[Olsr-dev] OLSR1: sendto IPv4 Resource temporarily unavailable / affects other neighbours

Henning Rogge (spam-protected)
Fri Sep 26 14:46:23 CEST 2014

On Fri, Sep 26, 2014 at 2:23 PM, Bastian Bittorf <(spam-protected)> wrote:
> * Henning Rogge <(spam-protected)> [26.09.2014 13:43]:
>> Errno 11 is "Resource temporary not available"... which is EWOULDBLOCK/EAGAIN.
>> It seems that the outgoing UDP socket would block. Hmm...
> http://stackoverflow.com/questions/4165174/when-does-a-udp-sendto-block
> "This can happen if you filled up your socket buffer, but it is highly
> operating system dependent. Since UDP does not provide any guarantee
> your operating system can decide to do whatever it wants when your
> socket buffer is full: block or drop. You can try to increase SO_SNDBUF
> for temporary relief. This can even depend on the fine tuning of your
> system, for instance it can also depend on the size of the TX ring in
> the driver of your network interface."

I don't think OLSRd makes any tracking of the outgoing buffers... if
they block, the next packet should get through.

The question is why does your outgoing buffer block that long.


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