[mythtv-users] Xbox frontend really slow, video only updates every few seconds

Daniel A. Segel mythtv at archer-segel.com
Sun Feb 12 18:00:50 UTC 2006


George Nassas wrote:

>On 12-Feb-06, at 11:32 AM, Daniel A. Segel wrote:
>
>  
>
>>I recently installed MythTV from SVN on my Xbox running Xebian 1.1.4,
>>and while it *works* as a frontend-only system, the performance is so
>>bad it's basically unusable. My backend system is using a PVR-350 to
>>...
>>Any tips on what to check or change to make it work better?
>>    
>>
>
>I'm running a similar setup (xbox/xebian 1.1.4/svn/BE with pvr350) and 
>getting good results although the poor thing swaps like crazy when I 
>switch from one thing to another (menu -> TV or video). However once 
>the swapper sorts things out it's great. One difference for me is that 
>I record at 480x480 but I don't know if that's significant.
>
>First question ought to be what process is hogging the cpu. What does 
>top say?
>  
>
The top several processes are all mythfrontend. It's using ~60-80% of 
the cpu, followed by XFree86. Everything else is using 1% or less.Only 
100MB of my 256MB swap is in use. It actually plays a second or two of 
video, then freezes for a few seconds, then plays again for a few 
seconds. This repeats as long as I let it. I'll try setting things to 
480x480 and see if that helps.

Top output:

top - 09:54:44 up 3 min,  2 users,  load average: 3.44, 1.71, 0.67
Tasks:  77 total,   3 running,  74 sleeping,   0 stopped,   0 zombie
Cpu(s):  81.9% user,  17.1% system,   0.0% nice,   1.0% idle
Mem:     58328k total,    56728k used,     1600k free,      792k buffers
Swap:   262136k total,   101564k used,   160572k free,    23784k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  
COMMAND           
 1961 live      19   0 39240  21m  19m R 38.6 37.9   0:18.80 
mythfrontend      
 1962 live      18   0 39444  21m  17m R 35.2 37.5   0:19.59 
mythfrontend      
 1963 live      10   0 39444  21m  17m S  7.2 37.5   0:03.07 
mythfrontend      
 1970 live       9   0 39444  21m  17m S  4.1 37.5   0:03.13 
mythfrontend      
 1964 live       9   0 39240  21m  19m S  3.8 37.9   0:02.38 
mythfrontend      
 1965 live      12   0 39240  21m  19m S  2.8 37.9   0:00.58 
mythfrontend      
 1894 root       6 -10 63724  14m  14m S  2.2 25.6   0:14.09 
XFree86           
 1978 root      16   0   908  852  692 R  2.2  1.5   0:01.29 
top               
 1971 live      11   0 39240  21m  19m S  1.9 37.9   0:00.53 
mythfrontend      
    1 root       8   0   372  340  340 S  0.0  0.6   0:04.15 init        

Daniel
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