[webkit-qt] [Qt] Strong performance degradation with DirectFB since r122720

[Brianceau, Julien]

Thanks a lot.

If you need any help from me (create bug in bugs.webkit.org, create patch etc ...) please feel free to ask,

Cheers,

Julien

-----Message d'origine-----
De : webkit-qt-bounces at lists.webkit.org [mailto:webkit-qt-bounces at lists.webkit.org] De la part de Zoltan Horvath
Envoyé : vendredi 14 septembre 2012 16:25
À : webkit-qt at lists.webkit.org; jocelyn.turcotte at nokia.com
Objet : Re: [webkit-qt] [Qt] Strong performance degradation with DirectFB since r122720



Okay, then it seems reasonable to roll it out, so I'm going to revert it
next week.

Zoltan

On Fri, 14 Sep 2012 16:12:00 +0200, <jocelyn.turcotte at nokia.com> wrote:

> Forget my last comment, this seems to be directly related to the use of
> QImage instead of QPixmaps.
>
> The directfb platform plugin uses QBlitterPaintEngine which handles
> drawPixmap in QDirectFbBlitter::drawPixmap rather than using straight
> CPU raster for drawImage.
>
> ________________________________________
> From: webkit-qt-bounces at lists.webkit.org
> [webkit-qt-bounces at lists.webkit.org] on behalf of Turcotte Jocelyn
> (Nokia-MP/Oslo)
> Sent: Friday, September 14, 2012 3:53 PM
> To: zoltan at webkit.org; webkit-qt at lists.webkit.org
> Subject: Re: [webkit-qt] [Qt] Strong performance degradation with
> DirectFB since r122720
>
> Ahh it's a canvas test, this might also be related to the deep-copy
> protection that was removed in the patch, when a QPainter is beginning
> on an existing image.
>
> ________________________________________
> From: webkit-qt-bounces at lists.webkit.org
> [webkit-qt-bounces at lists.webkit.org] on behalf of Turcotte Jocelyn
> (Nokia-MP/Oslo)
> Sent: Friday, September 14, 2012 3:35 PM
> To: zoltan at webkit.org; webkit-qt at lists.webkit.org
> Subject: Re: [webkit-qt] [Qt] Strong performance degradation with
> DirectFB since r122720
>
> Why was it necessary to switch from QPixmap to QImage?
>
> I don't think that this can be solved on the Qt side, it's a design
> advantage that QPixmap has in this kind of situations.
> As far as I know this might be mostly related to reusing a graphics
> buffer that already has been uploaded to graphics memory.
>
> Jocelyn
>
> ________________________________________
> From: webkit-qt-bounces at lists.webkit.org
> [webkit-qt-bounces at lists.webkit.org] on behalf of ext Zoltan Horvath
> [zoltan at webkit.org]
> Sent: Friday, September 14, 2012 3:17 PM
> To: webkit-qt at lists.webkit.org
> Subject: Re: [webkit-qt] [Qt] Strong performance degradation with
> DirectFB since r122720
>
> Hi there,
>
> Shouldn't we report this on Qt-side instead?
>
> Cheers,
> Zoltan
>
>
> On Fri, 14 Sep 2012 15:02:13 +0200, Allan Sandfeld Jensen
> <kde at carewolf.com> wrote:
>
>> On Friday 14 September 2012, Brianceau, Julien wrote:
>>> With r126284 based webkit version, I get 11,3 displayed fps, with a CPU
>>> usage of more than 95% With r126284 based webkit version with changeset
>>> 122720 reverted, I get 25,6 displayed fps, with a CPU usage of about
>>> 90%
>>>
>> Yes with a 50% speed regression also on Qt5, I think we need to revert
>> the
>> patch in trunk, otherwise I would have suggested only reverting it in
>> QtWebKit
>> 2.3. But having as few difference as possible is better, so I am
>> actually
>> relieved it was also slower in Qt5.
>>
>> Cheers
>> `Allan
>> _______________________________________________
>> webkit-qt mailing list
>> webkit-qt at lists.webkit.org
>> http://lists.webkit.org/mailman/listinfo/webkit-qt
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