All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=640136

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgno-QvwsM


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

chromium-rel-mac-hdd

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/9003553090700954912

=== Auto-CCing suspected CL author hans@chromium.org ===

Hi hans@chromium.org, the bisect results pointed to your CL below as possibly
causing a regression. Please have a look at this info and see whether
your CL be related.


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


===== SUSPECTED CL(s) =====
Subject : Roll clang 277962:278861
Author  : Hans Wennborg
Commit description:
  
BUG= 636558 , 637866 
R=dcheng@chromium.org, dpranke@chromium.org, inferno@chromium.org, rnk@chromium.org

Review URL: https://codereview.chromium.org/2241413003 .

Cr-Commit-Position: refs/heads/master@{#413337}
Commit  : 3829c6ad5aeef24992be742340df28c324da9e61
Date    : Sat Aug 20 14:43:07 2016


===== TESTED REVISIONS =====
Revision         Mean     Std Dev  N  Good?
chromium@413335  1545.5   107.592  5  good
chromium@413336  1487.71  9.02423  5  good
chromium@413337  2026.01  30.0726  5  bad    <--
chromium@413339  2028.48  13.068   5  bad

Bisect job ran on: mac_hdd_perf_bisect
Bug ID: 640136

Test Command: src/tools/perf/run_benchmark -v --browser=release --output-format=chartjson --upload-results --also-run-disabled-tests blink_perf.layout
Test Metric: floats_10_1000/floats_10_1000
Relative Change: 31.25%
Score: 99.9

Buildbot stdio: http://build.chromium.org/p/tryserver.chromium.perf/builders/mac_hdd_perf_bisect/builds/753
Job details: https://chromeperf.appspot.com/buildbucket_job_status/9003553090700954912


Not what you expected? We'll investigate and get back to you!
  https://chromeperf.appspot.com/bad_bisect?try_job_id=6427921535729664

| 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!

I think this problem is fixed and can be closed: the performance went back to 1400 as of 2016-08-24.

Thanks for checking.