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LAS16-307: Benchmarking Schedutil in Android

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Linaro
Linaro

This document summarizes benchmarking results that compare the performance and power efficiency of Android's schedutil CPU scheduler against the existing ondemand and interactive schedulers. Tests were conducted on a Hikey development board using various workloads before and after applying the Energy Aware Scheduling patches. While schedutil showed competitive performance in many tests, some regressions were observed in user experience metrics like recent app switching and gallery scrolling, as well as higher energy usage when combined with the EAS patches, indicating areas for further optimization.

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LAS16-307 Benchmarking Schedutil in Android Steve Muckle
ENGINEERS AND DEVICES WORKING TOGETHER Overview ● Creating an Android Perf/Power Suite ● Schedutil Comparison Results
ENGINEERS AND DEVICES WORKING TOGETHER Overview ● Creating an Android Perf/Power Suite ● Schedutil Comparison Results
ENGINEERS AND DEVICES WORKING TOGETHER Why is Android Important to Test? ● Maintainers want real world impact ○ Unit tests/synthetic workloads do not always guarantee this ● By far the dominant mobile OS ○ 66% in US, ~75% in top five EU markets, 77% in China http://venturebeat.com/2016/05/11/android-is-eating-apples-ios-market-share-everywhere/ ○ 1.4 Billion active devices as of Sept 2015 http://www.androidcentral.com/google-says-there-are-now-14-billion-active-android-devices-w orldwide ● Importance of perf/power dynamic in this space
ENGINEERS AND DEVICES WORKING TOGETHER How is Android Usually Profiled? ● Custom internal-only platforms ● Expensive test equipment ● Commercial-quality software stack ○ Mature drivers, userspace ○ Tuned for product level power and performance ● Carefully chosen benchmarks ○ Relevant workloads ○ Industry acceptance
ENGINEERS AND DEVICES WORKING TOGETHER Advantages of Commercial Entities ● Manpower ● $$$ ● Access to internal-only platforms ● Connections ○ to bloggers ○ to authors of benchmarks ■ Note: access to source, ability to influence benchmark (!) ○ to chip vendors/handset vendors ○ to Google
ENGINEERS AND DEVICES WORKING TOGETHER Hikey vs. Internal Platform ● Access to platform ○ hikey: full community access to hardware, firmware, schematics and sources ○ typical: no access ● software stack ○ hikey: untuned community-supported ○ typical: product quality ● power domain accessibility ○ hikey: total SOC power ○ typical: CPU power (individual rails) ● measurement tools ○ hikey: do-it-yourself w/sense resistor ○ typical: professionally calibrated/supported test equipment, thermal chambers
ENGINEERS AND DEVICES WORKING TOGETHER Creating a Test Suite ● Three areas: ○ Performance ○ Ux ○ Power
ENGINEERS AND DEVICES WORKING TOGETHER Performance ● Composite system benchmark ○ harder to analyze ○ someone’s perception of the right mixture of tests ○ Licensing :( ○ AnTuTu to start ■ 3D, UX, CPU, RAM ● TODO: I/O, gaming benchmarks
ENGINEERS AND DEVICES WORKING TOGETHER Ux - What is a Jank? ● UI ideally runs at 60fps Why 60fps: https://www.youtube.com/watch?v=CaMTIgxCSqU ● Dropped/delayed frames = Jank ● Something took too long
ENGINEERS AND DEVICES WORKING TOGETHER Ux ● Recentfling test ○ Part of Android Tree ○ Measures flinging back and forth across recent apps ● New tests based on recentfling ○ Email fling ○ Browser fling ○ Gallery fling
ENGINEERS AND DEVICES WORKING TOGETHER Power ● Idle home screen ● Mp3 playback ● Mpeg4 video playback ● Todo: ○ Email browsing ○ Web browsing
