[mythtv-users] HDTV, NVidia & high CPU during playback : possible solution

[Steven Adeff]

On 11/1/06, Ackster <ackster at gmail.com> wrote:
> First, the scenario:
>
>     Ever since upgrading my Gentoo MythTV (Athlon64 3500+, 6600GT)
> system from scratch, I have had problems with high CPU load at times
> during HD playback, using x11-drivers/nvidia-drivers-1.0.8776 , for
> reference.  Quit annoying to have stutters.  So I started doing some
> digging, and saw references to Vertical Sync.   The X11 mode I'm using
> is running at 1760x960 for the best fit so far.
>
>
> Next, the solution (for me at least) :
>
> I emerged nvidia-settings, and uncheck the sync option (or at least it
> appears I did), so now I issue the following in my .xinitrc :
>
> '/usr/bin/nvidia-settings --load-config-only'
>
>
> This loads my <HOME>/.nvidia-settings-rc file, show next:
>
> cat .nvidia-settings-rc
> # ConfigProperties:
>
> ToolTips = Yes
> DisplayStatusBar = Yes
> SliderTextEntries = Yes
> IncludeDisplayNameInConfigFile = No
> ShowQuitDialog = Yes
>
> # Attributes:
>
> 0/DigitalVibrance[CRT-0]=0
> 0/ImageSharpening[CRT-0]=0
> 0/SyncToVBlank=0
> 0/AllowFlipping=1
> 0/LogAniso=0
> 0/FSAA=0
> 0/TextureSharpen=0
> 0/ForceGenericCpu=0
> 0/CursorShadow=0
> 0/CursorShadowXOffset=4
> 0/CursorShadowYOffset=2
> 0/CursorShadowAlpha=64
> 0/CursorShadowRed=0
> 0/CursorShadowGreen=0
> 0/CursorShadowBlue=0
> 0/FSAAAppControlled=1
> 0/LogAnisoAppControlled=1
> 0/RedBrightness=0.000000
> 0/GreenBrightness=0.000000
> 0/BlueBrightness=0.000000
> 0/RedContrast=0.000000
> 0/GreenContrast=0.000000
> 0/BlueContrast=0.000000
> 0/RedGamma=1.000000
> 0/GreenGamma=1.000000
> 0/BlueGamma=1.000000
> 0/OpenGLImageSettings=1
> 0/XVideoTextureSyncToVBlank=0
> 0/XVideoBlitterSyncToVBlank=0
> 0/XVideoSyncToDisplay=1
>
>
> This made a dramatic improvement on CPU performance, but I did notice
> sync problems.
>
>
> I then turned on "Enable OpenGL vertical sync for timing" in MythTV ,
> and the max CPU I have now is 36% when using Kernel Deinterlacing.  My
> sync was once again fine.
>
> Next, I turned back on 'RenderAccel' in /etc/X11/xorg.conf :
>
> Option "RenderAccel"             "true"
>
> And now CPU peaks at 33%.
>
> Hope this helps some people.  Nvidia drivers continue to impress me with
> the woes they have given me.  Maybe one day I'll actually be able to use
> the "HD1080i" option using the component output without it hanging my
> X.  *shrug*
>
>
> Anyone have other suggestions for the cause of these troubles?

turn off OpenGL vsync in nvidiasettings

-- 
Steve
Before you ask, read the FAQ!
http://www.mythtv.org/wiki/index.php/Frequently_Asked_Questions
then search the Wiki, and this list,
http://www.gossamer-threads.com/lists/mythtv/
Mailinglist etiquette -
http://www.mythtv.org/wiki/index.php/Mailing_List_etiquette