[Bug 76271] intel-virtual-output: one remote head fails to update

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76271

--- Comment #15 from Chris Wilson <chris at chris-wilson.co.uk> ---
Make sure you undo the DBG, then tell me what "top" and "perf top" look like.
At this point, it is more than likely that the pixel transfer is significant.
If it is the pixel transfer, you can try:

diff --git a/tools/virtual.c b/tools/virtual.c
index df92516..e0ecdae 100644
--- a/tools/virtual.c
+++ b/tools/virtual.c
@@ -74,6 +74,7 @@
 #endif

 #define FORCE_FULL_REDRAW 0
+#define FORCE_16BIT_XFER 1

 struct display {
        Display *dpy;
@@ -1462,7 +1463,7 @@ static int clone_output_init(struct clone *clone, struct
output *output,
        DBG(("%s-%s use shm? %d (use shm pixmap? %d)\n",
             DisplayString(dpy), name, display->has_shm,
display->has_shm_pixmap));

-       depth = output->use_shm ? display->depth : 16;
+       depth = output->use_shm && !FORCE_16BIT_XFER ? display->depth : 16;
        if (depth < clone->depth)
                clone->depth = depth;

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