[Bug 96820] intel-virtual-output: bad performance

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96820

--- Comment #4 from main.haarp at gmail.com ---
Created attachment 125003
  --> https://bugs.freedesktop.org/attachment.cgi?id=125003&action=edit
ivo log without Xfwm4's compositor

Hey,

thanks for your response. It appears that Xfwm4's compositor was responsible
for damaging the entire framebuffer on every frame. Disabling it improves
performance a bit.

If nothing is going on, the mouse is now smooth. However if there is movement
(e.g. a movie playing), the mouse becomes laggy again and CPU usage rises yet
again. So disabling the compositor did not really improve the underlying
problem.


So, if I'm interpreting things correctly, it's mostly a problem of copying
frames from the Nvidia X to Intel X, correct? What exactly is the bottleneck?
CPU, memory bandwidth, PCIe bandwidth?

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