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Issue 700186 link

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Issue metadata

Status: Duplicate
Merged: issue 699753
Owner: ----
Closed: Mar 2017
Cc:
EstimatedDays: ----
NextAction: ----
OS: ----
Pri: 2
Type: Bug-Regression



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4.5% regression in page_cycler_v2.typical_25 at 454740:454985

Project Member Reported by benhenry@google.com, Mar 9 2017

Issue description

See the link to graphs below.
 
All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=700186

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDglP_8qwsM


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

chromium-rel-mac11
Project Member

Comment 3 by 42576172...@developer.gserviceaccount.com, Mar 10 2017

Mergedinto: 699753
Status: Duplicate (was: Untriaged)

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

Suspected Commit
  Author : csharrison
  Commit : 279edadbd6962b7afa97c166896ae69ceb797da4
  Date   : Mon Mar 06 17:05:49 2017
  Subject: Turn off LazyParseCSS on trybots for now

Bisect Details
  Configuration: mac_10_11_perf_bisect
  Benchmark    : page_cycler_v2.typical_25
  Metric       : timeToFirstContentfulPaint_avg/pcv1-warm/http___www.imdb.com_title_tt0910970_
  Change       : 4.43% | 77.4588333368 -> 80.8886666795

Revision             Result                  N
chromium@454739      77.4588 +- 1.25549      6      good
chromium@454854      77.986 +- 2.71815       6      good
chromium@454871      78.001 +- 1.42911       6      good
chromium@454875      77.635 +- 0.845626      6      good
chromium@454877      77.7193 +- 1.39344      6      good
chromium@454878      78.2925 +- 1.66272      6      good
chromium@454879      80.394 +- 1.72513       6      bad       <--
chromium@454887      80.726 +- 1.71587       6      bad
chromium@454920      81.006 +- 3.12544       6      bad
chromium@454985      80.8887 +- 2.6607       6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=release --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=http...www.imdb.com.title.tt0910970. page_cycler_v2.typical_25

Debug Info
  https://chromeperf.appspot.com/buildbucket_job_status/8985559254159841792

Is this bisect wrong?
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5880504580046848


| 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 Speed>Bisection.  Thank you!

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