Philippe Gerum wrote:
Never put X in the loop; results cannot be reliable with it and it makes no sense to interpret them since the user-space X driver can do whatever it wants to with your hadware, especially when switching back and forth vt7. So I cannot comment these figures.
May I make the same comment again, publicly this time : for me, one reason of using a RTAI implementation is having the normal linux environment including sophisticated X11/KDE, apps. Otherwyse, I would go for RTEMS or eCos.
So I think making benchmarks with X app running, is relevant (not obviously the vt switch). Also, for embeded application, using the framebuffer makes the X server behaves almost like any other linux driver. Furthermore, the X server indeed performs IO but do not handle interrupts directly. And if you use this argument, any user space drivers would also be removed and this includes USB drivers, ...
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