[mythtv-users] Poor playback performance on Mac mini

[Raymond Wagner]

On 3/10/2012 16:51, Joe Nyland wrote:
> Xeon E31230 3.2 GHz (Quad core +HT) CPU - 4 cores assigned to MythTV 
> backend server

So that means MythTV has full access to the CPU?

> Recordings stored on 3 1TB Seagate drives in md RAID5

Do you have your database on this same array?  What filesystem are you 
using?

>   * CPU usage is around 50% on my primary frontend when playing back
>     recordings - I'm not sure this is all MythFrontend, but it proves
>     the point that the CPU is not exhausted.
>

On the contrary.  It means you are using one full core of that 2.4GHz 
Core 2 Duo, and hitting a wall because something is single threaded.  On 
Linux, that should be sufficient for CABAC H264 content at around 
12-14Mbps, which is rather high for broadcast HD, and well beyond what 
you should be seeing for SD video.  Considering you are running the same 
version of MythTV and OSX on the iMac, is it having similar problems?  
What is the CPU usage during playback?

>   * RAM usage hovers around 2GB mark on my primary frontend.
>

Well that simply doesn't sound right.  Even at 1080p and an artwork 
intensive theme, you shouldn't be hitting half that.  Are you reading 
the resource usage, or the virtual memory allocation?

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