i965/gen7: Increase the WM threads to hardware limits.

This thread count is only supposed to be enabled when "WIZ Hashing Disable in
GT_MODE register enabled."  I've always been confused whether that means the
bit in the register should be 1 or 0.  For my IVB GT2's register 0x7008 value
of 0x0, this appears to work fine.

Improves l4d2 performance at 640x480 by 0.88 +/- 0.11% (n=88).  Improves
performance with rasterization at 1280x1024 by 1.45% +/- 0.36% (n=6).

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

diff --git a/src/mesa/drivers/dri/i965/brw_context.c b/src/mesa/drivers/dri/i965/brw_context.c
index f5c8b6eea6d14030d23412ba09dcf8b93963449f..5a109e30430d1a87e333bd7ce0e99611c895ca5f 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_context.c
+++ b/src/mesa/drivers/dri/i965/brw_context.c
@@ -248,7 +248,7 @@ brwCreateContext(int api,
         brw->urb.max_vs_entries = 512;
         brw->urb.max_gs_entries = 192;
       } else if (intel->gt == 2) {
-        brw->max_wm_threads = 86;
+        brw->max_wm_threads = 172;
         brw->max_vs_threads = 128;
         brw->max_gs_threads = 128;
         brw->urb.size = 256;