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58.8% regression in system_health.common_mobile at 438777:438799 |
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Issue descriptionSee the link to graphs below.
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Dec 19 2016
Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8992815503340260864
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Dec 19 2016
=== PERF REGRESSION === === Auto-CCing suspected CL author ksakamoto@chromium.org === Hi ksakamoto@chromium.org, the bisect results pointed to your CL, please take a look at the results. ===== BISECT JOB RESULTS ===== Status: completed ===== SUSPECTED CL(s) ===== Subject : [FirstMeaningfulPaint] Do not stop observing layouts before FirstContentfulPaint Author : ksakamoto Commit description: This should mitigate a bug that FirstMeaningfulPaint is reported too soon (or not reported) on some CPU-heavy pages, because network idle is detected while CPU is busy running scripts. BUG= 659021 , 674228 CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2 Review-Url: https://codereview.chromium.org/2581633002 Cr-Commit-Position: refs/heads/master@{#438791} Commit : 2b891d60b92a6066fa1620794e244ef6e0ce65e2 Date : Thu Dec 15 09:27:55 2016 ===== TESTED REVISIONS ===== Revision Mean Std Dev N Good? chromium@438776 1195.35 1115.61 14 good chromium@438788 1192.33 738.133 9 good chromium@438790 1184.71 120.35 6 good chromium@438791 1816.71 200.121 6 bad <-- chromium@438794 1793.08 249.43 9 bad chromium@438799 1842.82 221.507 9 bad Bisect job ran on: android_nexus5_perf_bisect Bug ID: 675703 Test Command: src/tools/perf/run_benchmark -v --browser=android-chromium --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=load.tools.drive system_health.common_mobile Test Metric: timeToFirstMeaningfulPaint_avg/load_tools/load_tools_drive Relative Change: 54.17% Buildbot stdio: http://build.chromium.org/p/tryserver.chromium.perf/builders/android_nexus5_perf_bisect/builds/4474 Job details: https://chromeperf.appspot.com/buildbucket_job_status/8992815503340260864 Not what you expected? We'll investigate and get back to you! https://chromeperf.appspot.com/bad_bisect?try_job_id=5793226739417088 | O O | Visit http://www.chromium.org/developers/speed-infra/perf-bug-faq | X | for more information addressing perf regression bugs. For feedback, | / \ | file a bug with component Tests>AutoBisect. Thank you!
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Dec 20 2016
This is working as intended. Before my change, first meaningful paint was reported incorrectly. |
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Comment 1 by jasontiller@chromium.org
, Dec 19 2016