This is the application gtkperf (http://gtkperf.sourceforge.net/ ) running through ebrainpool. Its a good way to understand where the display (Xorg) fits into this mix. Here the app is actually running my machine (supernova) which has the Intel x3100 graphics card and is being also run simultaneously from my machine, through ebrainpool on a machine with an ATI radeon. The pics below are shots taken out which show the results (yeah we know, bad video... sorry about that)
Notice in particular the times taken, rather the difference between the two. Keep in mind here this is the Same application, running of ONE machine, the same machine. It is installed on mine (intel x3100 graphics - 29 seconds) and the other machine running this very same installation of gtkperf of my machine, but via X, rendering it on another machine (ATI radeon graphics - 16 seconds). The Cpu being used in both cases is really mine, the graphics cards is the only difference.
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Difference between Xorg and VNC
Submitted by jeetu on
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This shows a key difference between Xorg and VNC. Whereas with VNC the screen pixels are first read and sent across the network and displayed back on the screen. Xorg works by sending out only critical information/meta-data so that the X Server with the display can then actually render this image. As far as possible it doesn't transfer actual bitmaps of pixels. Therefore rendering can take better advantage of the hardware on the device the display is connected to.
In this case, the program is running on a laptop with lower graphics but since it's being rendered by Xorg on my laptop with the ATI Radeon, Xorg utilizes the graphics capabilities of this card better and thus you see the difference.
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