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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #1 from Chris Wilson <chris at chris-wilson.co.uk> ---
intel-virtual-output -v will give you a lot of output about what it is doing,
including the copying from one screen to another and importantly the method.
Ideally we could share a buffer between Intel and Nvidia so that all copies are
performed by the GPU. On the Intel side, this is easy to setup (and should
already be) but I've not spent much time trying to find a way to do zero-copy
transfer to nvidia.

Start by confirming it is the copy that is rate-limiting, that should be clear
from the log and if you feel confident have a look through the code and see
what improvements you can make. (Or offer a few pointers.)

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