[mythtv-users] SMP Performance

[Brad DerManouelian]

On Dec 10, 2006, at 1:37 PM, Greg Grotsky wrote:

> On 12/10/06, Brad DerManouelian <myth at dermanouelian.com> wrote:
>
> On Dec 10, 2006, at 11:53 AM, Brad DerManouelian wrote:
>
> > I'm also running 64bit but on FC5 and the nvidia 8776 binary
> > drivers. Right now I'm watching an ABC HD program which I think is
> > 720p and using 96% CPU. 1080i content uses over 100% since it's de-
> > interlacing as well.
>
> I take that back. I was running a transcode process on one core
> (taking the whole core) and those were my numbers for playback. Now
> the transcode process stopped freeing up my second core and now I'm
> seeing Xorg taking between 90-98% of one core and mythfrontend taking
> 60-63%. This seems especially excessive. I'm having a hard time
> upgrading with ATrpms right now but if I ever figure that out I'll
> try upgrading my nvidia driver and see if it helps.
>
> Brad, I am also outputting to a TV in 1080p and using kernel deint  
> with nvidia 9629 (recent).  I have looked at my cpu usage several  
> times throughout the past: on 720p material I see 60-70% cpu usage;  
> 1080i 70-80%, it might be your nvidia binary... I remember there  
> was one nvidia release that shot CPU usage through the roof, I  
> think it was in the 6000 series though.  I update myth to SVN  
> almost weekly, and I run aptitude/deselect almost monthly to update  
> the rest of the software and stay on the sometimes painful cutting  
> edge. :)

I just upgraded my system to a new kernel (2.6.18-1.2239.fc5) and new  
nvidia drivers (9631). kernel deinterlace gives me 105% on  
mythfronend and 25% on xorg. linear deinterlace is the same as it was  
before. This is the reason I ended up upgrade my AMD 64 3200+ system.  
I was tired of trouble-shooting XvMC and OpenGL settings to get  
something that worked. Now it works, just chews up all my CPU. I am  
using an nVidia 6600-OC card. It's PCI-Express. I just kept throwing  
money at the machine until I could watch HD without stuttering. My  
time was worth more to me than the cash I was spending on it. This is  
also the reason I don't run svn. I get too frustrated when things  
break so I'm using up to date .20 from ATrpms.

>
>   Are you running a FC released kernel?  I'm not sure it matters  
> but I'm using one I built from kernel.org currently, 2.6.19.  It's  
> setup with exactly the drivers and options that I need.  Make sure  
> you are using nvAGP, you have to disable the agpgart in your kernel  
> config in order for the nvidia driver to enable it's own driver.
>
> -Greg
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