[Bug 97299] Lag on terminal with compositing after 1f6dfc9

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97299

--- Comment #6 from Chris Wilson <chris at chris-wilson.co.uk> ---
Yup, in mesa/dri3 there is no synchronisation yet.... It needs something like

diff --git a/src/loader/loader_dri3_helper.c b/src/loader/loader_dri3_helper.c
index 2f09431..3315828 100644
--- a/src/loader/loader_dri3_helper.c
+++ b/src/loader/loader_dri3_helper.c
@@ -554,8 +554,17 @@ loader_dri3_wait_x(struct loader_dri3_drawable *draw)
    struct loader_dri3_buffer *front;
    __DRIcontext *dri_context;

-   if (draw == NULL || !draw->have_fake_front)
+   if (draw == NULL)
+      return;
+
+   if (!draw->have_fake_front) {
+      struct loader_dri3_buffer *back = dri3_back_buffer(draw);
+
+      dri3_fence_reset(draw->conn, back);
+      dri3_fence_trigger(draw->conn, back);
+      dri3_fence_await(draw->conn, back);
       return;
+   }

    front = dri3_fake_front_buffer(draw);
    dri_context = draw->vtable->get_dri_context(draw);

to flesh out glXWaitX().

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