[Bug 90112] [BSW Bisected] lightsmark performance decreased by 15%-20%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90112

--- Comment #7 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Chris Wilson from comment #6)
> Created attachment 115243 [details] [review]
> Use coarse throttling first
> 
> This patch should work around the change in behaviour for very, very slow
> render clients. But it would be more interesting to measure the impact of
> the libdrm patch first.

Also requires

diff --git a/src/mesa/drivers/dri/i965/intel_screen.c
b/src/mesa/drivers/dri/i965/intel_screen.c
index 5a9207a..4dc54e5 100644
--- a/src/mesa/drivers/dri/i965/intel_screen.c
+++ b/src/mesa/drivers/dri/i965/intel_screen.c
@@ -174,8 +174,10 @@ intel_dri2_flush_with_flags(__DRIcontext *cPriv,
    if (flags & __DRI2_FLUSH_DRAWABLE)
       intel_resolve_for_dri2_flush(brw, dPriv);

-   if (reason == __DRI2_THROTTLE_SWAPBUFFER)
+   if (reason == __DRI2_THROTTLE_SWAPBUFFER) {
+      brw->need_flush_throttle = true;
       brw->need_swap_throttle = true;
+   }
    if (reason == __DRI2_THROTTLE_FLUSHFRONT)
       brw->need_flush_throttle = true;

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