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Re: kern/51997: X display is really slow

The following reply was made to PR kern/51997; it has been noted by GNATS.

From: (Michael van Elst)
Subject: Re: kern/51997: X display is really slow
Date: Thu, 23 Feb 2017 21:41:23 +0000 (UTC) (Martin Husemann) writes:
 > Sync time adjustment is 9.5675 msecs.
 > Something wrong with the retrace interrupt?
      * Some graphics hardware allows the server to claim it is done,
      * while in reality the hardware is busily working away.  So fetch
      * a pixel from the drawable that was drawn to, which should be
      * enough to make the server wait for the graphics hardware.
 Sync time is the measurement for this, basically the latency between
 calling a graphics operation and being able to retrieve the changed pixels.
                                 Michael van Elst
                                 "A potential Snark may lurk in every tree."

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