[erlang-questions] gen_sctp fail with EAGAIN, Is SCTP sockets non-blocking?

[Serge Aleynikov]

A few years back when we wrote the SCTP protocol binding, we did limited
performance testing and it was a bit slower than of TCP but was comparable.

It's is normal that you may be getting EAGAIN on the low-level sockets as
all sockets are opened in the non-blocking mode.  You may want to increase
the sending/receiving socket buffer size, which may help a bit (see
inet:setopts/2: {sndbuf, Size}, {recbuf, Size}).

Serge

On Thu, Nov 5, 2015 at 11:34 AM, Ameretat Reith <ameretat.reith@REDACTED>
wrote:

> Hi,
>
> I get very poor throughput when using SCTP instead of TCP.  My program
> simply asks another node his records in an ETS.  I narrowed problem,
> removed pagination and tried to continuously send data to socket and
> saw gen_sctp:send being failed with EAGAIN after some writes.
>
> Does Erlang open sctp sockets asynchronously? Is there a way I can
> change it?
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