[Bug 88227] Radeonsi: High GTT usage in Prison Architect large map

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88227

--- Comment #11 from James Harvey <lothmordor at gmail.com> ---
Hello Marek,

My memory info:
[    1.879493] [drm] radeon: 2048M of VRAM memory ready
[    1.879494] [drm] radeon: 2048M of GTT memory ready.

I also have 8gb of system memory. I patched radeon_drm_winsys.c as per your
suggestion. This seemed to work well:

- (ws->info.vram_size + ws->info.gart_size) / 8);
+ (ws->info.vram_size + ws->info.gart_size) / 2);

I tried changing the divisor to 4, but that didn't help much.
Divisor at 3 was better but still had some fps drops to zero and trouble
getting above about 40fps.
Divisor at 2 was much better, fps drops only when waiting for data to load in
memory. (such as suddenly zooming out or saving/loading game).

While testing, the maximum GTT usage I saw was 1.82gb, with typical usage
around 1-1.5gb depending on how closely the map was zoomed in. Vram usage is
pretty flat, usually around 450mb.

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