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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: mlelstv%serpens.de@localhost (Michael van Elst)
Subject: Re: kern/51997: X display is really slow
Date: Thu, 23 Feb 2017 21:41:23 +0000 (UTC)
martin%netbsd.org@localhost (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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