[mythtv-users] Driver buffers overflowed on one channel
ccljacobson at comcast.net
ccljacobson at comcast.net
Mon Mar 5 01:19:27 UTC 2007
All,
I've noticed a little more about this problem. It does seem to be dependent upon the show. I just happened to be flipping channels the other morning and one of the paid advertisements actually came in just fine. I tried it again a few hours later and it was the same old problem.
I've captured the vmstat output as well as an entire session's mythbackend logs.
# vmstat 10 100
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
r b swpd free buff cache si so bi bo in cs us sy id wa st
0 1 508 43088 10524 1045264 0 0 225 302 200 177 9 2 87 2 0
0 0 508 42164 10624 1044924 0 0 0 1035 3987 2297 0 2 96 1 0
2 0 508 50596 8984 920020 0 0 1 1559 4123 4158 7 4 85 4 0
0 0 508 45792 9032 920412 0 0 0 1436 4207 4682 7 3 87 3 0
0 0 508 42340 9160 923532 0 0 0 1372 4214 4366 14 3 81 2 0
0 0 508 43128 9268 923520 0 0 0 1586 4224 4720 6 3 88 3 0
0 0 508 44720 9368 921972 0 0 0 1660 4228 4694 7 4 85 4 0
0 0 508 43052 9216 922464 0 0 0 1555 4160 4609 5 3 90 2 0
1 0 508 44512 9072 920868 0 0 1 1509 4159 4455 5 3 89 3 0
0 0 508 45524 9148 920232 0 0 0 1438 4149 4350 5 3 88 3 0
0 0 508 44132 9240 922032 0 0 0 1670 4182 4134 5 3 89 4 0
3 0 508 42316 9312 923812 0 0 0 1707 4163 4357 5 3 89 2 0
1 0 508 160220 9416 931752 0 0 0 1826 3889 3425 2 3 92 3 0
2 0 508 144720 9516 946576 0 0 0 1488 3419 2410 0 2 96 2 0
Here's my mythbackend output log:
2007-03-04 18:06:29.362 MainServer::HandleAnnounce Playback
2007-03-04 18:06:29.383 adding: localhost.localdomain as a client (events: 0)
2007-03-04 18:06:29.398 TVRec(2): Changing from None to WatchingLiveTV
2007-03-04 18:06:29.409 TVRec(2): HW Tuner: 2->2
2007-03-04 18:06:30.581 Finished recording Da Vinci's Inquest "The Bridge": channel 1201
2007-03-04 18:06:30.701 Finished recording Da Vinci's Inquest "The Bridge": channel 1201
2007-03-04 18:06:30.727 Preview Error: Previewer file '/media/recordings/1201_20070304180629.mpg' is not valid.
2007-03-04 18:06:43.727 EITScanner: Added 22 EIT Events
2007-03-04 18:06:43.789 Reschedule requested for id -1.
2007-03-04 18:06:43.947 Scheduled 50 items in 0.2 = 0.07 match + 0.09 place
2007-03-04 18:06:43.956 scheduler: Last message repeated 5 times: Finished recording: Da Vinci's Inquest "The Bridge": channel 1201
2007-03-04 18:06:43.994 scheduler: Scheduled items: Scheduled 50 items in 0.2 = 0.07 match + 0.09 place
2007-03-04 18:07:49.965 DevRdB(1) Error: Driver buffers overflowed
2007-03-04 18:07:53.126 DevRdB(1) Error: Driver buffers overflowed
2007-03-04 18:07:56.292 DevRdB(1) Error: Driver buffers overflowed
2007-03-04 18:07:59.454 DevRdB(1) Error: Driver buffers overflowed
2007-03-04 18:08:02.620 DevRdB(1) Error: Driver buffers overflowed
2007-03-04 18:08:05.785 DevRdB(1) Error: Driver buffers overflowed
2007-03-04 18:08:08.949 DevRdB(1) Error: Driver buffers overflowed
2007-03-04 18:08:10.523 TVRec(2): Changing from WatchingLiveTV to None
2007-03-04 18:08:15.352 Finished recording Da Vinci's Inquest "The Bridge": channel 1201
2007-03-04 18:08:15.401 scheduler: Finished recording: Da Vinci's Inquest "The Bridge": channel 1201
Notice that it took about a minute for the "Driver buffers overflowed" error message to start appearing. Increasing the HD Ringbuffer size to the maximum seems to affect how quickly this message appears. Lowering it to the minimum makes the error message appear almost immediately. It does not, however, affect the channel recording/playback quality.
