Re: New Address Family: Inter Process Networking (IPN)

[Chris Friesen]

Andi Kleen wrote:
> > "This document describes Linux Netlink, which is used in Linux both as
> >   an intra-kernel messaging system as well as between kernel and user
> >   space."
>
>
> It can be used between user space daemons as well. In fact it is.
> e.g. they often listen to each other's messages.

One problem we ran into was that there are only 32 multicast groups per 
netlink protocol family.

We had a situation where we could have used netlink, but we needed the 
equivalent of thousands of multicast groups.  Latency was very 
important, so we ended up doing essentially a multicast unix socket 
rather than taking the extra penalty for UDP multicast.

Chris
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