[linux-dvb] Resource temporarily unavailable

[Paul Adriaenssens <paul.adriaenssens@democritus.net>]

We are using a Hauppauge WinTV-NOVA satellite card (model 541) to test
the reception of multicast data which is sent by our own IP-gateway in 
an endless loop.

In order to receive and decode the data we use a java program which 
opens a MulticastSocket on the correct port of the dvb0_0 interface and 
receives the DatagramPackets from it.

This process runs continuously to test the stability of the driver and 
our own FEC decoding software. It can run without any problem for 
several hours, even days, receiving all transmitted bytes, and then 
suddenly we get several of the following errors:

java.net.SocketException: Resource temporarily unavailable
at java.net.PlainDatagramSocketImpl.receive(Native Method)
at java.net.DatagramSocket.receive(DatagramSocket.java:672)

When this SocketException occurs, all bytes of the DatagramPacket get 
lost! We can't find any dvb kernel messages in /var/log/messages and we 
figured out that there is no correlation with the SNR or BER (even with 
BER=0 errors occured).

Has anybody else stress tested the dvb API for multicast data reception 
by one of the dvb0_* interfaces?
Do we need to "retune" de dvb card from time to time with "ntuxzap -c" 
or "szap -n" to avoid long uptime problems?
Can we get more logging from the dvb API to get more details about the 
reason for this problem?

We are using siemens_dvb-0.9.3 and Linux 2.4.9-13.

Thanks,

Paul

-------- Original Message --------
Subject: [linux-dvb] Resource temporarily unavailable
Date: Sun, 30 Dec 2001 14:51:07 -0000
From: "Jon Folland" <jon@nativ.tv>
To: <linux-dvb@linuxtv.org>

Has anybody come across the "Resource temporarily unavailable" error when
reading from a demux device?
I can open the device and set a PES or section filter successfully. However
calling read() gives the above error.

Anybody know how to remedy this without having to buy a new PC?

I am using a Hauppage WinTV-NOVA model 541 satellite card.



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