[Bug 110214] radeonsi: xterm scrollback buffer disappears while Shift+PgUp and PgDn

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110214

--- Comment #71 from Marek Olšák <maraeo at gmail.com> ---
(In reply to Michel Dänzer from comment #69)
> (In reply to Marek Olšák from comment #67)
> > Primitives aren't reordered with DPBB. Primitives can't also survive a
> > barrier with DPBB. DPBB has no effect on behavior, it just changes how PS
> > wavefronts are formed.
> 
> Is there any way that could affect the glamor shader which samples from one
> area of a buffer and draws to another (non-overlapping) area of the same
> buffer?

As long as the blits are truly non-overlapping, DPBB doesn't affect it.

> 
> What is the reason for radeonsi disabling DPBB for blits?

because it's not useful for blits and it might add latency because of binning.

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