[mythtv-users] Performance issues with new hardware.

Jon jon at sd-6.org
Sat Mar 17 19:46:37 UTC 2007

Jon wrote:
> David Murphy wrote:
>> Jon wrote:
>>   However now no matter what I do cpu
>>> usage is peaked.  Can anyone shed some light?
>> Are you using the Nvidia binary driver?  If so, are you using
>> Option "UseEvents" "True"  in the Device section of your xorg.conf?
>> Should look something like this:
>> Section "Device"
>>          Identifier  "Videocard0"
>>          Driver      "nvidia"
>>          VendorName  "Videocard vendor"
>>          BoardName   "nVidia Corporation C51 PCI Express Bridge"
>>          Option "UseEvents" "True"
>> EndSection
> I've not used that option.  I will give it a try later and see what
> happens.  I am booting of a live usb root, so literally nothing has
> changed except the motherboard.  I wouldn't think the video card would
> be the issue unless there are performance issues with pci-e.  I thought
> it might be the sound card.  The new board has HDA audio which isn't
> well supported by linux yet.  I put in a different sound card but it
> didn't make any difference.
OK, I've added UseEvents.  I did gain about ~6% on my cpu.  Not much but
I switched out motherboards again anyway.  I then realized that I
removed agp=off from my commandline but still had NvAGP set in 1 in my
xorg.conf.  I added agp=off back to my commandline and performance is
actually much better with the new board, approx. 35% cpu usage now.
Unfortunately it still locks up in the program guide, but not near as
often.  It wouldn't be such a problem except that I have to restart the
backend because it still thinks the frontend is using the card.  This
really bites if I have a recording going but want to watch something else.

>> This option dropped cpu use substantially but I'm still running out of 
>> cycles playing HD mpeg-2 content w/ my Sempron 3400 running on an Asus 
>> M2NPV-VM.  I find this odd as I can play back the 1920x1080 HD version 
>> of Elephant's Dream encoded w/ Xvid at 10Mbps w/ no problems.  Initially 
>> I assumed that should be much more demanding than 1080i Mpeg-2 but that 
>> is not what I'm seeing here.  I have similar problems using an Athlon X2 
>> 3600 so I think there must be another issue in the mix here...drivers or 
>> something.
>> In any case I'd be interested to know your results if you have not yet 
>> enabled the UseEvents option.
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