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

["Augusto Cardoso" <augusto@carhil.net>]

Hi!

With a different card, I was able to run 40Mbps+ data rates without any drop packets. This with the B2C2 card.
One suggestion is to increase the socket buffers:
/sbin/sysctl -w net.core.rmem_default=524287
/sbin/sysctl -w net.core.rmem_max=524287
/sbin/sysctl -w net.core.wmem_default=524287
/sbin/sysctl -w net.core.wmem_max=524287

Note that you probably only need the rmem. You can modify only the rmem_mas, but then the application has to change the buffer size.

	Augusto

*********** REPLY SEPARATOR  ***********

On 10/8/2003 at 1:57 PM Johannes Stezenbach wrote:

>Michael Dreher wrote:
>>
>>  > 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.
>
>First thing to check is the data rate. With full featured cards there's
>a limit at (wild guess) 10 Mbit/sec.
>
>
>> 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.
>
>Hm, there's not much traffic there...
>
>You could run "DVB/apps/test_sections 1014" to see if the missing
>packets appear this way. (See ETSI EN 301 192, section
>"multiprotocol encapsulation").
>
>If your packets don't appear there, it would be due to reception
>problems, stream errors or the data rate is too high for full
>featured cards.
>
>If test_sections shows your missing packets, then either the filters
>are not setup correctly in dvb_net.c, or the get dropped in the
>Linux network stack (wrong routes? bad flags or addresses?).
>
>> The DVB driver from 2003-04-13 had no problems with lost ip packages. At
>> least all of the
>> errors were recoverable.
>
>There were quite some changes to dvb_net.c, including stricter
>error checking. Maybe I introduced new bugs. I would be grateful
>if you could check against EN 301 192.
>
>
>Regards,
>Johannes
>
>
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