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Old 10-09-09, 09:15 AM   #1
Tonglebeqk
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Join Date: Jun 2008
Posts: 30
Default is this a common problem? (opengl)

Using KDE 4.3. If I run glxgears without compositing, I get ~17.4k FPS. When I enable compositing, glxgears stutters horribly, but says it goes at 5k FPS. Why is performance totally killed when compositing is enabled? I have an 896mb gtx260 which should be more than enough for this...here comes my xorg.conf if it makes any difference (also am using 190.36 drivers, but this issue has been with older drivers as well):

PHP Code:
aaron@h4x0r ~ $ cat /etc/X11/xorg.conf
Section
"ServerLayout"                
    
Identifier     "Layout0"          
    
Screen      0  "Screen0" 0 0      
EndSection                            

Section
"ServerFlags"
  
Option "DontZap" "off"
EndSection              

#Section "Monitor"
#   Identifier     "CRTMonitor"
#  VendorName     "Envision"   
# ModelName      "EFT720"      
#    HorizSync       30.0 - 72.0
#    VertRefresh     50.0 - 130.0

Section "Monitor"
    
Identifier "LCD"
    
VendorName "Samsung"
    
ModelName  "2232BW"
    
HorizSync 30.0 - 72.0
    VertRefresh  50.0
- 130
#    Option "Mode" "1680x1050"
#Option         "metamodes" "1680x1050_60 +0+0;
EndSection

Section
"Device"
    
Identifier     "NvidiaCard"
    
Driver         "nvidia"
    
VendorName     "NVIDIA Corporation"
    
Option "OnDemandVBlankInterrupts" "true"
    
Option "NoLogo" "TRUE"
    
Option "Coolbits" "1"
    
Option "CursorShadow" "true"
    
Option "CursorShadowXOffset" "10"
    
Option "CursorShadowYOffset" "10"
    
Option "AddARGBGLXVisuals" "true"
    
Option "MultisampleCompatibility" "true"
    
Option         "UseEvents" "false"
    
Option         "TripleBuffer" "1"
     
Option         "DamageEvents" "true"
    
Option         "InitializeWindowBackingPixmaps" "1"
    
Option         "PixmapCacheSize" "134217728"
EndSection

Section
"Screen"
    
Identifier     "Screen0"
    
Device         "NvidiaCard"
    
Monitor        "LCD"
    
DefaultDepth    24
    SubSection     
"Display"
       
Depth       24
    EndSubSection
EndSection

Section
"Extensions"
    
Option         "Composite" "Enable"
EndSection
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Old 10-09-09, 10:50 AM   #2
jumjum77
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Posts: 13
Default Re: is this a common problem? (opengl)

You can not measure performance with glxgears. The numbers mean nothing.
Use a benchmark or a game to compare the performance instead.
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Old 10-09-09, 11:08 AM   #3
Tonglebeqk
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Posts: 30
Default Re: is this a common problem? (opengl)

Ok. I ran the CS:S stress test. 84.99 w/o compositing, and 79.87 with. That's much more of what I'd expect.

So why does glxgears suck so much with compositing? Is it simply outdated or something? Just wondering.

Something else I noticed: w/o compositing enabled, smooth scrolling in firefox is great, but w/ compositing enabled, it is terrible. Is this a driver bug or a kde bug?
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Old 10-09-09, 11:14 AM   #4
castor
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Posts: 16
Default Re: is this a common problem? (opengl)

Quote:
Originally Posted by jumjum77 View Post
You can not measure performance with glxgears. The numbers mean nothing.
Use a benchmark or a game to compare the performance instead.
And this, also means nothing?
Quote:
glxgears stutters horribly
Sorry, but doesn't anyone else find it annoying, that every time someone mentions glxgears, the answer seems to suggest that glxgears has nothing to do with gfx cards at all?
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Old 10-09-09, 11:21 AM   #5
gbil
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Posts: 272
Default Re: is this a common problem? (opengl)

Quote:
Originally Posted by castor View Post

Sorry, but doesn't anyone else find it annoying, that every time someone mentions glxgears, the answer seems to suggest that glxgears has nothing to do with gfx cards at all?
I find it annoying when anyone refers to glxgears!
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Old 10-09-09, 11:27 AM   #6
jumjum77
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Default Re: is this a common problem? (opengl)

Quote:
Originally Posted by castor View Post
And this, also means nothing?

Sorry, but doesn't anyone else find it annoying, that every time someone mentions glxgears, the answer seems to suggest that glxgears has nothing to do with gfx cards at all?
Of course it means something.

You would have to be pretty creative to read that into my post.
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Old 10-09-09, 03:24 PM   #7
Dragoran
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Posts: 711
Default Re: is this a common problem? (opengl)

Quote:
Originally Posted by Tonglebeqk View Post
Ok. I ran the CS:S stress test. 84.99 w/o compositing, and 79.87 with. That's much more of what I'd expect.

So why does glxgears suck so much with compositing? Is it simply outdated or something? Just wondering.
Because it simply draws to many frames so that any slight overhead can have a massive effect like that.
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Old 10-09-09, 05:39 PM   #8
Tonglebeqk
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Posts: 30
Default Re: is this a common problem? (opengl)

Quote:
Originally Posted by Dragoran View Post
Because it simply draws to many frames so that any slight overhead can have a massive effect like that.
Ok, thanks for explaining that
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