[ewg] Re: OFED 1.3 RC2 - multicast support to perftest package

[Or Gerlitz]

Tziporet Koren wrote:
> Release information: 
> Specific module changes:
> Utilities:
> Performance tests: 
> *	Added multicast support to ib_send_bw and ib_send_lat tests

Tziporet,

Looking on the commit, it seems that the perftest tools were 
instrumented to send/receive multicast on a hard coded MGID/MLID, ie no 
join/leave etc.

Basically, I am not against enabling such approach, however the MLID 
chosen was 0xc000 which on many clusters assigned by the SM to the IPoIB 
IPv4 broadcast group of the default partition... so users playing with 
ib_send -g can storm all nodes on the cluster with messages etc... 
support wise it does not seem very good idea to do it this way.

Or.