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Issue metadata

Status: Duplicate
Merged: issue 666313
Owner: ----
Closed: Nov 2016
Cc:
EstimatedDays: ----
NextAction: ----
OS: ----
Pri: 2
Type: Bug-Regression



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8.5%-33% regression in smoothness.sync_scroll.key_mobile_sites_smooth at 432249:432270

Project Member Reported by mustaq@chromium.org, Nov 17 2016

Issue description

See the link to graphs below.
 
Project Member

Comment 3 by 42576172...@developer.gserviceaccount.com, Nov 17 2016

Mergedinto: 666313
Status: Duplicate (was: Untriaged)

===== BISECT JOB RESULTS =====
Status: completed


===== SUSPECTED CL(s) =====
Subject : Set WebFont priority to very low if the network is detected to be slow
Author  : tbansal
Commit description:
  
When the network is detected to be slow, Blink immediately changes to
using fallback font. This CL changes the Blink resource priority of the
WebFont resource to VeryLow since the font is no longer required for
text paint.

BUG= 665504 

Review-Url: https://codereview.chromium.org/2494243003
Cr-Commit-Position: refs/heads/master@{#432254}
Commit  : 5ea0c57befbcadba648b21447e83d5d4a280c885
Date    : Tue Nov 15 21:00:15 2016


===== TESTED REVISIONS =====
Revision         Mean     Std Dev  N  Good?
chromium@432248  12.9285  2.63988  8  good
chromium@432251  12.6751  1.46599  8  good
chromium@432253  13.1964  1.64013  8  good
chromium@432254  18.6438  3.16496  5  bad    <--
chromium@432259  19.1154  4.49057  5  bad
chromium@432270  19.4418  3.24524  5  bad

Bisect job ran on: android_nexus5X_perf_bisect
Bug ID: 666398

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=Wordpress smoothness.sync_scroll.key_mobile_sites_smooth
Test Metric: mean_input_event_latency/Wordpress
Relative Change: 50.38%

Buildbot stdio: http://build.chromium.org/p/tryserver.chromium.perf/builders/android_nexus5X_perf_bisect/builds/885
Job details: https://chromeperf.appspot.com/buildbucket_job_status/8995722185668182560


Not what you expected? We'll investigate and get back to you!
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5905102106263552

| 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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