[mythtv] what does "DVBRec(1): PID 0x840 discontinuity detected" mean?

[Steven Adeff]

On 10/3/06, Stuart Auchterlonie <stuarta at squashedfrog.net> wrote:
> On Tue, Oct 03, 2006 at 08:06:21AM -0400, Steven Adeff wrote:
> > >
> > > It's in quite a fundamental area of the packet processing,
> > > so i'm going to await further reports for a while before
> > > considering it for inclusion.
> >
> > is there a way to tell if the issue is with the signal the card is
> > receiving or something internal to the computer?  I'm just having a
> > hard time understanding why this would randomly start happening and
> > the cable line looks to be clean?
> >
> > It also seems to occur more during heavy i/o load, though this is more
> > a casual observance. When all three of my HD recorders are going it
> > seems to be more of an issue than when just one is.
> >
>
> Sounds like you may be running into limitations with
> 1) PCI bus maximum throughput
> 2) I/O throughput to your storage
>
> also check your dmesg and see if any errors are being thrown
> by the driver. verify also that each card has it's own interrupt.

Stuart, thanks for helping me with this. Some "answers" to your questions...

I/O: I've been using the same RAID10 setup with no changes for months
now. I wonder if perhaps fragmentation on my recordings drive is
slowing it down now to the point of being an issue? I run XFS, I don't
know if its something that can be an issue with XFS? I discovered
xfs_fsr well into having a full recording drive, so I don't use it.
perhaps I should erase all watched recordings that I can to empty the
drive out and then begin doing a defrag process?

IRQ:
Subsystem: Hauppauge computer works Inc. WinTV PVR 150
Flags: bus master, medium devsel, latency 64, IRQ 225
Memory at e8000000 (32-bit, prefetchable) [size=64M]
Capabilities: [44] Power Management version 2

Subsystem: pcHDTV pcHDTV HD3000 HDTV
Flags: bus master, medium devsel, latency 32, IRQ 10
Memory at f9000000 (32-bit, non-prefetchable) [size=16M]
Capabilities: [44] Vital Product Data
Capabilities: [4c] Power Management version 2

Subsystem: pcHDTV pcHDTV HD3000 HDTV
Flags: bus master, medium devsel, latency 32, IRQ 217
Memory at fa000000 (32-bit, non-prefetchable) [size=16M]
Capabilities: [4c] Power Management version 2

Subsystem: Avermedia Technologies Inc AVerTVHD MCE A180
Flags: bus master, medium devsel, latency 32, IRQ 233
Memory at fbffe000 (32-bit, non-prefetchable) [size=2K]
Capabilities: [40] Power Management version 2

Subsystem: Avermedia Technologies Inc AVerTVHD MCE A180
Flags: bus master, medium devsel, latency 32, IRQ 225
Memory at fbfff000 (32-bit, non-prefetchable) [size=2K]
Capabilities: [40] Power Management version 2

it looks like one of my A180's and my PVR150 are on the same IRQ.

In my kern.log I seem to be getting a lot of
Oct  2 21:29:32 mythbox kernel: cx88[0]/2: queue is empty - first active
Oct  2 21:29:32 mythbox kernel: cx88[0]/2: cx8802_start_dma w: 0, h: 0, f: 2
Oct  2 21:29:32 mythbox kernel: cx88[0]/2: setting the interrupt mask
Oct  2 21:29:32 mythbox kernel: cx88[0]/2: [ffff81003a356200/0]
cx8802_buf_queue - first active
Oct  2 21:29:32 mythbox kernel: cx88[0]/2: cx8802_restart_queue
Oct  2 21:29:32 mythbox kernel: cx88[0]/2: cx8802_restart_queue: queue is empty
Oct  2 21:29:32 mythbox kernel: cx88[0]/2: queue is empty - first active
Oct  2 21:29:32 mythbox kernel: cx88[0]/2: cx8802_start_dma w: 0, h: 0, f: 2
Oct  2 21:29:32 mythbox kernel: cx88[0]/2: setting the interrupt mask
Oct  2 21:29:32 mythbox kernel: cx88[0]/2: [ffff810012f8aa00/0]
cx8802_buf_queue - first active
Oct  2 21:29:33 mythbox kernel: cx88[0]/2: cx8802_restart_queue
Oct  2 21:29:33 mythbox kernel: cx88[0]/2: cx8802_restart_queue: queue is empty
Oct  2 21:29:33 mythbox kernel: cx88[0]/2: queue is empty - first active
Oct  2 21:29:33 mythbox kernel: cx88[0]/2: cx8802_start_dma w: 0, h: 0, f: 2
Oct  2 21:29:33 mythbox kernel: cx88[0]/2: setting the interrupt mask
Oct  2 21:29:33 mythbox kernel: cx88[0]/2: [ffff810015f3be00/0]
cx8802_buf_queue - first active
Oct  2 22:01:30 mythbox kernel: cx88[0]/2: cx8802_restart_queue
Oct  2 22:01:30 mythbox kernel: cx88[0]/2: cx8802_restart_queue: queue is empty

let me know if you see anything that jumps out at you that I should
look into/etc.

-- 
Steve
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