[ewg] [PATCH] Make multicast and path record queue flexible.

[Christoph Lameter]

On Tue, 5 Oct 2010, Jason Gunthorpe wrote:

> > The problem is that the client join on 224.0.0.22 will be delayed due to
> > fabric reconfig. The group is joined on demand. It is not automatically
> > joined.
>
> I was trying to explain that it is possible for the SM to provide a
> MLID that is fully functional for .22 - there is no behind the scenes
> network reconfiguring delay. This is doable with IGMPv3 because the
> client join is send-only and all the listeners have been joined for a
> long time.

Ahh.. Good idea.

> There is virtually no cost with preconfiguring switches for send only
> traffic.

True.

> > Sure this sounds to be a much better approach (we have thought through
> > such approaches here repeatedly) but I do not know of any IB gateway that
> > supports IGMPv3.
>
> Lean on the vendors :( Seems crazy to not implement v3 when v2 is so
> unworkable on IB.

Oh we will.... Do obsidian routers support IGMPv3 for IB?