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Issue metadata

Status: Duplicate
Merged: issue 730119
Owner: ----
Closed: Jun 2017
Cc:
EstimatedDays: ----
NextAction: ----
OS: ----
Pri: 2
Type: Bug-Regression



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2.1%-14.2% regression in media_perftests at 476915:476958

Project Member Reported by chcunningham@chromium.org, Jun 6 2017

Issue description

These regressions all appear to be a retrun to a previous average from ~100 revisions prior. Likely some change landed and reverted. Bisects just to be sure.
 
Mergedinto: 730119
Status: Duplicate (was: Untriaged)

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

Suspected Commit
  Author : hans
  Commit : ba2ff9ad0d643a443575c839e56ae9edf7106643
  Date   : Mon Jun 05 02:02:06 2017
  Subject: Revert of "win: Set is_clang=true by default over the weekend."

Bisect Details
  Configuration: winx64_10_perf_bisect
  Benchmark    : media.tough_video_cases
  Metric       : vm_working_set_delta_size/tulip2.mp4_gpu
  Change       : 2.02% | 23586.6666667 -> 24062.6666667

Revision             Result                  N
chromium@476917      23586.7 +- 119.956      6      good
chromium@476920      23528.0 +- 53.3667      6      good
chromium@476921      23970.0 +- 59.7997      6      bad       <--
chromium@476922      23985.3 +- 77.08        6      bad
chromium@476923      24049.3 +- 97.1048      6      bad
chromium@476928      24014.0 +- 138.42       6      bad
chromium@476938      23964.7 +- 99.3445      6      bad
chromium@476958      24062.7 +- 157.852      6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=release_x64 --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests media.tough_video_cases

Debug Info
  https://chromeperf.appspot.com/buildbucket_job_status/8977508185636714496

Is this bisect wrong?
  https://chromeperf.appspot.com/bad_bisect?try_job_id=6142999597154304


| 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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