ENGINEERS AND DEVICES WORKING TOGETHER Automation ● Reduce tedium ● Help with repeatability ○ Fixed duration power measurements (energy) ○ Capture the same background activity (hopefully) ○ Precise touches and flings
ENGINEERS AND DEVICES WORKING TOGETHER Workload Automation Suite ● Apache v2.0 licensed ● Created by ARM ● Written in python ● Supports many popular workloads out of the box* ● Very modular ● http://workload-automation.readthedocs.io/en/latest/ ● https://git.linaro.org/people/steve.muckle/wa.git
ENGINEERS AND DEVICES WORKING TOGETHER Workload Support ● WA support often lags app updates ● New app version = ? ● Few changes to support non-gapps Android env
ENGINEERS AND DEVICES WORKING TOGETHER Challenges in Testing Power ● Be careful reworking your dev boards
ENGINEERS AND DEVICES WORKING TOGETHER Challenges in Testing Power ● Random background activity ● Temperature ● Tolerance in shunt resistor ● Aliasing ● Great presentation on all this by Andy Green at http://www.slideshare.net/linaroorg/how-to-measuresocpower
ENGINEERS AND DEVICES WORKING TOGETHER Issues ● Target stability ○ MAILBOX_QUEUE_LEN on Hikey ● Framework stability ○ intermittent failures (“adb returned early” and others) ● Test stability ○ Antutu failing to start ○ Inconsistent flings
ENGINEERS AND DEVICES WORKING TOGETHER Overview ● Creating an Android Perf/Power Suite ● Schedutil Comparison Results
ENGINEERS AND DEVICES WORKING TOGETHER Two Test Builds ● EAS not upstream yet ● Comparisons with/without EAS
ENGINEERS AND DEVICES WORKING TOGETHER Test Build 1 ● Android 4.4 hikey kernel pre-EAS ● Cpufreq tip from Rafael Wysocki’s bleeding-edge branch ● Schedutil patch to use rt-avg for RT instead of fmax ● OPP dependencies ● Fixes to interactive gov for tip cpufreq ● AOSP master as August 22
ENGINEERS AND DEVICES WORKING TOGETHER Tuning ● Interactive above_hispeed_delay: 20000 boostpulse_duration: 1000000 go_hispeed_load: 99 hispeed_freq: 1200000 io_is_busy: 1 min_sample_time: 80000 target_loads: 65 729000:75 960000:85 timer_rate: 20000 timer_slack: 20000
ENGINEERS AND DEVICES WORKING TOGETHER Tuning ● Ondemand ignore_nice_load: 0 io_is_busy: 0 min_sampling_rate: 10000 powersave_bias: 0 sampling_down_factor: 1 sampling_rate: 20000 up_threshold: 95
ENGINEERS AND DEVICES WORKING TOGETHER Tuning ● schedutil rate_limit_us: 20000
ENGINEERS AND DEVICES WORKING TOGETHER AnTuTu Total (higher is better) trial 1 trial 2 trial 3 avg stddev ondemand 31328 31478 31026 31277 230 interactive 31796 30724 30405 30975 728 schedutil 30874 30512 30526 30637 205 Respectable result for schedutil.
ENGINEERS AND DEVICES WORKING TOGETHER recentfling (lower is better) % janky frames trial 1 trial 2 trial 3 avg stddev ondemand 18% 19% 18% 18.3% 0.57 interactive 11% 17% 14% 14% 3 schedutil 33% 45% 43% 40.3% 6.4 Nasty regression for schedutil. Needs further investigation. PELT? WALT?
ENGINEERS AND DEVICES WORKING TOGETHER emailfling (lower is better) % janky frames trial 1 trial 2 trial 3 avg stddev ondemand 1% 0% 0% 0.33% 0.57 interactive 4% 3% 2% 3% 1 schedutil 0% 0% 1% 0.33% 0.57 Results in the noise.
ENGINEERS AND DEVICES WORKING TOGETHER browserfling (lower is better) pct janky frames trial 1 trial 2 trial 3 avg stddev ondemand 0% 0% 0% 0% 0 interactive 8% 8% 7% 7.66% 0.57 schedutil 0% 0% 0% 0% 0 Good result for schedutil here...
ENGINEERS AND DEVICES WORKING TOGETHER galleryfling (lower is better) % janky frames trial 1 trial 2 trial 3 avg stddev ondemand 0% 0% 0% 0% 0 interactive 1% 1% 1% 1% 0 schedutil 1% 1% 1% 1% 0 Results in noise.
