[mythtv-users] Prebuffering pause with HD - really... no kidding...

devsk funtoos at yahoo.com
Sun Dec 17 18:06:15 UTC 2006

one possible configuration setting that people with high CPU usage should try is the kernel config parameter HZ. By default I think it is set to 1000 in 2.6 kernels. I use a value of 250 and my CPU usage stays at 10% on my x2 3800 with SD content with XvMC and 9631 drivers, and 24 color depth. I don't have HD content to try it. But I won't expect it to be anywhere near 100%.


----- Original Message ----
From: Greg Grotsky <spikeygg at gmail.com>
To: Discussion about mythtv <mythtv-users at mythtv.org>
Sent: Sunday, December 17, 2006 9:35:28 AM
Subject: Re: [mythtv-users] Prebuffering pause with HD - really... no kidding...

On 12/17/06, john sturgeon <john.sturgeon at gmail.com
> wrote: 
Thanks,  I tried that, but it made no difference.  The problem appears
to be the frontend.  Xorg and mythfrontend are battling it out for 

CPU.  When playing back HD content, they both always total 100%.
Seems odd.

Also, when using Xvmc mythfrontend comes in at 95% CPU, the
prebuffering stops, but that seems *awfully* high for an AMD 4200+.

John <><


John, those cpu usage numbers are not normal.  What distro are you running?  By the name of the myth module you are using it looks like fedora core, have you tried another?  I'm running the AMD64 release of Debian.  I'm not convinced that it's a distribution issue but there was another guy... Brad, who was running FC with a dual core 4400+ and seeing very high CPU usage as well.  Are you running a custom kernel?  What version is it?


Can anyone vouch for a working fedora core myth machine?  One that doesn't suck up 100% of a dual core 4200+ or 4400+?


Also, are you using agpgart?  If possible, try running NvAGP.  Check /proc/drivers/nvidia for any problems you might have with the driver while in X.  Specifically `cat /proc/drivers/nvidia/agp/status` will give you the details.


Mine reports:

Status: Enabled

Driver: NVIDIA
AGP Rate: 8x

Fast Writes: Disabled

SBA: Enabled


I'm running NVIDIA version 9629.  I just noticed that there is a 9631.  I'll have to try that soon they "improved some interaction with newer kernels".




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