Is multicast only available with UD Transport mode?

Is multicast only available with UD Transport mode?

[ib-x2spCj9RiN0z5UmgcLIfJQ]

Is multicast only available with UD Transport mode?


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RE: Is multicast only available with UD Transport mode?

[Hefty, Sean]

> Is multicast only available with UD Transport mode?

yes
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RE: Is multicast only available with UD Transport mode?

[ib-x2spCj9RiN0z5UmgcLIfJQ]

According to a document I have, "RDMA Aware Networks Programming User  
Manual" from Mellanox, the max message size for UD is the MTU.  Is the  
MTU tweakable?  What are the limits of tweakability?

E


Quoting "Hefty, Sean" <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>:

>> Is multicast only available with UD Transport mode?
>
> yes
>



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Re: Is multicast only available with UD Transport mode?

[Steven Dake]

On 11/16/2010 10:09 AM, ib-x2spCj9RiN0z5UmgcLIfJQ@public.gmane.org wrote:
> According to a document I have, "RDMA Aware Networks Programming User
> Manual" from Mellanox, the max message size for UD is the MTU.  Is the
> MTU tweakable?  What are the limits of tweakability?
> 
> E
> 

Some systems have a network MTU of 2048 other cards/switches are 4096.
Don't forget you will need the header in the message which consumes some
of the MTU room available.

Regards
-steve

> 
> Quoting "Hefty, Sean" <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>:
> 
>>> Is multicast only available with UD Transport mode?
>>
>> yes
>>
> 
> 
> 
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Re: Is multicast only available with UD Transport mode?

[Bart Van Assche]

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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Re: Is multicast only available with UD Transport mode?

[Steven Dake]

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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