[mythtv-users] performance on Via cpu when watching live tv
Robin Gilks
g8ecj at gilks.org
Sat Jan 3 23:02:25 UTC 2009
> Hi!
>
> I finally got mythtv working (with a dvb card). Not an easy ride it was.
>
> I'm still trying to smooth the setup of this, for instance, watching
> live tv is slow. I don't know why - playing normal on-disc movies goes
> smoothly. I wath tv via a dvb tuner, which works OK with pure mplayer
> or xine. In mythtv however, both audio and video pauses every few
> seconds and cpu usage is constantly 100 %:
>
> top - 22:04:25 up 5:04, 2 users, load average: 4.54, 3.08, 1.84
> Tasks: 100 total, 3 running, 96 sleeping, 1 stopped, 0 zombie
> Cpu(s): 81.4%us, 11.8%sy, 0.7%ni, 0.0%id, 0.0%wa, 5.9%hi, 0.3%si,
> 0.0%st
> Mem: 449904k total, 443960k used, 5944k free, 2988k buffers
> Swap: 4088500k total, 127332k used, 3961168k free, 133928k cached
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 13036 freevox 20 0 316m 80m 41m S 53.1 18.4 4:18.59
> mythfrontend
> 4361 root 19 -1 257m 58m 21m R 37.1 13.3 19:27.81 X
> 13011 mythtv 20 0 220m 23m 8308 S 6.2 5.4 0:30.34
> mythbackend
>
> As you can see, I also run my backend on this machine but it doesn't
> use so much cpu time... I don't think this system is too slow for a
> mythtv frontend?
>
> cpuinfo
> processor : 0
> vendor_id : CentaurHauls
> cpu family : 6
> model : 9
> model name : VIA Nehemiah
> stepping : 8
> cpu MHz : 1330.000
> cache size : 64 KB
> fdiv_bug : no
> hlt_bug : no
> f00f_bug : no
> coma_bug : no
> fpu : yes
> fpu_exception : yes
> cpuid level : 1
> wp : yes
> flags : fpu vme de pse tsc msr cx8 sep mtrr pge cmov pat mmx fxsr sse
> up rng rng_en ace ace_en
> bogomips : 2666.69
> clflush size : 32
> power management:
>
>
> The distro is a Mandriva 2009.
I'm running Gentoo on an Epia SP13000 which returns the following specs -
sounds like you are running similar.
cpuinfo
processor : 0
vendor_id : CentaurHauls
cpu family : 6
model : 9
model name : VIA Nehemiah
stepping : 8
cpu MHz : 1333.418
cache size : 64 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr cx8 sep mtrr pge cmov pat mmx
fxsr sse rng rng_en ace ace_en
bogomips : 2670.15
clflush size : 32
I used to run the OpenChrome driver in XvMC VLD mode but I've found that
it can keep up in standard Xvideo mode with the Slim profile with no
de-interlacers (and it avoids DVD still frame problems in VLD mode).
I'd try playing with profiles/deinterlacers...
--
Robin Gilks
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