ENGINEERS AND DEVICES WORKING TOGETHER Idle home screen energy (lower is better) J trial 1 trial 2 trial 3 avg stddev ondemand 12.6 12.935 12.955 12.83 0.20 interactive 13.734 13.717 13.71 13.72 0.01 schedutil 14.017 13.875 13.893 13.93 0.07 Schedutil is competitive.
ENGINEERS AND DEVICES WORKING TOGETHER Mp3 playback energy (lower is better) J trial 1 trial 2 trial 3 avg stddev ondemand 22.888 23.127 23.004 23.01 0.12 interactive 23.871 23.928 23.467 23.76 0.25 schedutil 23.953 23.866 23.746 23.86 0.10 Schedutil is competitive.
ENGINEERS AND DEVICES WORKING TOGETHER 720p mpeg4 playback energy (lower is better) J trial 1 trial 2 trial 3 avg stddev ondemand 20.375 20.485 20.739 20.53 0.18 interactive 19.505 20.095 19.331 19.64 0.40 schedutil 21.103 20.879 20.766 20.92 0.17 Schedutil is competitive.
ENGINEERS AND DEVICES WORKING TOGETHER Test Build 2 ● Android 4.4 hikey kernel + EAS 5.2 - schedfreq/schedtune + schedutil/cpufreq from test build 1 ○ Thanks to Juri Lelli for providing this branch ● AOSP master as August 22
ENGINEERS AND DEVICES WORKING TOGETHER Tuning ● Interactive above_hispeed_delay: 20000 boostpulse_duration: 80000 go_hispeed_load: 99 hispeed_freq: 1200000 io_is_busy: 0 min_sample_time: 80000 target_loads: 90 timer_rate: 20000 timer_slack: 80000
ENGINEERS AND DEVICES WORKING TOGETHER Tuning ● Ondemand ignore_nice_load: 0 io_is_busy: 0 min_sampling_rate: 10000 powersave_bias: 0 sampling_down_factor: 1 sampling_rate: 20000 up_threshold: 95
ENGINEERS AND DEVICES WORKING TOGETHER Tuning ● schedutil rate_limit_us: 20000
ENGINEERS AND DEVICES WORKING TOGETHER AnTuTu Total (higher is better) trial 1 trial 2 trial 3 avg stddev ondemand 29959 30066 30108 30044 77 interactive 31050 31083 30863 30998 118 schedutil 29606 29279 28942 29275 332 schedutil-w 30364 30607 30447 30472 123 perf 31688 31413 31548 31549 137 WALT clearly helps schedutil on AnTuTu.
ENGINEERS AND DEVICES WORKING TOGETHER recentfling (lower is better) % janky frames trial 1 trial 2 trial 3 avg stddev ondemand 30% 30% 31% 30.3% 0.57 interactive 18% 17% 21% 18.6% 2.08 schedutil 39% 44% 42% 41.6% 2.5 schedutil-w 22% 32% 36% 30% 7.2 perf 23% 16% 14% 17.6% 4.7 WALT also helps with recentfling regression (not completely though).
ENGINEERS AND DEVICES WORKING TOGETHER emailfling (lower is better) % janky frames trial 1 trial 2 trial 3 avg stddev ondemand 0% 0% 0% 0% 0 interactive 0% 1% 1% 0.66% 0.57 schedutil 5% 4% 5% 4.67% 0.57 schedutil-w 6% 6% 4% 5.33% 1.15 perf 0% 0% 0% 0% 0 Respectable result for schedutil.
ENGINEERS AND DEVICES WORKING TOGETHER browserfling (lower is better) pct janky frames trial 1 trial 2 trial 3 avg stddev ondemand 0% 0% 0% 0% 0 interactive 2% 1% 1% 1.3% 0.57 schedutil 9% 7% 5% 7% 2 schedutil-w 3% 4% 8% 5% 2.64 perf 0% 0% 0% 0% 0 Possible small regression in browserfling.
ENGINEERS AND DEVICES WORKING TOGETHER galleryfling (lower is better) % janky frames trial 1 trial 2 trial 3 avg stddev ondemand 0% 0% 1% 0.33% 0.57 interactive 1% 1% 2% 1.33% 0.57 schedutil 20% 21% 27% 22.66% 3.79 schedutil-w 5% 6% 6% 5.66% 0.57 perf 4% 4% 4% 4% 0 Regression with schedutil.
