Mesa (master): i965: Maxinum the usage of urb space on SNB.

[Nan hai Zou]

Module: Mesa
Branch: master
Commit: f1824905faad6831edee6cf35cb8fa389ef3852a
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=f1824905faad6831edee6cf35cb8fa389ef3852a

Author: Zou Nan hai <nanhai.zou at intel.com>
Date:   Wed Mar  2 14:23:17 2011 +0800

i965: Maxinum the usage of urb space on SNB.
      SNB has 64k urb space, we only use piece of them.
      The more urb space we alloc,
      the more concurrent vs threads we can run.
      push the urb space usage to the limit.

Signed-off-by: Zou Nan hai <nanhai.zou at intel.com>

---

 src/mesa/drivers/dri/i965/gen6_urb.c |   16 ++++++----------
 1 files changed, 6 insertions(+), 10 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/gen6_urb.c b/src/mesa/drivers/dri/i965/gen6_urb.c
index fc46c4c..57be50a 100644
--- a/src/mesa/drivers/dri/i965/gen6_urb.c
+++ b/src/mesa/drivers/dri/i965/gen6_urb.c
@@ -34,19 +34,15 @@
 static void
 prepare_urb( struct brw_context *brw )
 {
-   brw->urb.nr_vs_entries = 24;
-   if (brw->gs.prog_bo)
-      brw->urb.nr_gs_entries = 4;
-   else
-      brw->urb.nr_gs_entries = 0;
+   brw->urb.nr_vs_entries = 256;
+   brw->urb.nr_gs_entries = 256;
+
    /* CACHE_NEW_VS_PROG */
    brw->urb.vs_size = MAX2(brw->vs.prog_data->urb_entry_size, 1);
 
-   /* Check that the number of URB rows (8 floats each) allocated is less
-    * than the URB space.
-    */
-   assert((brw->urb.nr_vs_entries +
-	   brw->urb.nr_gs_entries) * brw->urb.vs_size * 8 < 64 * 1024);
+   if (256 * brw->urb.vs_size > 64 * 1024)
+	   brw->urb.nr_vs_entries = brw->urb.nr_gs_entries = 
+		(64 * 1024 ) / brw->urb.vs_size;
 }
 
 static void