[mythtv-users] very low glxgears fps

James Warden warjamy at yahoo.com
Fri Mar 30 14:20:56 UTC 2007


I have an intel based laptop with an nvidia geforce 4200 go (an old timer by nowadays standards). I run debian sid on it. I use the binary driver from nvidia (version 9631). I had to disable agpgart from the kernel since I want to use the nvidia AGP option. The debian kernel had agpgart by default, which loaded the module intel_agp. That decreased the performance. Without those guys in the kernel, using the nvidia agp, I get around 4500 fps (my CPU is a 1.6 GHz pentium M) when I run X at 16bit color depth, and about 3000+ fps at 24bit. 
Don't be upset about the 99% CPU when running glxgears. I also get the same CPU load when running that little app. 

The first thing you want to check is if 'glxinfo' returns the following : Direct Rendering: Yes' (beware, glxinfo outputs a big load of stuff on the screen). If it is No, then you don't have 3D acc. Which makes me think that the 3D acc option enabled won't help you with HD or DVD playback, it will help you with opengl apps (3D games, modeling, etc, or even the mythtv opengl painter, which I gladly use on my frontend :). What you really want is video overlay (Xv), and possibly with motion compensation (XvMC). I don't think XvMC works with MPEG4, but is very useful with MPEG2 decoding. Some nvidia GPU are a bit tricky to set up for XvMC. The mythtv wiki has some info about nvidia and XvMC. I think that the 5200 is the best nvidia choice for that matter. So you should be in business if you get XvMC working. In a shell, you could try typing 'xvinfo' and see if you have an xvideo port available. If no, then you're in trouble.

J.

Bert Van Kets <mythtv-users at vankets.com> wrote: With hardware acceleration you should get over 1000 fps in glxgears. 
There is clearly something wrong with your video driver.
What distribution are you using? This info is absolutely necessary to be 
able to help you.
If you are running Fedora, do read this: 
http://fedorasolved.org/video-solutions/3rd-pty-video
You should not use the drivers provided by the manufacturers, but only 
use the ones provided by the Fedora or Livna repositories.

I had a similar situation where my nVidia drivers would not work on FC6. 
Even switching to an ATI card and installing only the Livna drivers did 
not solve the problem. I did not want to clean up FC6 manually, so I did 
a clean install and everything works fine now.