ENGINEERS AND DEVICES WORKING TOGETHER Idle home screen energy (lower is better) J trial 1 trial 2 trial 3 avg stddev ondemand 11.704 11.761 11.730 11.73 0.03 interactive 10.685 10.753 10.844 10.76 0.08 schedutil 10.47 11.554 10.613 10.87 0.59 schedutil-w 12.146 12.144 12.127 12.14 0.01 perf 12.999 13.187 12.822 13.00 0.18 Energy regression with WALT.
ENGINEERS AND DEVICES WORKING TOGETHER Mp3 playback energy (lower is better) J trial 1 trial 2 trial 3 avg stddev ondemand 20.044 20.992 21.178 20.74 0.61 interactive 21.699 21.933 21.667 21.76 0.15 schedutil 18.458 18.446 18.471 18.46 0.01 schedutil-w 22.87 22.914 22.995 22.93 0.01 perf 22.539 23.445 22.869 22.951 0.46 Energy regression with WALT.
ENGINEERS AND DEVICES WORKING TOGETHER 720p mpeg4 playback energy (lower is better) J trial 1 trial 2 trial 3 avg stddev ondemand 19.932 19.443 19.578 19.651 0.25 interactive 19.34 19.408 19.295 19.347 0.06 schedutil 17.48 17.508 17.485 17.491 0.01 schedutil-w 21.313 21.028 21.218 21.186 0.15 perf 21.574 20.979 21.263 21.272 0.30 Energy regression with WALT.
ENGINEERS AND DEVICES WORKING TOGETHER Next Steps ● test framework ○ repeatability ○ WA stability ● deeper result analysis ○ recentfling regression ○ possible galleryfling regression ○ energy regression with WALT ● incorporate schedtune
Thank You #LAS16 For further information: www.linaro.org LAS16 keynotes and videos on: connect.linaro.org

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LAS16-307: Benchmarking Schedutil in Android

  • 1. LAS16-307 Benchmarking Schedutil in Android Steve Muckle
  • 2. ENGINEERS AND DEVICES WORKING TOGETHER Overview ● Creating an Android Perf/Power Suite ● Schedutil Comparison Results
  • 3. ENGINEERS AND DEVICES WORKING TOGETHER Overview ● Creating an Android Perf/Power Suite ● Schedutil Comparison Results
  • 4. ENGINEERS AND DEVICES WORKING TOGETHER Why is Android Important to Test? ● Maintainers want real world impact ○ Unit tests/synthetic workloads do not always guarantee this ● By far the dominant mobile OS ○ 66% in US, ~75% in top five EU markets, 77% in China http://venturebeat.com/2016/05/11/android-is-eating-apples-ios-market-share-everywhere/ ○ 1.4 Billion active devices as of Sept 2015 http://www.androidcentral.com/google-says-there-are-now-14-billion-active-android-devices-w orldwide ● Importance of perf/power dynamic in this space
  • 5. ENGINEERS AND DEVICES WORKING TOGETHER How is Android Usually Profiled? ● Custom internal-only platforms ● Expensive test equipment ● Commercial-quality software stack ○ Mature drivers, userspace ○ Tuned for product level power and performance ● Carefully chosen benchmarks ○ Relevant workloads ○ Industry acceptance
  • 6. ENGINEERS AND DEVICES WORKING TOGETHER Advantages of Commercial Entities ● Manpower ● $$$ ● Access to internal-only platforms ● Connections ○ to bloggers ○ to authors of benchmarks ■ Note: access to source, ability to influence benchmark (!) ○ to chip vendors/handset vendors ○ to Google
  • 7. ENGINEERS AND DEVICES WORKING TOGETHER Hikey vs. Internal Platform ● Access to platform ○ hikey: full community access to hardware, firmware, schematics and sources ○ typical: no access ● software stack ○ hikey: untuned community-supported ○ typical: product quality ● power domain accessibility ○ hikey: total SOC power ○ typical: CPU power (individual rails) ● measurement tools ○ hikey: do-it-yourself w/sense resistor ○ typical: professionally calibrated/supported test equipment, thermal chambers
  • 8. ENGINEERS AND DEVICES WORKING TOGETHER Creating a Test Suite ● Three areas: ○ Performance ○ Ux ○ Power