BTW, I've since upgraded to kernel 2.6.19-1.2911.6.4.fc6 without any affect.
As always any help is greatly appreciated.
Lonny
-------------- Original message ----------------------
From: ccljacobson at comcast.net
> All,
>
> I've been running MythTV on my new HTPC for about a month now and one of the
> nagging problems that I still have is that one HDTV channel, KTVD-DT in Denver,
> doesn't come in correctly. All other are good. It takes a little longer for
> MythTV to tune in the channel. Once it's going, it will play for a second and
> then pause for a couple seconds. Also, during this time there are visual
> artifacts (or glitches) and sometimes only a partial image is shown. This is
> true regardless of live or recorded TV. Hitting F7 while watching the channel
> says that the signal is 85 to 90 percent.
>
> With the same antenna configuration, I've been able to watch this channel
> without problem in both Kaffeine on Linux and BeyondTV on Windows XP.
>
> I'm using the atrpms.net RPMs on FC 6 and I've tried both the 0.20 stable and
> several versions of the 0.21 trunk RPMs without any noticeable difference.
>
> One thing that I see in the mythbackend.log are many messages like the
> following:
> 2007-02-25 11:05:20.179 DevRdB(1) Error: Driver buffers overflowed
> 2007-02-25 11:05:23.344 DevRdB(1) Error: Driver buffers overflowed
> 2007-02-25 11:05:26.507 DevRdB(1) Error: Driver buffers overflowed
> 2007-02-25 11:05:29.670 DevRdB(1) Error: Driver buffers overflowed
>
> My uptime is rather low:
> 11:09:03 up 15:40, 1 user, load average: 0.70, 0.52, 0.30
>
> The disk utilization is rather low as well (md2 contains the LiveTV recordings
> and goes across sd[a-d]):
> # iostat -dmx 10 2
> Linux 2.6.19-1.2895_0.99.fc6.cubbi_suspend2_8k (localhost.localdomain)
> 02/25/2007
>
> Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz
> await svctm %util
> sda 14.49 14.69 6.36 3.25 0.09 0.07 34.27 0.05
> 5.32 3.02 2.91
> sdb 16.21 14.66 6.68 3.27 0.10 0.07 34.79 0.05
> 5.16 2.91 2.89
> sdc 14.33 15.42 6.33 3.30 0.09 0.08 34.55 0.05
> 5.67 3.07 2.96
> sdd 0.00 0.00 0.00 0.00 0.00 0.00 15.89 0.00
> 3.48 2.93 0.00
> md0 0.00 0.00 2.84 6.48 0.03 0.03 11.76 0.00
> 0.00 0.00 0.00
> md2 0.00 0.00 9.87 26.05 0.18 0.10 15.86 0.00
> 0.00 0.00 0.00
> md1 0.00 0.00 0.00 0.00 0.00 0.00 8.00 0.00
> 0.00 0.00 0.00
>
> Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz
> await svctm %util
> sda 3.10 33.97 2.20 7.09 0.02 0.17 42.32 0.11
> 12.15 9.75 9.06
> sdb 10.99 27.47 0.50 5.19 0.04 0.14 65.82 0.08
> 14.84 10.26 5.84
> sdc 7.89 31.97 2.60 6.49 0.04 0.16 45.80 0.17
> 18.93 11.13 10.12
> sdd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
> 0.00 0.00 0.00
> md0 0.00 0.00 0.60 7.59 0.00 0.03 8.39 0.00
> 0.00 0.00 0.00
> md2 0.00 0.00 0.10 76.12 0.00 0.30 8.00 0.00
> 0.00 0.00 0.00
> md1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
> 0.00 0.00 0.00
>
> Here's my current configuration:
> Motherboard: Abit NF-M2
> CPU: AMD Athlon(tm) 64 X2 Dual Core Processor 4200+ (65W)
> Memory: 2GB (4 x 512MB Corsair PC2 6400)
> Hard Disk: 4 x 500GB SATA WD in Linux software RAID 5 EXT3
> Tuners: 2 x Dvico FusionHDTV 5 USB
> Linux: 2.6.19-1.2895_0.99.fc6.cubbi_suspend2_8k
> MythTV: mythtv-0.21-154_trunk_r12854.fc6.at
>
> Thank you in advance.
>
> Lonny
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