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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #8 from Chris Wilson <chris at chris-wilson.co.uk> ---
Hmm. That *should* do an explicit flush of X rendering before reading from
those surfaces.

We can't use xtrace because of DRI3 (so we can't confirm if comptom/mesa is
signaling the flush) and in the ddx it is hard to identify who calls the
sync-flush as it is called very regularly.

So printf debugging! First can you please confirm we are hitting the new code
in mesa?

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