[Nouveau] [Bug 93254] [NVA5] The Long Dark (game) is very slow because of "kernel rejected pushbuf" messages in log files

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93254

--- Comment #4 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Interesting... so this may actually be a legit situation of "gpu not processing
pushbufs fast enough" and we run out of IB space. For some reason each pushbuf
has a very small quantity of commands... oh, I see. It's just a ton of
small-ish indexed draws, each of which ends up going through
nouveau_pushbuf_data() which in turn causes a new IB slot to be used up.

We need to have some way to figure out how many IB slots are open... or
throttle pushbuf submission or... something.

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