[zeromq-dev] ZMQ_STREAM and incoming message size limit over TCP

Doron Somech somdoron at gmail.com
Wed May 4 16:22:35 CEST 2016

It is hard coded in the libzmq, you can change it and recompile, change
in_batch_size in config.hpp.

If you really want to you can make a socket option to change it, maybe
If you do make a new socket option, you want to give it to the raw_decoder
in stream_engine.cpp

[1] https://github.com/zeromq/libzmq/blob/master/src/config.hpp#L60
[2] https://github.com/zeromq/libzmq/blob/master/src/stream_engine.cpp#L198

On Wed, May 4, 2016 at 4:34 PM, Zarko Bulatovic <zb10948 at gmail.com> wrote:

> Hi,
> My incoming messages to stream socket are being split in < 8kB parts,
> while I don't have any framing denomination on the ZeroMQ side. As I
> understand, this is down to OS TCP sockets implementation cuting them to
> some MTU size, but I don't see it. If I do tcpdump on my channel, I am
> seeing 20kB packets being relayed from source to destination socket (dest
> is ZMQ_TCP).
> I have tried raising the ZMQ_RCVBUF value for the socket, no luck. I have
> also tried getting the limit from the underlying fd, which gets retreived
> OK via zmq_getsockopt() with ZMQ_FD, but standard getsockopt() with
> SO_RCVBUF on that fd yields an "Socket operation on non-socket" error.
> I would appreciate any idea on how to tackle this issue. I can always
> implement message integrity on my side but I wanted to utilize one of many
> great ZMQ functionalities... :)
> Best Regards,
> ZB
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