xonotic 0.8 Resolution: 1920 x 1080 - Effects Quality: Low Frames Per Second > Higher Is Better P-State Powersave ... 166.86 |================================================= P-State Performance . 165.49 |================================================ CPUFreq Performance . 167.66 |================================================= CPUFreq Ondemand .... 166.64 |================================================= Xonotic 0.8 Resolution: 1920 x 1080 - Effects Quality: Ultra Frames Per Second > Higher Is Better P-State Powersave ... 55.70 |================================================== P-State Performance . 55.61 |================================================== CPUFreq Performance . 55.96 |================================================== CPUFreq Ondemand .... 55.90 |==================================================