701713 - Kraken benchmark 3x slower in Firefox 9 beta

Status: RESOLVED DUPLICATE of bug 699528

(Core :: JavaScript Engine, defect)

Description

[davidtryse+bz]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:9.0) Gecko/20100101 Firefox/9.0
Build ID: 20111109112850

Steps to reproduce:

Might just be something related to this particular machine or profile, but the Kraken javascript benchmark scores after upgrading to Firefox 9 beta seem to be ~3x slower.

Particularly the gaussian-blur and darkroom sub-tests have worse scores (15x/6x as slow).


Actual results:

Firefox 9beta (all about:config javascript options default)
http://goo.gl/tEzxn
17358.7ms
http://goo.gl/Ii4Hg
17136.4ms
V8 Score: 1172

Firefox 9beta with javascript.options.typeinference = false
http://goo.gl/h4tnZ
14500.0ms

Firefox 8beta6
http://goo.gl/yhiEH
5606.7ms
V8 Score: 3139

--
a couple more comparison scores from the same machine:

Firefox 6
http://goo.gl/wg0u2
5584.9ms

Chrome16:
http://goo.gl/tF4tm
3550.1ms

Test runs weren't completely clean (a couple pinned tabs, didn't try a fresh profile yet etc.) but the result is consistent and nothing else is using CPU.

The machine is win7SP1x64 Intel i7 820QM 1.73GHz 8GB



Expected results:

Fast and awesome

Comment 1

[Boris Zbarsky [:bzbarsky]]

Does this profile have Firebug installed?

Comment 2

[davidtryse+bz]

Good catch Boris, yes firebug (1.8.4) was the problem. Here's the numbers with the extension disabled:

Firefox 9beta
http://goo.gl/6s5KW
3894.1ms
V8 Score: 5557

Firefox 8beta6
http://goo.gl/nXUpF
5699.3ms
V8 Score: 4113

Somehow firebug doesn't touch ffx8's kraken benchmark (though it does mess with the V8 score). For ffx9 it affects both (even with "deactivate for this site"). Anyway, not an issue with ffx itself it seems.

Comment 3

[Boris Zbarsky [:bzbarsky]]

OK, so you're running into bug 699528.  I'm just waiting on release driver approval to land it in 9.0.

Thank you for double-checking that and for filing the bug!