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-   -   Poor 2D Performance (http://www.nvnews.net/vbulletin/showthread.php?t=153577)

progger1986 07-30-10 06:20 AM

Poor 2D Performance
 
I have openSuse 11.3 and the NVIDIA 256.35 driver installed.
The 2D performance is very bad. Scrolling in Firefox ix very laggy. I even testet under icewm. So it is not a KDE/Qt problem).
With nouveau all is fine. But i'd like to use the nvidia drivers because it has (atm) the bedder 3D support.

Ulukai 07-30-10 06:44 AM

Re: Poor 2D Performance
 
Which card are you using?

It might be PowerMizer kicking in, lowering your clock speeds and thus poor scrolling performance. But when you're scrolling for a couple of seconds, it should go up again.

progger1986 07-30-10 07:40 AM

Re: Poor 2D Performance
 
I hava a 7300GT.

danix 07-30-10 03:01 PM

Re: Poor 2D Performance
 
Firefox sometimes allocates large pixmaps which exceed the hardware limitations of the GPU. These pixmaps have to be handled by a slow software fallback.

aorta 07-30-10 04:12 PM

Re: Poor 2D Performance
 
Quote:

Originally Posted by danix (Post 2295488)
Firefox sometimes allocates large pixmaps which exceed the hardware limitations of the GPU. These pixmaps have to be handled by a slow software fallback.

So why is performance so good with the nouveau or old nv driver?

Are they using a special hidden GPU?

mooninite 07-30-10 04:54 PM

Re: Poor 2D Performance
 
Quote:

Originally Posted by danix (Post 2295488)
Firefox sometimes allocates large pixmaps which exceed the hardware limitations of the GPU. These pixmaps have to be handled by a slow software fallback.

I don't pretend to be an X expert, but to my little programming mind it would make sense to break up a 'too large' piece into pieces the GPU can handle, either in GPU memory or in system memory, and allow the GPU to process it. Most likely how the open source driver gets away with it.

Of course that would allow older cards to continue to work without requiring someone to spend money on a new card.

progger1986 07-31-10 03:30 AM

Re: Poor 2D Performance
 
It is nopt just Firefox. The whole KDE4 Desktop is laggy with nvidia too.
The nouveau driver provides a much bedder desktop performance.

As far as i remember tha nvidia driver was faster in that cases.

mick232 07-31-10 12:13 PM

Re: Poor 2D Performance
 
Same here.

256.* drivers render the desktop almost unusably slow (AGAIN) on my GF 8200.

Nouveau works much faster but has some other issues (lock-ups, sometimes artefacts).

Older drivers aren't compatible with xorg 1.9.

konst 07-31-10 04:38 PM

Re: Poor 2D Performance
 
Quote:

Originally Posted by progger1986 (Post 2295751)
It is nopt just Firefox. The whole KDE4 Desktop is laggy with nvidia too.
The nouveau driver provides a much bedder desktop performance.

As far as i remember tha nvidia driver was faster in that cases.

You're right. The whole KDE4 experience under Nvidia drivers is literally torture. Slow and buggy. However for me the nouveau drivers can't handle dual-link DVI well yet.
I had to use the Nvidia drivers to initialize the card into dual-link mode and the switch the the nouveau drivers. The screen would get corrupted after a while.

Switching to Radeon HD 5850 soon. Don't know how they will behave under KDE4 but since they're open source people can work on them and fix the problems quickly.

Licaon 07-31-10 05:54 PM

Re: Poor 2D Performance
 
Quote:

Originally Posted by konst (Post 2295898)
You're right. The whole KDE4 experience under Nvidia drivers is literally torture. Slow and buggy.

ummm... on your Linux maybe

Quote:

Originally Posted by konst (Post 2295898)
Switching to Radeon HD 5850 soon. Don't know how they will behave under KDE4 but since they're open source people can work on them and fix the problems quickly.

open-source for 2D only, IIRC

konst 07-31-10 08:05 PM

Re: Poor 2D Performance
 
Quote:

Originally Posted by Licaon (Post 2295911)
ummm... on your Linux maybe

open-source for 2D only, IIRC

Open source for 2d AND 3d in the ATI open source drivers.

Licaon 07-31-10 08:16 PM

Re: Poor 2D Performance
 
Quote:

Originally Posted by konst (Post 2295959)
Open source for 2d AND 3d in the ATI open source drivers.

For HD5xxx series? Maybe in a year or so. :(


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