  • 9. ENGINEERS AND DEVICES WORKING TOGETHER Performance ● Composite system benchmark ○ harder to analyze ○ someone’s perception of the right mixture of tests ○ Licensing :( ○ AnTuTu to start ■ 3D, UX, CPU, RAM ● TODO: I/O, gaming benchmarks
  • 10. ENGINEERS AND DEVICES WORKING TOGETHER Ux - What is a Jank? ● UI ideally runs at 60fps Why 60fps: https://www.youtube.com/watch?v=CaMTIgxCSqU ● Dropped/delayed frames = Jank ● Something took too long
  • 11. ENGINEERS AND DEVICES WORKING TOGETHER Ux ● Recentfling test ○ Part of Android Tree ○ Measures flinging back and forth across recent apps ● New tests based on recentfling ○ Email fling ○ Browser fling ○ Gallery fling
  • 12. ENGINEERS AND DEVICES WORKING TOGETHER Power ● Idle home screen ● Mp3 playback ● Mpeg4 video playback ● Todo: ○ Email browsing ○ Web browsing
  • 13. ENGINEERS AND DEVICES WORKING TOGETHER Automation ● Reduce tedium ● Help with repeatability ○ Fixed duration power measurements (energy) ○ Capture the same background activity (hopefully) ○ Precise touches and flings
  • 14. ENGINEERS AND DEVICES WORKING TOGETHER Workload Automation Suite ● Apache v2.0 licensed ● Created by ARM ● Written in python ● Supports many popular workloads out of the box* ● Very modular ● http://workload-automation.readthedocs.io/en/latest/ ● https://git.linaro.org/people/steve.muckle/wa.git
  • 15. ENGINEERS AND DEVICES WORKING TOGETHER Workload Support ● WA support often lags app updates ● New app version = ? ● Few changes to support non-gapps Android env
  • 16. ENGINEERS AND DEVICES WORKING TOGETHER Challenges in Testing Power ● Be careful reworking your dev boards
  • 17. ENGINEERS AND DEVICES WORKING TOGETHER Challenges in Testing Power ● Random background activity ● Temperature ● Tolerance in shunt resistor ● Aliasing ● Great presentation on all this by Andy Green at http://www.slideshare.net/linaroorg/how-to-measuresocpower
  • 18. ENGINEERS AND DEVICES WORKING TOGETHER Issues ● Target stability ○ MAILBOX_QUEUE_LEN on Hikey ● Framework stability ○ intermittent failures (“adb returned early” and others) ● Test stability ○ Antutu failing to start ○ Inconsistent flings
  • 19. ENGINEERS AND DEVICES WORKING TOGETHER Overview ● Creating an Android Perf/Power Suite ● Schedutil Comparison Results
  • 20. ENGINEERS AND DEVICES WORKING TOGETHER Two Test Builds ● EAS not upstream yet ● Comparisons with/without EAS
  • 21. ENGINEERS AND DEVICES WORKING TOGETHER Test Build 1 ● Android 4.4 hikey kernel pre-EAS ● Cpufreq tip from Rafael Wysocki’s bleeding-edge branch ● Schedutil patch to use rt-avg for RT instead of fmax ● OPP dependencies ● Fixes to interactive gov for tip cpufreq ● AOSP master as August 22
  • 22. ENGINEERS AND DEVICES WORKING TOGETHER Tuning ● Interactive above_hispeed_delay: 20000 boostpulse_duration: 1000000 go_hispeed_load: 99 hispeed_freq: 1200000 io_is_busy: 1 min_sample_time: 80000 target_loads: 65 729000:75 960000:85 timer_rate: 20000 timer_slack: 20000
  • 23. ENGINEERS AND DEVICES WORKING TOGETHER Tuning ● Ondemand ignore_nice_load: 0 io_is_busy: 0 min_sampling_rate: 10000 powersave_bias: 0 sampling_down_factor: 1 sampling_rate: 20000 up_threshold: 95
  • 24. ENGINEERS AND DEVICES WORKING TOGETHER Tuning ● schedutil rate_limit_us: 20000
  • 25. ENGINEERS AND DEVICES WORKING TOGETHER AnTuTu Total (higher is better) trial 1 trial 2 trial 3 avg stddev ondemand 31328 31478 31026 31277 230 interactive 31796 30724 30405 30975 728 schedutil 30874 30512 30526 30637 205 Respectable result for schedutil.
