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

[Matthias Bodenbinder <matthias@bodenbinder.de>]

On Saturday 20 November 2004 21:42, Rainer Zocholl wrote:
> (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.

I am using ext3. But I did so before with SuSE 8.x and had no issues. 
As I said in my last posting: Not all channels are affected. It is mainly ZDF, RTL, SuperRTL and NTV.
This rules out a hardware problem I think.

Matthias

Matthias