[Webkit-unassigned] [Bug 55440] improve layout performance by reducing the traversal time of the floating objects

Tue Mar 1 16:34:16 PST 2011

https://bugs.webkit.org/show_bug.cgi?id=55440

--- Comment #6 from Yuqiang Xian <yuqiang.xian at intel.com>  2011-03-01 16:34:16 PST ---
(In reply to comment #5)
> (In reply to comment #4)
> > (In reply to comment #3)
> > > Maybe I’m missing something, but how is going from 503s to 269s a 80~90% improvement?  That seems like a 45% improvement to me.
> > 
> > Sorry for confusing you but I think it depends on how we describe the speedup. Yes the time is reduced by 45%, but considering the speed it's a 80~90% improvement. Just like we see "2X speedup" more often than "50% improvement" when the time to complete a job is shortened from 2s to 1s.
> 
> The change from 269 to 503 is ~85%. The change from 503 to 269 is -45%.  It seems nonsensical to describe the speedup in terms of what regression it would take to get back to the original performance.

OK. Can we just say that the proposed patch reduces the time from 503s to 269s and not to stick to the debate of how speedup is calculated?
Back to the issue itself, can anybody help review if this is a issue that needs to be addressed, and if current quick fix reasonable to do? Also I'd appreciate any discussions on how we will do in long term to address the floating objects performance issue when the list becomes enormous like the one demonstrated in this Microsoft test case.

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