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Last Comment Bug 691775 - 3.3% performance regression in tscroll suite on XP after landing of bug 666446
: 3.3% performance regression in tscroll suite on XP after landing of bug 666446
Product: Core
Classification: Components
Component: ImageLib (show other bugs)
: Trunk
: x86 Windows XP
: -- normal with 2 votes (vote)
: ---
Assigned To: Scott Johnson (:jwir3)
: Milan Sreckovic [:milan] (PTO through Oct 23)
Depends on:
Blocks: 666446
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Reported: 2011-10-04 08:41 PDT by Scott Johnson (:jwir3)
Modified: 2012-01-05 13:03 PST (History)
16 users (show)
See Also:
Crash Signature:
QA Whiteboard:
Iteration: ---
Points: ---
Has Regression Range: ---
Has STR: ---

b691775 - Patch (v1) (2.78 KB, patch)
2011-11-02 15:10 PDT, Scott Johnson (:jwir3)
no flags Details | Diff | Splinter Review

Description Scott Johnson (:jwir3) 2011-10-04 08:41:48 PDT
Talos suites for winXP after bug 666446 landed is showing a regression in tscroll and tdhtml:
tdhtml: 723.68 ([{%22test%22:%2218%22,%22branch%22:%221%22,%22machine%22:%22507%22,%22testrun%22:%228555367%22}])
tscroll: 14618.1 ([{%22test%22:%2271%22,%22branch%22:%221%22,%22machine%22:%22507%22,%22testrun%22:%228555371%22}])

Previous check-in results were:
    tdhtml: 539.82 ([{%22test%22:18,%22branch%22:1,%22machine%22:667,%22testrun%22:8549730}])
    tscroll: 11570.2 ([{%22test%22:71,%22branch%22:1,%22machine%22:667,%22testrun%22:8549734}])

This looks like a 26% increase in time required to execute tscroll, and a 34% increase in time required for tdhtml, but only on WinXP.
Comment 1 Scott Johnson (:jwir3) 2011-11-01 14:46:18 PDT
This was fixed with the latest patch to bug 666446. bug 666446 was backed out, and when recommitted, it will longer suffer from this issue.
Comment 2 Timothy Nikkel (:tnikkel) 2011-11-01 19:16:12 PDT
There was a tscroll regression email for XP that included these patches, although it is much smaller.
Comment 3 Scott Johnson (:jwir3) 2011-11-01 20:12:53 PDT
Ok, I'm reopening this bug to track this issue.
Comment 4 Scott Johnson (:jwir3) 2011-11-02 09:01:51 PDT
So, it looks like this is still being caused by nsImageLoader. I intend to have this isolated and a patch posted today.
Comment 5 Scott Johnson (:jwir3) 2011-11-02 14:46:46 PDT
Ok.. I think I found the problem. I'll push a patch in a second for review, but the following Talos test results on try seem to show the problem:

Basically, what's happening is that I tried to use the logic in nsLayoutUtils::DeregisterIfNotAnimated() in order to be consistent with the other invocations during Load, but having to register and then immediately deregister again is inefficient, so I did the animation check up front and only register if the new image is animated.
Comment 6 Scott Johnson (:jwir3) 2011-11-02 15:10:55 PDT
Created attachment 571472 [details] [diff] [review]
b691775 - Patch (v1)
Comment 7 Robert O'Callahan (:roc) (email my personal email if necessary) 2011-11-02 15:20:35 PDT
Comment on attachment 571472 [details] [diff] [review]
b691775 - Patch (v1)

Review of attachment 571472 [details] [diff] [review]:

It seems weird that this would cause a noticeable performance effect.

::: layout/base/nsImageLoader.cpp
@@ +152,5 @@
> +      bool isAnimated;
> +      nsresult rv = imageContainer->GetAnimated(&isAnimated);
> +      if (NS_SUCCEEDED(rv) && isAnimated) {
> +        nsLayoutUtils::RegisterImageRequest(presContext, mRequest,
> +                                            &mRequestRegistered);

Doesn't this mean that a partially loaded image is never registered?
Comment 8 Scott Johnson (:jwir3) 2011-11-10 07:21:56 PST
This should no longer be an issue with bug 666446. Please reopen if I am incorrect.
Comment 9 Alex Keybl [:akeybl] 2012-01-05 12:50:33 PST
Tracking bug 666446 instead, but this bug may still be reopened for FF10.

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