rpcs3 SPU: Update CELL Communication Performance

Optimizations:

cellRtc functions were called non-stop by the PPU thread which use sys_memory_get_page_attribute internally. The writer lock in sys_memory_get_page_attribute was causing SPUs to wait unjustly.
Fast path without locking VM has been added to sys_rsx_context_iomap.
Exclude spu_thread::reservation_check address receptacle from writer_lock detection and waiting.
Fix spu_thread::reservation_check(hash) overload for main and stack memory.
Add fast path without checking allocation for spu_thread::reservation_check when the address is on the same page as GETLLAR's effective address.

Fixes https://github.com/RPCS3/rpcs3/issues/14724

Oct 31 '25 06:10 elad335

Added "SPURS oriented thread waiting" which is gonna replace "Preferred SPU Threads" setting and be active by default.

Nov 02 '25 07:11 elad335

Special settings tweaked from default:

Clocks Scale: 800% Vblank Frequency: 480Hz Frame Limit: Off Preferred SPU Threads: Auto (as default)

PR:

Master

Nov 02 '25 09:11 elad335

performance are regressed on some games such as KZ3

PR:

kz3_pr

MASTER:

kz3_master

Nov 02 '25 10:11 digant73

i9-13900K | RTX 3080 Ratchet & Clank Tools of Destruction - Improved a little bit. 88.3 -> 92.5 God of War 3 - Very small Regression. 62.4 -> 61.0 Sonic Unleashed - Tremendously reduced performance. From a stable 42.4 to very unstable 32.4

Ratchet & Clank

ratchet tod

God of War 3

gow3

Sonic Unleahsed

sonic u

Nov 02 '25 16:11 MsDarkLow

I've pushed an experimental update, please test. If it works I'll put it under a special setting.

Nov 06 '25 15:11 elad335

i9-13900K | RTX 3080 After these updates, all four games I've tested before have improved! Ratchet & Clank Tools of Destruction - 88.3 -> 96.0 (earlier in the pr was at 92.0) God of War 3 - 62.0 -> 64.0 (earlier in the pr it was 61.0) Sonic Unleashed - 42.4 -> 43.4 (earlier in the pr it was 32.4) Metal Gear Soils 4 - 95.4 -> 96.3

Ratchet & Clank

ratchet tod - pt2