  • 26. ENGINEERS AND DEVICES WORKING TOGETHER recentfling (lower is better) % janky frames trial 1 trial 2 trial 3 avg stddev ondemand 18% 19% 18% 18.3% 0.57 interactive 11% 17% 14% 14% 3 schedutil 33% 45% 43% 40.3% 6.4 Nasty regression for schedutil. Needs further investigation. PELT? WALT?
  • 27. ENGINEERS AND DEVICES WORKING TOGETHER emailfling (lower is better) % janky frames trial 1 trial 2 trial 3 avg stddev ondemand 1% 0% 0% 0.33% 0.57 interactive 4% 3% 2% 3% 1 schedutil 0% 0% 1% 0.33% 0.57 Results in the noise.
  • 28. ENGINEERS AND DEVICES WORKING TOGETHER browserfling (lower is better) pct janky frames trial 1 trial 2 trial 3 avg stddev ondemand 0% 0% 0% 0% 0 interactive 8% 8% 7% 7.66% 0.57 schedutil 0% 0% 0% 0% 0 Good result for schedutil here...
  • 29. ENGINEERS AND DEVICES WORKING TOGETHER galleryfling (lower is better) % janky frames trial 1 trial 2 trial 3 avg stddev ondemand 0% 0% 0% 0% 0 interactive 1% 1% 1% 1% 0 schedutil 1% 1% 1% 1% 0 Results in noise.
  • 30. ENGINEERS AND DEVICES WORKING TOGETHER Idle home screen energy (lower is better) J trial 1 trial 2 trial 3 avg stddev ondemand 12.6 12.935 12.955 12.83 0.20 interactive 13.734 13.717 13.71 13.72 0.01 schedutil 14.017 13.875 13.893 13.93 0.07 Schedutil is competitive.
  • 31. ENGINEERS AND DEVICES WORKING TOGETHER Mp3 playback energy (lower is better) J trial 1 trial 2 trial 3 avg stddev ondemand 22.888 23.127 23.004 23.01 0.12 interactive 23.871 23.928 23.467 23.76 0.25 schedutil 23.953 23.866 23.746 23.86 0.10 Schedutil is competitive.
  • 32. ENGINEERS AND DEVICES WORKING TOGETHER 720p mpeg4 playback energy (lower is better) J trial 1 trial 2 trial 3 avg stddev ondemand 20.375 20.485 20.739 20.53 0.18 interactive 19.505 20.095 19.331 19.64 0.40 schedutil 21.103 20.879 20.766 20.92 0.17 Schedutil is competitive.
  • 33. ENGINEERS AND DEVICES WORKING TOGETHER Test Build 2 ● Android 4.4 hikey kernel + EAS 5.2 - schedfreq/schedtune + schedutil/cpufreq from test build 1 ○ Thanks to Juri Lelli for providing this branch ● AOSP master as August 22
  • 34. ENGINEERS AND DEVICES WORKING TOGETHER Tuning ● Interactive above_hispeed_delay: 20000 boostpulse_duration: 80000 go_hispeed_load: 99 hispeed_freq: 1200000 io_is_busy: 0 min_sample_time: 80000 target_loads: 90 timer_rate: 20000 timer_slack: 80000
  • 35. ENGINEERS AND DEVICES WORKING TOGETHER Tuning ● Ondemand ignore_nice_load: 0 io_is_busy: 0 min_sampling_rate: 10000 powersave_bias: 0 sampling_down_factor: 1 sampling_rate: 20000 up_threshold: 95
  • 36. ENGINEERS AND DEVICES WORKING TOGETHER Tuning ● schedutil rate_limit_us: 20000
  • 37. ENGINEERS AND DEVICES WORKING TOGETHER AnTuTu Total (higher is better) trial 1 trial 2 trial 3 avg stddev ondemand 29959 30066 30108 30044 77 interactive 31050 31083 30863 30998 118 schedutil 29606 29279 28942 29275 332 schedutil-w 30364 30607 30447 30472 123 perf 31688 31413 31548 31549 137 WALT clearly helps schedutil on AnTuTu.
