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Problem: PGM doc missing info on high data rates

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Solution: Include a new section on configuring both ZMQ and the host
OS tx/rx buffers to facilitate sending large messages at a high data
rate with the PGM protocol.
This commit is contained in:
jackpimbert 2019-05-24 09:48:03 +02:00
parent 840b9ba4fa
commit 940f54e7ce
1 changed files with 24 additions and 0 deletions
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doc/zmq_pgm.txt
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@ -130,6 +130,30 @@ Third datagram payload
....
CONFIGURATION
-------------
The PGM is protocol is capable of multicasting data at high rates (500Mbps+)
with large messages (1MB+), however it requires setting the relevent ZMQ socket
options that are documented in linkzmq:zmq_setsockopt[3]:
* The 'ZMQ_RATE' should be set sufficiently high, e.g. 1Gbps
* The 'ZMQ_RCVBUF' should be increased on the subscriber, e.g. 4MB
* The 'ZMQ_SNDBUF' should be increased on the publisher, e.g. 4MB
It's important to note that the 'ZMQ_RCVBUF' and 'ZMQ_SNDBUF' options are
limited by the underlying host OS tx/rx buffer size limit. On linux, these can
be increased for the current session with the following commands:
....
# set tx/rx buffers to 4MB (default can also be read as the initial buffer size)
sudo sysctl -w net.core.rmem_max=4194304
sudo sysctl -w net.core.wmem_max=4194304
sudo sysctl -w net.core.rmem_default=4194304
sudo sysctl -w net.core.wmem_default=4194304
....
EXAMPLE
-------
.Connecting a socket