Hi Melwyn, On Fri, May 7, 2010 at 6:18 PM, Melwyn Lobo <[email protected]> wrote: > Hi , > I must say I was really impressed with performances of DirectFB when > compiling Qtopia 4.6.2 and using DirectFB as Gfx driver.... I tested this > release on our platform containing an SH4 processor and 2d blitter using > underlying hardware acclerated graphics functions in Directfb. The > performace gain for a sample QT application, "forever" (which blits random > rectangles on screen ASAP) was 10 times (302 rects/per sec) vis-vis simple > stock software QWS sans DirectFb (30 rects per sec). And even if I switch > off all accleration from DirectFB (DFBARGS=no-hardware), I managed to get 3 > times better performnace (90 rects per sec).
If I understand correctly , you should be using Sti7109 processor. Did you build 4.6.2 with the patches for 4.6.0(available in the SRPM of 4.6.0) Moreover, do you mind to share your build option? I am using 4.6.0 on 7105 , the performance over directfb is quite disappointed.. Thanks. > I would like to understand from DirectFB experts via these queries. > My queries: > 1. How would you explain this difference in performance, i.e. stock QWS > vis-a-vis QT over DirectFB (unaccelerated) > 2. For a UMA system with system memory acting as framebuffer, what are > benefits when choosing DSCAPS_VIDEO while creating a surface. Is this > surface present on the framebuffer or elsewhere? > 3. While blitting an updated rectangle, is there an implicit back buffer in > DirectFB where this rectangle is first copied before the entire surface is > blitted to the framebuffer. > 4. I did not use the fusion kernel module from DirectFB for running this QT > app. In which use case is it useful and what is its purpose? > Thanks so much!! > I would really appreciate any explanation/advice. > > Regards, > M. > > _______________________________________________ > directfb-users mailing list > [email protected] > http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-users > > _______________________________________________ directfb-users mailing list [email protected] http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-users