  • 38. ENGINEERS AND DEVICES WORKING TOGETHER recentfling (lower is better) % janky frames trial 1 trial 2 trial 3 avg stddev ondemand 30% 30% 31% 30.3% 0.57 interactive 18% 17% 21% 18.6% 2.08 schedutil 39% 44% 42% 41.6% 2.5 schedutil-w 22% 32% 36% 30% 7.2 perf 23% 16% 14% 17.6% 4.7 WALT also helps with recentfling regression (not completely though).
  • 39. ENGINEERS AND DEVICES WORKING TOGETHER emailfling (lower is better) % janky frames trial 1 trial 2 trial 3 avg stddev ondemand 0% 0% 0% 0% 0 interactive 0% 1% 1% 0.66% 0.57 schedutil 5% 4% 5% 4.67% 0.57 schedutil-w 6% 6% 4% 5.33% 1.15 perf 0% 0% 0% 0% 0 Respectable result for schedutil.
  • 40. ENGINEERS AND DEVICES WORKING TOGETHER browserfling (lower is better) pct janky frames trial 1 trial 2 trial 3 avg stddev ondemand 0% 0% 0% 0% 0 interactive 2% 1% 1% 1.3% 0.57 schedutil 9% 7% 5% 7% 2 schedutil-w 3% 4% 8% 5% 2.64 perf 0% 0% 0% 0% 0 Possible small regression in browserfling.
  • 41. ENGINEERS AND DEVICES WORKING TOGETHER galleryfling (lower is better) % janky frames trial 1 trial 2 trial 3 avg stddev ondemand 0% 0% 1% 0.33% 0.57 interactive 1% 1% 2% 1.33% 0.57 schedutil 20% 21% 27% 22.66% 3.79 schedutil-w 5% 6% 6% 5.66% 0.57 perf 4% 4% 4% 4% 0 Regression with schedutil.
  • 42. ENGINEERS AND DEVICES WORKING TOGETHER Idle home screen energy (lower is better) J trial 1 trial 2 trial 3 avg stddev ondemand 11.704 11.761 11.730 11.73 0.03 interactive 10.685 10.753 10.844 10.76 0.08 schedutil 10.47 11.554 10.613 10.87 0.59 schedutil-w 12.146 12.144 12.127 12.14 0.01 perf 12.999 13.187 12.822 13.00 0.18 Energy regression with WALT.
  • 43. ENGINEERS AND DEVICES WORKING TOGETHER Mp3 playback energy (lower is better) J trial 1 trial 2 trial 3 avg stddev ondemand 20.044 20.992 21.178 20.74 0.61 interactive 21.699 21.933 21.667 21.76 0.15 schedutil 18.458 18.446 18.471 18.46 0.01 schedutil-w 22.87 22.914 22.995 22.93 0.01 perf 22.539 23.445 22.869 22.951 0.46 Energy regression with WALT.
  • 44. ENGINEERS AND DEVICES WORKING TOGETHER 720p mpeg4 playback energy (lower is better) J trial 1 trial 2 trial 3 avg stddev ondemand 19.932 19.443 19.578 19.651 0.25 interactive 19.34 19.408 19.295 19.347 0.06 schedutil 17.48 17.508 17.485 17.491 0.01 schedutil-w 21.313 21.028 21.218 21.186 0.15 perf 21.574 20.979 21.263 21.272 0.30 Energy regression with WALT.
  • 45. ENGINEERS AND DEVICES WORKING TOGETHER Next Steps ● test framework ○ repeatability ○ WA stability ● deeper result analysis ○ recentfling regression ○ possible galleryfling regression ○ energy regression with WALT ● incorporate schedtune
  • 46. Thank You #LAS16 For further information: www.linaro.org LAS16 keynotes and videos on: connect.linaro.org