buffer_cache: collect Switch 2 buffers from 512 MiB

The collector ran on Switch 2 titles only once their buffers reached
1 GiB (aggressively at 2 GiB), so geometry of scenes long gone stayed in
VRAM: Mario Kart World's title screen grew from 0.2 to 0.9 GB of buffers
in ten minutes, most of a ~1.4 GB climb in VRAM in use. It now starts at
512 MiB (aggressive at 1 GiB); it only evicts buffers unused for 120
frames or more.

(cherry picked from commit fb5d797636f2269591b68fda7c8d65787a9e3a9f)

1 files changed, 4 insertions, 3 deletions

diff --git a/src/video_core/buffer_cache/buffer_cache.h b/src/video_core/buffer_cache/buffer_cache.h
index e90af3214d..53874e75cc 100644
--- a/src/video_core/buffer_cache/buffer_cache.h
+++ b/src/video_core/buffer_cache/buffer_cache.h
@@ -141,9 +141,10 @@ void BufferCache<P>::TickFrame() {
         // title 1's buffers were ~200 MiB of an 8 GB GPU's ~6.8 GB in use, yet this collector
         // ran aggressively every frame on the device-wide figure, evicting up to 64 buffers (and
         // downloading the GPU-written ones, ~5% of the GPU thread) that were recreated later.
-        // Collect when the buffers themselves are large.
-        if (buffer_bytes >= 1_GiB) {
-            RunGarbageCollector(buffer_bytes >= 2_GiB);
+        // Collect when the buffers themselves are large. At 1 GiB it held geometry of scenes
+        // long gone: title 1's title screen grew to ~0.9 GB of buffers in ten minutes.
+        if (buffer_bytes >= 512_MiB) {
+            RunGarbageCollector(buffer_bytes >= 1_GiB);
         }
     } else if (total_used_memory >= minimum_memory) {
         RunGarbageCollector(total_used_memory >= critical_memory);