[linux-dvb] Re: lots of TS continuity errors + SuSE 9.1

[Rainer Zocholl <UseNet-Posting-Nospam-74308-@zocki.toppoint.de>]

(Matthias Bodenbinder)  20.11.04 20:48

>On Saturday 20 November 2004 18:50, Rainer Zocholl wrote:
>> matthias@bodenbinder.de(Matthias Bodenbinder)  20.11.04 15:23
>>
>>
>>>On Saturday 20 November 2004 15:10, Hamish Moffatt wrote:
>>>> On Sat, Nov 20, 2004 at 10:31:55AM +0100, Matthias Bodenbinder
>>>>> I am getting lots(!) of TS continuity errors on my system when I
>>>>> record for example ZDF.
>>>>> Oct 31 00:20:00 racoon vdr[8435]: cTS2PES got 0 TS errors, 173 TS
>>>>> continuity errors
>>>>>
>>>>> Everything worked fine with SuSE 8.x. No problems at all. The
>>>>> problems started with upgrading to SuSE 9.1. 
>>>>> Almost every channel reproduces the errors but ZDF is the worst.
>>>>>
>>>>> Viewing the live picture via vdr is just fine. No errors, no
>>>>> skipping. 
>>>>> But as soon as I start a recording the live picture
>>>>> starts to skip and I am getting these continuity errors. 
>>>>> Needless to say, that the recordings are useless.
>>>>
>>>> Can you check that you have DMA enabled on your disks?
>>>>
>>>> Sounds like you are losing packets due to fifo overflows or
>>>> similar.
>>
>>>DMA is on on all IDE devices.
>>
>> # hdparm -T -t /dev/hda7

>/dev/hda:
> Timing buffer-cache reads:   744 MB in  2.00 seconds = 371.87 MB/sec
> Timing buffered disk reads:   66 MB in  3.09 seconds =  21.39 MB/sec

>/dev/hdb:
> Timing buffer-cache reads:   816 MB in  2.00 seconds = 407.45 MB/sec
> Timing buffered disk reads:   76 MB in  3.05 seconds =  24.89 MB/sec

>They do not change significantly when I do it multiple times.

>Anything else I could test?

Hm, 21MB/s is not fast but of cause not PIO-Mode, so that's OK, IMHO.

Maybe try a test write timings?

What filesystems do and did you use?
Riser? ext3? XFS?

XFS would be the best for this purpose, AFAIK.



Rainer