[ofa-general] Re: openSM: Different IB MTUs

[Shirley Ma]

Hal,

      Thanks for your prompt reply. I am asking for how openSM handle
different link MTUs in SA MCMemberRecord MTU. For example, if we have some
links MTU as 2K, some links MTU as 1K. Then when enabling IPoIB, how does
SM decide IPoIB broadcast group MCMemberRecord MTU size? When creating an
IB multicast group from a 2K MTU node first, which PMTU value is attaching
to this IB multicast group MCMemberRecord MTU?

Thanks
Shirley Ma



                                                                           
             "Hal Rosenstock"                                              
             <hal.rosenstock at g                                             
             mail.com>                                                  To 
                                       Shirley Ma/Beaverton/IBM at IBMUS      
             07/25/07 10:57 AM                                          cc 
                                       general at lists.openfabrics.org       
                                                                   Subject 
                                       Re: openSM: Different IB MTUs       
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




Shirley,

On 7/25/07, Shirley Ma <xma at us.ibm.com> wrote:
  Hello Hal,

  How does openSM handle CAs with different MTUs in the same subnet? For
  example, IPoIB broadcast group MTU, IB multicast group PMTU? Does openSM
  pick up the smallest MTU in the subnet?



Are you asking about link MTU, SA PathRecord/MultiPathRecord MTU, SA
MCMemberRecord MTU, or all of these ?

-- Hal

  Thanks
  Shirley Ma




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