834782 - WebGL uniform setters regression compared to Firefox 18

Status: RESOLVED WONTFIX

(Core :: Graphics: CanvasWebGL, defect)

Description

[Benoit Jacob [:bjacob] (mostly away)]

This is spun off from bug 832576. We fixed the bigger part of the performance regression reported there, but according to bug 832576 comment 5 there remains a 25% performance regression compared to Firefox 18.

Testcase:
http://hg.mozilla.org/users/bjacob_mozilla.com/webgl-perf-tests/raw-file/3729e8afac99/uniform-float-taking-typed-array.html

To do:
- reproduce the regression
- profile both Nightly and Firefox 18, compare profiles. Where's the difference?

Comment 1

[u279076]

Firefox 18.0:
> frames: 65 total ms: 3000.25
> median: 45.20 ms
> average: 46 ms
> standard deviation: 6 ms (14% of median)

Firefox 51.0a1:
> frames: 43 total ms: 3154.13
> median: 45.48 ms
> average: 73 ms
> standard deviation: 81 ms (178% of median)

Seems like median is negligible between versions but there is significant deviation in frames, average, and std dev from Fx18 to 51. Is this the regression? If so I can try to regress this further. Please advise.

Comment 2

[Kelsey Gilbert [:jgilbert]]

That's a long way back. Let's just close this.