69803 - Kernel usage pops up when displaying Viewer Demo #13 (DHTML) with your mouse moving.

Status: RESOLVED WORKSFORME

(Core :: Layout, defect)

Description

[doctor__j]

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; 0.8) Gecko/20010221
BuildID:    2001022105

During the display of Viewer Demo test #13 (DHTML), kernel usage surges from
10-15% to 70-80% (no other apps running) whenever
the mouse is moving.

The "Red", "Green" & "Blue" flying texts runs very smoothly when the mouse is
moving.  They move jerkily (comparitively) when the mouse stops moving.

Mouse cursor redraw forces the flying texts to be re-rendered more frequently??


Reproducible: Always
Steps to Reproduce:
1) Open "Debug Menu" in your browser.
2) Choose "Viewer Demos"
3) Choose "#13 DHTML"
4) Move your mouse around and see the difference in text movement.

Comment 1

[Asa Dotzler [:asa]]

over to chofmann for triage.

Comment 2

[chris hofmann]

dave can you profile this?

Comment 3

[Keyser Sose]

Marking NEW.

Comment 4

[Mike Young]

This happens at almost any animated DHTML page. for some reason mousing over the
animation causes both processor use to increase and causes the animation to go
faster (or, from bug 35819, go the proper speed because the regular is too slow)

Comment 5

[dprice (gone)]

profiling this with quantify happily causes it to crash.  Not right away.  Oh
no... about 90% through the summary state it says it has corrupted data and
doesn't want to continue.

Comment 6

[dprice (gone)]

-> cathleen for a new home

Comment 7

[Asa Dotzler [:asa]]

adding cathleen (again)

Comment 8

[Asa Dotzler [:asa]]

->layout

Comment 9

[Mike Young]

ummm are we no longer including the Viewer demos in the nightly builds? Are they
located online anywhere so we can continue testing?

Comment 10

[Markus Hübner]

Mike, viewer demo should still be in nightly builds.

Comment 11

[Mike Young]

you are correct. They were out of the builds for a period a while back. I can't
verify that the kernel usage increases, because it appears that kernel usage is
increasing due to other bugs in today's builds. 

Comment 12

[Markus Hübner]

Using trunk build 2002121908 on winxp pro sp1, 1.1ghz, 512ram the cpu usage is 
constantly at 100% while running the (really slow) DHTML Viewer Demo.

Comment 13

[Christopher Hoess (gone)]

Using build 2003040604, Win XP, 2.2 GHz, 512 M RAM, Viewer Demo #13 is running fine.

Comment 14

[Sterling Bates]

Probably the steroids in your machine :)  build 20030421 crawls on my 450 PII
WinXP 196MB RAM.

Any reason this is a dupeme?  

Comment 15

[Vedran Miletic]

retargeting

Comment 16

[Carsten Book [:Tomcat]]

WFM, tested with 1.8b on Windows 2000 SP4

Comment 17

[Robin Monks]

Also WFM on Windows XP Sp2 with Mozilla 1.8Beta.  Marking WFM.