[Bug 34486] Poor xterm/exa perf with ColorTiling on.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=34486

--- Comment #4 from Alex Deucher <agd5f at yahoo.com> 2011-02-21 07:28:28 PST ---
(In reply to comment #2)
> 
> commit fccdca8db34010f566bd068c74cdef0f4a8cb7f5
> Author: Alex Deucher <alexdeucher at gmail.com>
> Date:   Wed Nov 17 17:37:25 2010 -0500
> 
>     radeon/kms: allow tiled front buffer on 6xx/7xx
> 
>     Use UTS/DFS to tile/untile as appropriate for sw access.
>     Also enables pageflipping with tiling enabled.

That commit enabled tiling and pageflipping to work together; both the front
and back buffers are tiled so pageflipping will work.  Prior to that, only the
back buffer was tiled.  However, since the front buffer is tiled, software
cannot access the front buffer directly; the hw needs to convert it to a linear
buffer first.  Unfortunately, there's not really a good fast way to support
software fallbacks and tiling.  Your best bet it to use a terminal or xterm
configuration that uses a hw path (e.g., don't use bitmap fonts).  See bug
30679.

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