Go Back   nV News Forums > Linux Support Forums > NVIDIA Linux

Newegg Daily Deals

Reply
 
Thread Tools
Old 02-09-04, 02:57 PM   #1
secretfire
Registered User
 
Join Date: Feb 2004
Posts: 4
Default AGP + PCI Xinerama = POOR performance, definitive thread

After heavy experimentation and scouring this forum, e.g.:

http://www.nvnews.net/vbulletin/show...threadid=24277

http://www.nvnews.net/vbulletin/show...threadid=24212

http://www.nvnews.net/vbulletin/show...threadid=23849

I have concluded that there is something wrong with the nVidia driver that results in horrible 2D performance when using multiple video cards with multiple screens in a Xinerama configuration.

In my case, I have AGP FX5200 128MB and PCI FX5200 128MB video cards, each with two video outputs, for a total of four video outputs (four "Screens" in one sense of that ambiguous word). They are connected by analog VGA connection to four flat panel displays arranged horizontally in one row. The goal is to use Xinerama for one large desktop that spans the four monitors. (Hence, TwinView is not a factor.)

I have no problem getting the setup to work, except that on all of the screens the 2D performance is, as others have characterized it, "like molasses". For example, if I scroll a simple web page in Mozilla (this is Red Hat 9.0) it takes 1-5 seconds for the web page to render correctly. If I move a largish window around, either within one monitor or across monitors, it takes several seconds to repaint the screen. In both of these cases the CPU usage of the process named 'X' (the X server) jumps up to 99% for extended periods of time. (I have a 3GHz P4 on Intel 875 motherboard.)

I have another system with the same configuration except that the AGP card is a Matrox G450, and the performance on this system, while not amazing, is much better, even tolerable.

So, it looks like there is simply something wrong with the nVidia driver for this configuration. If I disable Xinerama, then suddenly all four screens run like one would expect this hardware to run; unfortunately, I need the functionality of Xinerama.

What do I want from you, valued forum participants? Any stories that confirm my conclusions, or that contradict them; any word from an nVidia representative that this is a known problem or is being addressed; any possible solutions besides replacing the nVidia AGP with the Matrox AGP; in short, am I right? And can anything be done about this?

Thanks.

p.s. I have not yet tried compiling a 2.6 kernel for this system, I am planning to do that soon. Any idea if this is likely to help?
secretfire is offline   Reply With Quote
Old 02-11-04, 12:52 PM   #2
secretfire
Registered User
 
Join Date: Feb 2004
Posts: 4
Default Does anybody use 4 heads with 2 nVidia cards?

Has anyone gotten nice performance on the desktop using a Xineramic configuration of four heads, with one AGP and one PCI video card? Did you have to do anything special in your XF86Config?

Why does mine run so slow?
secretfire is offline   Reply With Quote
Old 05-14-04, 02:01 PM   #3
surfed
Registered User
 
Join Date: May 2004
Posts: 7
Default Re: AGP + PCI Xinerama = POOR performance, definitive thread

Similar issue here but with 2cards (5200 agp + pci) and 2 monitors. In Xinerama both cards perform bad, with xinerama disabled i get good (not perfect) agp performance but still crapy pci performance (2D). Funny egnoth glx-gears gives me better performance on the pci card, but thats mainly for the reason of faster mem speed on that card.
Using 2.6.6 kernel. 5336 nv drivers, nforce 2 mb, 2.6AthlonXP....
sigh...
surfed is offline   Reply With Quote
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


Similar Threads
Thread Thread Starter Forum Replies Last Post
X Failed to load NVdriver c00lr4c3r NVIDIA Linux 13 10-22-02 01:44 PM
Need help to get the X to work on my Acer TravelMate 630 knchee NVIDIA Linux 16 09-19-02 10:16 PM
Gainward GeForce4 Ti 4200 and overclocked AGP Prefect47 NVIDIA GeForce 7, 8, And 9 Series 6 09-16-02 03:50 PM

All times are GMT -5. The time now is 06:00 AM.


Powered by vBulletin® Version 3.7.1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright 1998 - 2014, nV News.