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

[Matthias Bodenbinder <matthias@bodenbinder.de>]

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.
> 
> Ok, that was step 2.
> Now step one: ;-)
> 
> What values does a test with "hdparm -t -T" deliver?
> (Backgroaund: If your new distribution does not contain the
> right driver, linux falls back to PIO mode...)
> 
> # hdparm -T -t /dev/hda7
> 
> /dev/hda7:
>  Timing buffer-cache reads:   128 MB in  0.79 seconds =162.03 MB/sec
>  Timing buffered disk reads:  64 MB in  1.44 seconds = 44.44 MB/sec
>     
> 
> try at least twice
> 
> I'm pretty sure that you system will only have values
> significantly below 10MB/s (typ.2..4MB/s).
> That indicates "PIO Mode".

My values are:

/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?

Matthias