high CPU consumption of X when running xinerama

[Frank Wittig]

Hi list!

I have a moderate equipped computer (celeron 2.4GHz / 512MB) which runs
Xinerama (a ATI Radeon 9100XI (onboard) an a Nvidia TNT2 (PCI)).
My Problem is that X is consuming most of my CPU time when the computer
is performing some task. E.g. Firefox is performing JavaScript,
GnomeTerminal is running cvs update via SSH or copying files over scp.
What makes me wonder is that not Firefox, scp or cvs is listet topmost
in top but X is. (load average >1 mostly arround 1.5 - system responds
slowly and "hangs")
I have 3 more of equal equipped computers (besides they have only one
display (onboard Radeon)) running arround here which don't have this
enormous load caused by X. (load average mostly < 0.5)


My xorg.conf is:

Section "ServerLayout"
        Identifier     "Multihead layout"
        Screen      0  "Screen0" RightOf "Screen1"
        Screen      1  "Screen1" 0 0
        InputDevice    "Mouse0" "CorePointer"
        InputDevice    "Keyboard0" "CoreKeyboard"
        Option         "Xinerama" "on"
        Option         "Clone" "off"
EndSection

Section "Files"
        RgbPath      "/usr/X11R6/lib/X11/rgb"
        ModulePath   "/usr/X11R6/lib/modules"
        FontPath     "/usr/X11R6/lib/X11/fonts/misc/"
        FontPath     "/usr/X11R6/lib/X11/fonts/TTF/"
        FontPath     "/usr/X11R6/lib/X11/fonts/Type1/"
        FontPath     "/usr/X11R6/lib/X11/fonts/CID/"
        FontPath     "/usr/X11R6/lib/X11/fonts/75dpi/"
        FontPath     "/usr/X11R6/lib/X11/fonts/100dpi/"
EndSection

Section "Module"
        Load  "vnc"
        Load  "dbe"
        Load  "extmod"
        Load  "fbdevhw"
        Load  "glx"
        Load  "record"
        Load  "xtrap"
        Load  "freetype"
        Load  "type1"
        Load  "dri"
EndSection

Section "InputDevice"
        Identifier  "Keyboard0"
        Driver      "kbd"
        Option      "XkbModel" "pc105"
        Option      "XkbLayout" "de"
        Option      "XkbVariant" "nodeadkeys"
EndSection

Section "InputDevice"
        Identifier  "Mouse0"
        Driver      "mouse"
        Option      "Protocol" "IMPS/2"
        Option      "Device" "/dev/input/mice"
        Option      "ZAxisMapping" "4 5"
        Option      "Emulate3Buttons" "yes"
EndSection

Section "Monitor"
        Identifier   "Monitor0"
        VendorName   "Monitor Vendor"
        ModelName    "B101715"
        DisplaySize  340        280
        HorizSync    31.0 - 83.0
        VertRefresh  56.0 - 75.0
        Option      "dpms"
EndSection

Section "Monitor"
        Identifier   "Monitor1"
        VendorName   "Monitor Vendor"
        ModelName    "Monitor 1280x1024"
        HorizSync    31.5 - 90.0
        VertRefresh  50.0 - 90.0
        Option      "dpms"
EndSection

Section "Device"
        Identifier  "Videocard0"
        Driver      "radeon"
        VendorName  "Videocard vendor"
        BoardName   "ATI Radeon 9100 IGP"
        BusID       "PCI:1:5:0"
EndSection

Section "Device"
        Identifier  "Videocard1"
        Driver      "nv"
        VendorName  "nVidia Corporation"
        BoardName   "NV5M64 [RIVA TNT2 Model 64/Model 64 Pro]"
        BusID       "PCI:2:14:0"
EndSection

Section "Screen"
        Identifier "Screen0"
        Device     "Videocard0"
        Monitor    "Monitor0"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     16
                Modes    "1280x1024" "1280x960" "1152x864" "1024x768"
"800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     24
                Modes    "1280x1024" "1152x864" "1024x768" "800x600"
"640x480"
        EndSubSection
EndSection

Section "Screen"
        Identifier "Screen1"
        Device     "Videocard1"
        Monitor    "Monitor1"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     24
                Modes    "1280x1024" "1152x864" "1024x768" "800x600"
"640x480"
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     24
                Modes    "1280x1024" "1152x864" "1024x768" "800x600"
"640x480"
        EndSubSection
EndSection

Section "DRI"
        Group        0
        Mode         0666
EndSection
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