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