Bert

Gabe Rubin wrote:
> All,
>
> I have been trying to troubleshoot some video issues, and have gotten
> on the bandwagon of seeing what information can be gleamed from
> glxgears; it is not pretty:
> [mythtv at localhost ~]$ glxgears
> 633 frames in 5.0 seconds = 126.556 FPS
> 638 frames in 5.0 seconds = 127.449 FPS
> 637 frames in 5.0 seconds = 127.374 FPS
> 638 frames in 5.0 seconds = 127.422 FPS
> 628 frames in 5.0 seconds = 125.479 FPS
> 638 frames in 5.0 seconds = 127.414 FPS
> 634 frames in 5.0 seconds = 126.792 FPS
> 638 frames in 5.0 seconds = 127.421 FPS
>
> All the while, glxgears is chewing through 99% of my CPU according to top.
>
> What can I do to speed this up?  I understand that glxgears is not a
> perfect benchmark, but I would think that using that type of CPU
> power, an nother major processes running, I would get in the thousands
> of fps (and this is why I suspect I can't playback HD or even DVDs
> really for that matter).  Some other vitals on my system (using a
> geforce 5200 w/256 megs of memory; nforce chipset):
>
> [mythtv at localhost ~]$ cat /proc/driver/nvidia/agp/status
> Status:          Enabled
> Driver:          AGPGART
> AGP Rate:        8x
> Fast Writes:     Disabled
> SBA:             Enabled
>
> [mythtv at localhost ~]$ cat /proc/cpuinfo
> processor       : 0
> vendor_id       : AuthenticAMD
> cpu family      : 15
> model           : 12
> model name      : AMD Sempron(tm) Processor 3100+
> stepping        : 0
> cpu MHz         : 1800.000
> cache size      : 256 KB
> fdiv_bug        : no
> hlt_bug         : no
> f00f_bug        : no
> coma_bug        : no
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 1
> wp              : yes
> flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca
> cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext lm 3dnowext
> 3dnow ts fid vid ttp
> bogomips        : 3618.70
>
> [mythtv at localhost ~]$ cat /proc/meminfo
> MemTotal:       515440 kB
> MemFree:         19160 kB
> Buffers:         12208 kB
> Cached:         162444 kB
> SwapCached:          0 kB
> Active:         358180 kB
> Inactive:        81196 kB
> HighTotal:           0 kB
> HighFree:            0 kB
> LowTotal:       515440 kB
> LowFree:         19160 kB
> SwapTotal:     1052248 kB
> SwapFree:      1052248 kB
> Dirty:               8 kB
> Writeback:           0 kB
> AnonPages:      264744 kB
> Mapped:          40484 kB
> Slab:            34652 kB
> SReclaimable:     7020 kB
> SUnreclaim:      27632 kB
> PageTables:       2652 kB
> NFS_Unstable:        0 kB
> Bounce:              0 kB
> CommitLimit:   1309968 kB
> Committed_AS:   705496 kB
> VmallocTotal:   507896 kB
> VmallocUsed:     46796 kB
> VmallocChunk:   457716 kB
> HugePages_Total:     0
> HugePages_Free:      0
> HugePages_Rsvd:      0
> Hugepagesize:     4096 kB
>
>
> And my xorg.conf:
> # Xorg configuration created by system-config-display
>
> Section "ServerLayout"
>         Identifier     "single head configuration"
>         Screen      0  "Screen0" 0 0
>         InputDevice    "Mouse0" "CorePointer"
>         InputDevice    "Keyboard0" "CoreKeyboard"
> EndSection
>
> Section "Files"
>
> # RgbPath is the location of the RGB database.  Note, this is the name of the
> # file minus the extension (like ".txt" or ".db").  There is normally
> # no need to change the default.
> # Multiple FontPath entries are allowed (they are concatenated together)
> # By default, Red Hat 6.0 and later now use a font server independent of
> # the X server to render fonts.
>         ModulePath   "/usr/X11R6/lib/modules"
>         ModulePath   "/usr/X11R6/lib/modules/extensions"
>         ModulePath   "/usr/lib/xorg/modules/extensions/nvidia"
>         ModulePath   "/usr/X11R6/lib/modules/extensions/nvidia"
>         ModulePath   "/usr/lib/xorg/modules/extensions"
>         ModulePath   "/usr/lib/xorg/modules"
>         FontPath     "unix/:7100"
> EndSection
>
> Section "Module"
>         Load  "dbe"
>         Load  "extmod"
>         Load  "fbdevhw"
>         Load  "glx"
>         Load  "record"
>         Load  "freetype"
>         Load  "type1"
> EndSection
>
> Section "InputDevice"
>
> # Specify which keyboard LEDs can be user-controlled (eg, with xset(1))
> #       Option  "Xleds"         "1 2 3"
> # To disable the XKEYBOARD extension, uncomment XkbDisable.
> #       Option  "XkbDisable"
> # To customise the XKB settings to suit your keyboard, modify the
> # lines below (which are the defaults).  For example, for a non-U.S.
> # keyboard, you will probably want to use:
> #       Option  "XkbModel"      "pc102"
> # If you have a US Microsoft Natural keyboard, you can use:
> #       Option  "XkbModel"      "microsoft"
> #
> # Then to change the language, change the Layout setting.
> # For example, a german layout can be obtained with:
> #       Option  "XkbLayout"     "de"
> # or:
> #       Option  "XkbLayout"     "de"
> #       Option  "XkbVariant"    "nodeadkeys"
> #
> # If you'd like to switch the positions of your capslock and
> # control keys, use:
> #       Option  "XkbOptions"    "ctrl:swapcaps"
> # Or if you just want both to be control, use:
> #       Option  "XkbOptions"    "ctrl:nocaps"
> #
>         Identifier  "Keyboard0"
>         Driver      "kbd"
>         Option      "XkbModel" "pc105"
>         Option      "XkbLayout" "us"
> EndSection
>
> Section "InputDevice"
>         Identifier  "Mouse0"
>         Driver      "mouse"
>         Option      "Protocol" "IMPS/2"
>         Option      "Device" "/dev/null"
>         #Option     "Device" "/dev/input/mice"
>         Option      "ZAxisMapping" "4 5"
>         Option      "Emulate3Buttons" "yes"
> EndSection
>
> Section "Monitor"
>
> #       Option      "dpms" "off"
>  ### Comment all HorizSync and VertSync values to use DDC:
>  ### Comment all HorizSync and VertSync values to use DDC:
>  ### Comment all HorizSync and VertSync values to use DDC:
>         Identifier   "Monitor0"
>         VendorName   "Monitor Vendor"
>         ModelName    "Unknown monitor"
>  ### Comment all HorizSync and VertSync values to use DDC:
> #       HorizSync    31.5 - 37.9
> #       VertRefresh  50.0 - 70.0
>         Option      "UseEdidDpi" "TRUE"
>         Option      "DPI" "100 x 100"
>         Option      "DPMS" "off"
> EndSection
>
> Section "Device"
>         Identifier  "Videocard0"
>         Driver      "nvidia"
>         VendorName  "Videocard vendor"
>         BoardName   "NVIDIA GeForce FX (generic)"
>         Option      "XvmcUsesTextures" "false"
>         Option      "UseEvents"   "true"
>         #Option     "RandRRotation" "true"
>         Option      "AddARGBGLXVisuals" "True"
>         #Option      "NvAGP" "1"
> EndSection
>
> Section "Screen"
>         Identifier "Screen0"
>         Device     "Videocard0"
>         Monitor    "Monitor0"
>         DefaultDepth     24
>         Option      "UseEvents" "True"
> #       SubSection "Display"
> #               Viewport   0 0
> #               Depth     16
> #               Modes    "1024x768" "800x600" "640x480"
> #       EndSubSection
>         SubSection "Display"
>                 Viewport   0 0
>                 Depth     24
>                 Modes     "1280x720_60i" "1280x720_60" "800x600" "640x480"
>         EndSubSection
> EndSection
>
> Section "DRI"
>         Group        0
>         Mode         0666
> EndSection
>
>
> Thanks!
> _______________________________________________
> mythtv-users mailing list
> mythtv-users at mythtv.org
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>
>
>
>   

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