[mythtv-users] Random Stuttering

[Bryce]

Hi All,

I have an issue with my myth system that i'm struggling to get working.

I have a backend system thats an AMD Semperon 3000+ with 512MB Ram
10Gig boot disk and 2x200GB disks for media.
This has a Dvico DVB card for free to air TV (in australia) and a PVR-500
for foxtel.

I then have a frontend system thats a Pentium D 2.8Ghz, 1Gb Ram

The problem i get is that I get random stuttering of video recording.  It
might work fine for 30 mins then 2-3 seconds of stuttering or I might get
stuttering ever few minutes.  It seems random.

I can't see anything happening out of the ordinary on either system when
this occurs.  the only thing is that if i have a terminal window open on my
backend system and ping the frontend, during the stutering the ping times
jump up to over 1000ms for that few seconds - but the terminal windows on
the box don't freeze or anything like that.

64 bytes from 192.168.16.11: icmp_seq=249 ttl=64 time=0.326 ms
64 bytes from 192.168.16.11: icmp_seq=250 ttl=64 time=2156 ms
64 bytes from 192.168.16.11: icmp_seq=251 ttl=64 time=1156 ms
64 bytes from 192.168.16.11: icmp_seq=252 ttl=64 time=156 ms
64 bytes from 192.168.16.11: icmp_seq=253 ttl=64 time=0.132 ms

But pinging other boxes, or pinging the backend from a 3rd box does not do
this.

I've also tried to play the videos via samba on my windows machine and it
seems that its the actual videos that have the stuttering in them, not the
playback, so that makes me think its probably a backend problem, not a
frontend problem.

The stutering happens on both high definition and foxtel.

The backend does not seem to be working too hard:


top - 13:49:51 up 14:49,  1 user,  load average: 0.20, 0.10, 0.06
Tasks:  58 total,   2 running,  56 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.3%us,  0.7%sy,  0.0%ni, 96.7%id,  0.7%wa,  1.0%hi,  0.7%si,
0.0%st
Mem:    451472k total,   446396k used,     5076k free,     1356k buffers
Swap:   500464k total,      116k used,   500348k free,   356172k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 4569 mythtv    18   0  251m  20m  13m S  0.7  4.7   1:46.77 mythbackend
 4360 mysql     15   0  140m  29m 4744 S  0.0  6.8   0:04.55 mysqld
   71 root      10  -5     0    0    0 S  0.0  0.0   0:01.06 kswapd0
  784 root      21  -4  1908  704  376 S  0.0  0.2   0:00.84 udevd
 6568 root      23   0     0    0    0 S  0.0  0.0   0:00.55 nfsd
 6564 root      15   0     0    0    0 S  0.0  0.0   0:00.51 nfsd
 6565 root      15   0     0    0    0 S  0.0  0.0   0:00.44 nfsd

I dont' see major conficts for interuppts

wolverine ~ # cat /proc/interrupts
           CPU0
  0:   13429809    XT-PIC-XT        timer
  1:          8    XT-PIC-XT        i8042
  2:          0    XT-PIC-XT        cascade
  5:     519423    XT-PIC-XT        ivtv0
  7:      89130    XT-PIC-XT        cx88[0], cx88[0]
  8:          2    XT-PIC-XT        rtc
 10:          0    XT-PIC-XT        ivtv1
 11:    5155231    XT-PIC-XT        sata_via, eth0
 12:        130    XT-PIC-XT        i8042
 14:      34189    XT-PIC-XT        ide0
 15:      65054    XT-PIC-XT        ide1
NMI:          0
LOC:   13430083
ERR:          0
Any advice or suggestions would be greatly appreciated.

Thanks,
Dan Docmong
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