[mythtv-users] Performance issues with new hardware.

Mike Perkins mikep at randomtraveller.org.uk
Sat Mar 17 21:29:22 UTC 2007


Jon wrote:
> 
> 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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> 
You mention "locks up" in the program guide. Can you be more specific? 
Reason I ask is that under certain conditions (which I have not yet been 
able to identify), once in the program guide, I can wait one minute (60 
seconds) for keypresses to be acted upon. Then of course it does that 
and the next 5 keypresses I made before I realised what was happening.

Have you actually waited that long to see if anything happens?

Mike Perkins


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