Re: Is multicast only available with UD Transport mode?

[Steven Dake <sdake-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

On 11/13/2010 01:35 AM, Bart Van Assche wrote:
> On Fri, Nov 12, 2010 at 6:12 PM, <ib-x2spCj9RiN0z5UmgcLIfJQ@public.gmane.org> wrote:
>> Is multicast only available with UD Transport mode?
> 
> In the past several reliable multicast protocols have been developed
> on top of unreliable multicast for IPv4. See e.g.
> 
> S. Pingali, D. Towsley and J. Kurose, A comparison of sender-initiated
> and receiver-initiated reliable multicast protocols, SIGMETRICS '94
> Proceedings, 1994.
> 
> Note: I'm not sure how much work it would take to convert one of the
> existing reliable multicast protocols to IB.
> 
> Bart.
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Bart,

Corosync (http://www.corosync.org) implements The Totem Single Ring
Protocol which provides virtual synchrony via a closed process group C
programming API.  We have full support for native ibverbs/rdmacm
infrastructure for RDMA operation.

As an aside, it is challenging to bolt in RDMA support into any
multicast protocol - good luck to those out there wishing to take this
tsak on :)

If people would like to see some preliminary benchmarks, mail me off list.

Regards
-steve
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