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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BDW] Screen stop at certain frame when running Synmark2 cases while FPS is updating"
href="https://bugs.freedesktop.org/show_bug.cgi?id=84958#c11">Comment # 11</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [BDW] Screen stop at certain frame when running Synmark2 cases while FPS is updating"
href="https://bugs.freedesktop.org/show_bug.cgi?id=84958">bug 84958</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>Hmm, VF instancing is the key. Apparently the command to disable instancing
with VF_SGVS is by itself insufficient:
diff --git a/src/sna/gen8_render.c b/src/sna/gen8_render.c
index 9187b38..06cb736 100644
--- a/src/sna/gen8_render.c
+++ b/src/sna/gen8_render.c
@@ -805,6 +805,7 @@ gen8_emit_cc_invariant(struct sna *sna)
static void
gen8_emit_vf_invariant(struct sna *sna)
{
+ int n;
#if 1
OUT_BATCH(GEN8_3DSTATE_VF | (2 - 2));
OUT_BATCH(0);
@@ -818,6 +819,12 @@ gen8_emit_vf_invariant(struct sna *sna)
OUT_BATCH(GEN8_3DSTATE_VF_STATISTICS | 0);
+ for (n = 0; n < 33; n++) {
+ OUT_BATCH(GEN8_3DSTATE_VF_INSTANCING | (3 - 2));
+ OUT_BATCH(n);
+ OUT_BATCH(0);
+ }
+</pre>
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