Re: [gentoo-user] Xorg 7.0+composite+radeon OSS drivers+radeon9200se : X cpu usage sometimes rockets to > 80%

["b.n." <brullonulla@gmail.com>]

Alan McKinnon ha scritto:
> On Tuesday 10 October 2006 01:11, b.n. wrote:
>> I should be using a fully hw-accelerated Xorg, however. I have an ATI
>> Radeon 9200se card with the following options:
> 
> I have the same card, but I don't have the problems you are having
>> [...]
>> Section "Device"
>>
>>      #VideoRam    131072
>>      # Insert Clocks lines here if appropriate
>>          Identifier  "** ATI Radeon (generic)               [radeon]"
>>          Driver      "radeon"
> 
> That's the open source driver, you get 2D acceleration, but not 3D. 
> For 3D you need to emerge ati-drivers and use the fglrx driver
> 

Does Composite require full 3D acceleration? I don't think so.
The "radeon" OSS drivers allow for basic 3D (yes, quite suboptimal, but 
enough for my purposes)

The wiki says that for the ATI 9200 the "radeon" driver should allow a 
good composite experience:
"You can get hardware accelled Render (EXA) for 9200 and below, using 
X.org 7.0 driver 'radeon', thus making Composite ridiculously fast and 
even overcome NVidia cards, since they don't support EXA yet."

In fact, once tweaking xorg.conf for performance, composite works fast 
and quite well, apart from the occasional xorg CPU problem of my 
original mail. It seems more like a bug, however.

> My experiences were that composite with the radeon driver were ... poor

I guess it depends from your card. ATI cards below 9200 are much better 
supported by "radeon" than newer cards. Until I can, I would prefer to 
stick with the OSS drivers.

m.
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