[linux-dvb] Re: IP multicast package loss with current CVS driver

["Michael Dreher" <list@5dot1.de>]

Hi,

 > I'm loosing a lot of IP packets with this version. Any
 > suggestions how to fix this?

I still haven't found a solution for my problem or even a way how to track
it down.

I'm using a Debian Kernel 2.4.19, and a full featured DVB card with a Conax
CAM module.
vdr 1.1.25 is tuning to "Data only:12633:h:S19.2E:22000:0:0:0:0:0:0:0:1001",
that means
no filters are set for audio/video pids. A self written plugin (not
released, yet)
creates the DVB network interface and sets the network pid 1014.

The DVB driver from 2003-04-13 had no problems with lost ip packages. At
least all of the
errors were recoverable. But this version crashes after some days of
continous reception
and that's the reason why I have to update to a newer version. Even the
kernel
software-watchdog is unable to reboot the computer in this case.

The CVS version of the DVB from 2003-10-06 driver looses IP multicast
packets (UDP).
From a total of 4922 packages I'm loosing 368 packages. I tried both
firmwares
(Root and Root-icam) with the same result. This versions runs very stable
for me.

The application C-Terminal from Castify Networks can resolve 346 of the lost
packages with its own error correction algorithm, but that still means 22
unrecoverable lost packages.

The part from /var/log/messages, where the multicast filters are set:
Oct  6 22:53:13 atu-dev kernel: dvb0_0: set_mc_list, 2 entries
Oct  6 22:53:13 atu-dev kernel: dvb_net_feed_start: rx_mode 1
Oct  6 22:53:13 atu-dev kernel: dvb_net_feed_start: alloc secfeed
Oct  6 22:53:13 atu-dev kernel: dvb_net_feed_start: set secfilter
Oct  6 22:53:13 atu-dev kernel: dvb0_0: filter mac=00 d0 5c 02 cd 26
Oct  6 22:53:13 atu-dev kernel: dvb0_0: filter mask=ff ff ff ff ff ff
Oct  6 22:53:13 atu-dev kernel: dvb_net_feed_start: set multi_secfilter[0]
Oct  6 22:53:13 atu-dev kernel: dvb0_0: filter mac=01 00 5e 02 02 0a
Oct  6 22:53:13 atu-dev kernel: dvb0_0: filter mask=ff ff ff ff ff ff
Oct  6 22:53:13 atu-dev kernel: dvb_net_feed_start: set multi_secfilter[1]
Oct  6 22:53:13 atu-dev kernel: dvb0_0: filter mac=01 00 5e 00 00 01
Oct  6 22:53:13 atu-dev kernel: dvb0_0: filter mask=ff ff ff ff ff ff
Oct  6 22:53:13 atu-dev kernel: dvb_net_feed_start: start filtering


Please can anybody give me some hints how to resolve the problem.
Which additional informations is needed? Does anybody have a
similar setup (full featured DVB card with IP data reception),
that works?

The old driver version works, but crashes very often, therefore I
think it must be possible to get this setup running.

Have there been any general changes in the driver, that can lead
to ip packet loss (performance/timing issues or throwing away
TS packages because of bad checksums) or is this only related
to the network part of the driver?

  Michael



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