[mythtv-users] Compile options for Atom/ION?

Tom Lichti redpepperracing at gmail.com
Thu Nov 12 19:02:29 UTC 2009

On Thu, Nov 12, 2009 at 1:55 PM, Jim Stichnoth <stichnot at gmail.com> wrote:
> On Wed, Oct 7, 2009 at 10:26 AM, Tom Lichti <redpepperracing at gmail.com> wrote:
>> On Wed, Oct 7, 2009 at 1:54 PM, Jim Stichnoth <stichnot at gmail.com> wrote:
>>> On Wed, Oct 7, 2009 at 3:16 AM, Chris Stevens <chris at mindblow.co.uk> wrote:
>>>> I have an Acer Revo using the Atom with ION graphics and have installed
>>>> Mandriva 2009.1 Powerpack which comes with the nVidia driver
>>>> (dkms-nvidia-current-185.18.36-3mdv2009.1).
>>>> I compiled Mythtv 0.21-fixes with:
>>>> ./configure --prefix=/usr --enable-proc-opt --enable-opengl-vsync
>>>> --enable-opengl-video --enable-xvmc-opengl
>>>> and everything is fine. You don't need Atom-specific compilation but you
>>>> do want the nVidia proprietary driver and OpenGL. Don't forget to enable
>>>> the OpenGL in mythfrontend.
>>>> Chris
>>> I have all the opengl support compiled in, and I'm using nVidia
>>> 185.18.36 and VDPAU.  There's no performance problem during playback,
>>> but when I exit a recording, it may take around 10 seconds to return
>>> to the recordings page, during which "top" reports mythfrontend using
>>> ~100% CPU.  So I was wondering if anyone, especially the gentoo folks,
>>> could recommend Atom-specific options that shorten these delays.  I
>>> can try --enable-proc-opt, but I was hoping that someone could report
>>> their experience on this kind of tuning.
>>> I think I'm using the Qt painter.  I'll try switching it to OpenGL and
>>> see if that makes a difference.
>> I see the same thing with the OpenGL painter, but it's more like 30
>> seconds...WAF is affected...
> I tracked down this 10+ second delay to deallocation of VDPAU buffers.
>  For some recordings (especially 1080i it seems), it takes a long
> time, like 0.6 seconds, to deallocate each buffer.  There are 17
> buffers used by default, leading to 10+ seconds.  I was able to reduce
> the number of buffers to the minimum of 6, which seems to work fine
> with ATSC and 720p HD-PVR recordings, and the delay is much better.
> This is done by adding vdpaubuffersize=6 to the filters section of the
> playback profile.

I saw your other message to the list about this, thanks for tracking
it down so diligently! I will play with that setting and see if it
helps. It may also help the 'VDPAU initialization' problem.


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