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Issue 865676 link

Starred by 1 user
Status: WontFix
Owner:
thomasanderson@chromium.org
Closed: Jul 23
Cc:
npm@chromium.org
thomasanderson@chromium.org
EstimatedDays: ----
NextAction: ----
OS: ----
Pri: 2
Type: Bug-Regression



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3.6% regression in rendering.desktop at 575372:575398

Project Member Reported by npm@chromium.org, Jul 19 
See the link to graphs below.
Project Member

Comment 1 by 42576172...@developer.gserviceaccount.com, Jul 19 

All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=865676

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=594cebd5e967417b4baa61077f0b116aa48ab809603c9e257b020afebe2296fd


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

linux-perf
Project Member

Comment 3 by 42576172...@developer.gserviceaccount.com, Jul 20 

📍 Couldn't reproduce a difference.
https://pinpoint-dot-chromeperf.appspot.com/job/10162b99a40000
Project Member

Comment 5 by 42576172...@developer.gserviceaccount.com, Jul 20 

📍 Couldn't reproduce a difference.
https://pinpoint-dot-chromeperf.appspot.com/job/142da53ea40000
Project Member

Comment 7 by 42576172...@developer.gserviceaccount.com, Jul 21

Cc: thomasanderson@chromium.org
Owner: thomasanderson@chromium.org
Status: Assigned (was: Untriaged)
📍 Found a significant difference after 1 commit.
https://pinpoint-dot-chromeperf.appspot.com/job/122a6969a40000

Roll fontconfig to d1f48f11 by thomasanderson@chromium.org
https://chromium.googlesource.com/chromium/src/+/3ff47e60c5ce645973e57fc8dbe88b43d63edaf4
17.01 → 17.31 (+0.2986)

Understanding performance regressions:
  http://g.co/ChromePerformanceRegressions

Comment 8 by thomasanderson@chromium.org, Jul 23

Status: WontFix (was: Assigned)
Original fontconfig roll introduced a bug:
https://chromium.googlesource.com/chromium/src/+/a0c1584a2fade0146b7cd3380abe42feda02ad7c

Subsequent fontconfig roll fixed the regression introduced in the previous roll:
https://chromium.googlesource.com/chromium/src/+/a0c1584a2fade0146b7cd3380abe42feda02ad7c

The graphs indicate a performance improvement on the original roll that introduced the bug, and a regression after.  These performance differences are expected due to the nature of the bug introduced and then fixed.
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