[zeromq-dev] QoS support

[Steven McCoy]

2009/11/7 Alexander <mittspamkonto at gmail.com>

> I'm doing some research about using message queuing for an application
> currently using a reliable multi-cast solution. This app has some
> requirements related to speed and safety, so I will need to be able to
> control QoS (TOS, DiffServ or any equivalent network-level QoS
> support) of the packages in the network.
>

QoS only works at routers, it has limited meaning at other network
elements.  Generally you configure the gateway routers to add the tags to
traffic instead of trusting the software to do it properly.

OpenPGM actually tags everything with expedited forwarding (0x2e).  SmartPGM
from Talarian allows you to configure different PGM packet types to
different ToS but I haven't seen the need to replicate such additional
configuration.

Similarly OpenPGM has minimal support for PGM routers which would be
significantly advantageous in such internetworks.  It's certainly possible
to add such functionality if desired.

-- 
Steve-o
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