Hello,
I am trying to improve the rendering speed of web-pages using webkit with gtk-x11 backend. In order to make use of the acceleration provided by EXA, i have hooked the solid, copy and composite hooks provided by EXA with my hardware implementation. And when i tested the performance using some X11 application that creates a simple pixmap and copies it to a window multiple times using XCopyArea(), then the performance gain is quite good. I have got 6-8x performance gain. When we consider the web-page scrolling scenario, i guess it also must be making a call to XCopyArea() only finally to bitblit the entire window contents during scrolling. But when i test the performance using some auto scrolling webpage on my web-browser app, if EXA is enabled its getting worse. According to my observation, if the pixmap migration is explicitly made OFF, then the performance is at par with that of EXA-Disabled case. This suggests that during the cases in which EXA fallbacks, most of the time consumed in system to video memory copy is killing the performance. My question is, Is EXA really provides some performance gain in cases like web-page rendering?? If yes, am i missing on some implementation part?? Can the migration mechanism of EXA be improved to suit the web-page rendering scenarios?? What kind of practical applications are considered to be improved by EXA??
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