All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=739106

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnpeatQkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7omNsAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7quC9wgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnv-qtwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgntPNtQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnvi-4QgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7r63sAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg3pz3vwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnpXX_AsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7smXsggM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnpnsrwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg3orrtgsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg3tiIvQsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnram_wgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg3qyMtgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgntiw4AoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnof1twoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7oapuAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7oKY3QkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqOzqQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnoXqigsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnp2bhwgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnpbW6AgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnvmi6QoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnrKriwgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7qmh5gsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7o2tywoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7oe6lAgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgntiBuQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnoOssQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnpuduAsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgntveowoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnvb5vAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7v6G-QgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnpv7pQsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7tnW_gkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqzj6wgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnuK08AsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7uuF9QsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqiyrgsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnoDI-woM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnsLP8wsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnvLn4QsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqzjqwsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqqaoAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqzjqwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnoDI-wgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqz3ugkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7o_S4wsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7sOWqAsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnuTZhwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7tP6lwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7vuZvgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqqvpAsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnr6PgwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnt2j8AgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7qfQgAsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgntbeswsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7vuO7woM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnvLn4QkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnt2u_woM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7vuZvgsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7vfcyAgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnoXTpwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7tXznQsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnpzD_QsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgns2zvAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnuSX9wsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnsTA2wgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnprKtwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7oKY3QgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg3ujGpwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7vvS9ggM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7vvStgsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnrLIlAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgntr8uAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnpq0pgsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7qXZ8QgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgntHvtAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnsWC_goM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnr2_sgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnsrisgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7qvx7wsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnujLowsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7u2uxgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqqvpAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7u-MhwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnumyowkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7ve_nQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7sLj8QkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnoKpkAgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqzU7QgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnrqj7ggM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg3pzepgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg3pjksQsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7omNsAgM


Bot(s) for this bug's original alert(s):

android-nexus6
android-one
android-webview-nexus5X
android-webview-nexus6
chromium-rel-mac-retina
chromium-rel-mac11
chromium-rel-mac11-pro
chromium-rel-mac12
chromium-rel-win10
win-high-dpi

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8975010452454869664

=== Auto-CCing suspected CL author reed@google.com ===

Hi reed@google.com, the bisect results pointed to your CL, please take a look at the
results.


=== BISECT JOB RESULTS ===
Perf regression found with culprit

Suspected Commit
  Author : Mike Reed
  Commit : 638b500582b0ffb30843452c6895f775be3b31dd
  Date   : Thu Jun 29 16:15:07 2017
  Subject: use rasterpipeline for non-N32 formats

Bisect Details
  Configuration: android_one_perf_bisect
  Benchmark    : smoothness.sync_scroll.key_mobile_sites_smooth
  Metric       : mean_input_event_latency/http___cuteoverload.com
  Change       : 326.54% | 49.8046666667 -> 212.439

Revision             Result                  N
chromium@483330      49.8047 +- 8.31555      6      good
chromium@483354      54.8638 +- 19.0181      6      good
chromium@483366      49.0682 +- 6.2751       6      good
chromium@483372      49.8418 +- 4.5861       6      good
chromium@483375      48.273 +- 4.79646       6      good
chromium@483377      51.432 +- 8.07612       6      good
chromium@483378      244.28 +- 319.94        6      bad       <--
chromium@483426      212.439 +- 222.145      6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=android-chromium --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=http...cuteoverload.com smoothness.sync_scroll.key_mobile_sites_smooth

More information on addressing performance regressions:
  http://g.co/ChromePerformanceRegressions

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8975010452454869664


For feedback, file a bug with component Speed>Bisection

Explictly assigning. A CL you landed tripped one of the speed metrics we measure in the lab. If this is the first time this has happened to one of your CLs, or if it's been a while, please read: https://chromium.googlesource.com/chromium/src/+/master/docs/speed/addressing_performance_regressions.md

We're looking for one of the following:
1. Justification via explanation
2. Plan to revert or fix
3. Angry rage throwing of equipment at my head

Just be aware that I'm trained in trumpet playing and First Aid and am not afraid to use it.

Note: This was a bulk edit message and not very personal.

reed: any chance to investigate this?

The change was part of a long series related to the 'raster pipeline' design

- reduce code size
- take advantage of advanced SIMD instructions (sometimes pre-compiled)
- enable broader set of pixel formats : half-float, color-correct, RGBA/BGRA swizzles

The particular flagged CL can not be reverted, as it is tied to a long series of related changes.

What we can do next is, with guidance on relative priorities, profile specific tests and see what opportunities can be found to speed them up.

reed: any update on the work in #8?

Just checked https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnpeatQkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7omNsAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7quC9wgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnv-qtwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgntPNtQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnvi-4QgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7r63sAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg3pz3vwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnpXX_AsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7smXsggM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnpnsrwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg3orrtgsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg3tiIvQsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnram_wgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg3qyMtgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgntiw4AoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnof1twoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7oapuAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7oKY3QkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqOzqQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnoXqigsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnp2bhwgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnpbW6AgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnvmi6QoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnrKriwgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7qmh5gsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7o2tywoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7oe6lAgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgntiBuQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnoOssQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnpuduAsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgntveowoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnvb5vAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7v6G-QgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnpv7pQsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7tnW_gkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqzj6wgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnuK08AsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7uuF9QsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqiyrgsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnoDI-woM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnsLP8wsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnvLn4QsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqzjqwsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqqaoAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqzjqwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnoDI-wgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqz3ugkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7o_S4wsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7sOWqAsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnuTZhwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7tP6lwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7vuZvgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqqvpAsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnr6PgwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnt2j8AgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7qfQgAsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgntbeswsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7vuO7woM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnvLn4QkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnt2u_woM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7vuZvgsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7vfcyAgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnoXTpwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7tXznQsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnpzD_QsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgns2zvAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnuSX9wsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnsTA2wgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnprKtwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7oKY3QgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg3ujGpwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7vvS9ggM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7vvStgsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnrLIlAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgntr8uAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnpq0pgsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7qXZ8QgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgntHvtAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnsWC_goM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnr2_sgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnsrisgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7qvx7wsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnujLowsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7u2uxgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqqvpAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7u-MhwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnumyowkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7ve_nQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7sLj8QkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnoKpkAgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqzU7QgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnrqj7ggM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg3pzepgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg3pjksQsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7omNsAgM

Most graphs have already come down so maybe our "raster pipeline" has already been improved to eliminate such performance issues? mtklein@: can you please check if that's the case?

This is way too old now to make sense of or do anything about directly.  Please consider this a retroactive WontFix circa Sept. 2017.