EXA classic problem with Xv

[Maarten Maathuis]

2010/6/10 Maarten Maathuis <madman2003 at gmail.com>:
> On Thu, Jun 10, 2010 at 8:56 PM, Corbin Simpson
> <mostawesomedude at gmail.com> wrote:
>> 2010/6/10 Yves De Muyter <yves at alfavisio.be>:
>>> Is there any documentation available about the differences between
>>> exa_mixed and exa_driver ? Is exa_driver like complete handover of
>>> pixmap migration to the driver ?
>>
>> The three flavors:
>> ~ Classic. EXA handles offscreen pixmaps itself. Simple, except when it breaks.
>> ~ Driver. EXA lets the driver control pixmap allocation and placement.
>> Great if you have a memory manager.
>> ~ Mixed. Like driver, but certain things have been tweaked to optimize
>> certain kinds of acceleration in a way that was never really explained
>> to me.
>
> mixed has parts from classic that avoid touching driver pixmaps
> directly for fallbacks (vram is slow to access from the cpu). Xorg's
> unique access patterns are not well suited to modern gpu's IMO. That's
> why mixed was made. Mixed would be useless if our world was 100% gpu
> accelerated, but unfortunately it's not.
>
> For mixed you can also fail prepare access on the frontbuffer, which
> allows you to make a driver that doesn't allow mapping of vram,
> provided you have a UTS and DFS hook that always works.
>
> For igp'ish hardware without dedicated memory and a decent memory
> manager, exa driver is preferred because it's the simplest driver mode
> and avoids overhead that is unneeded for such hardware.

That should read: and with a decent memory manager

>
>>
>> To go from driver to mixed is pretty simple; here's an example commit:
>> http://cgit.freedesktop.org/xorg/driver/xf86-video-ati/commit/?id=577ff3ce922e457cc32f80d4365cb1da81552e72
>>
>> ~ C.
>>
>> --
>> When the facts change, I change my mind. What do you do, sir? ~ Keynes
>>
>> Corbin Simpson
>> <MostAwesomeDude at gmail.com>
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>
>
>
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>



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Life spent, a precious moment, in the wink of an eye we live and we die.