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Issue 597261 link

Starred by 2 users
Status: Duplicate
Merged: issue 612682
Owner: ----
Closed: Jun 2016
Cc:
adlr@chromium.org
piman@chromium.org
zork@chromium.org
hsiangc@chromium.org
sky@chromium.org
est...@chromium.org
█ littlecvr@chromium.org
osh...@chromium.org
█ zelidrag@chromium.org
█ dbehr@chromium.org
Components:
EstimatedDays: ----
NextAction: ----
OS: Chrome
Pri: 1
Type: Bug



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peach_pi: tab contents freeze when moving cursor over bookmark bar

Project Member Reported by djkurtz@chromium.org, Mar 23 2016 
Chrome Version: 49.0.2623.102
Chrome OS Version: 7834.63.0
Chrome OS Platform: peach_pi

Steps To Reproduce:
(1) Log in to account with many bookmarks
(2) Browse to some usually 60 FPS content:
    http://webglsamples.org/aquarium/aquarium.html
    https://webkit.org/blog-files/3d-transforms/poster-circle.html
    http://videojs.com/
(3) Use touchpad to wiggle cursor over bookmark bar

Expected Result:

Content continues at 60 FPS.

Actual Result:

Content slows to a crawl, or even halts completely.

How frequently does this problem reproduce? (Always, sometimes, hard to
reproduce?)

What is the impact to the user, and is there a workaround? If so, what is
it?

Content updates extremely slow when moving mouse over bookmarks.

Please provide any additional information below. Attach a screen shot or
log if possible.

Note: wiggling cursor over the tab contents does *NOT* affect performance.

Comment 1 by djkurtz@chromium.org, Mar 25 2016 

Attached is a trace showing the pause.

The freeze is ~3-4 second time frame, and corresponds to where CrBrowserMain is very busy doing many "DispatchMouseMoveEvent", where each one takes ~20-24 ms.

I see other "DispatchMouseMoveEvent" events in the trace, too... but they typically only take ~2ms.  I presume the other events are over the tab content, not the bookmark bar.
trace_peach_pi-aquarium-bookmarkBar-freeze-full.json.gz
4.6 MB Download

Comment 2 by djkurtz@chromium.org, Mar 25 2016

Cc: sky@chromium.org osh...@chromium.org zelidrag@chromium.org zork@chromium.org est...@chromium.org
I just tried again on latest dev channel image for peach_pi:
	8108.0.0
	51.0.2689.0

The problem is still there...  The trace is attached.  The "DispatchMouseMoveEvent" are spending all of their time in "AshWindowTreeHostPlatform::DispatchEvent"

Also, on R51, I also some 'black flashing' over the bookmark icons (issue 593449).


I also tried the same action (wiggling mouse on bookmark bar on a tab w/ webgl aquarium) on R51 samus (8100.0.0 / 51.0.2687.0).  The UI did not freeze, but I can see some aquarium FPS glitches.  Trace attached.
trace_peach_pi-aquarium-bookmarkBar-freeze-R51.json.gz
5.7 MB Download
trace_samus_aquarium_jank_bookmarkBar_R51.json.gz
6.4 MB Download

Comment 3 by rohi...@chromium.org, Apr 1 2016

Cc: hsiangc@chromium.org

Comment 4 by djkurtz@chromium.org, Jun 16 2016

Mergedinto: 612682
Owner: ----
Status: Duplicate (was: Assigned)
Actually, this only happens on *my* bookmark bar, b/c I have a bookmark with elided text, and text elision on the bookmark bar is exremely slow (see  issue 62682 ).
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