***SPAM*** Re: [ofa-general] [RFC] dropping RDS over TCP support

[Jon Mason]

On Wed, Sep 03, 2008 at 12:48:53AM +0300, Or Gerlitz wrote:
> On Tue, Sep 2, 2008 at 11:04 PM, Andy Grover <andy.grover at oracle.com> wrote:
> 
> > We've been discussing dropping RDS's support for using TCP as a transport,
> > and just focusing on RDS as a IB and iWARP-focused protocol.
> 
> 
> do we have any results that compare Oracle IPC using rds/bcopy/tcp vs udp?
> 
> This would simplify the RDS codebase, allow easier inclusion of more
> > IB-centric features, and also give RDS an easier path towards mainline Linux
> > kernel inclusion. Also, the imminent RDS iWARP support will address non-IB
> > use cases.
> 
> 
> So just to make sure, do IB and iWARP  share the same transport code today?
> if yes, does removing TCP means the transport abstraction would not be
> needed any more, or you still want to maintain it for the loopback case?
> Generally speaking, the loopback transport also uses IB, correct? and if it
> doesn't I am quite sure it can.

Not all iWARP devices can do loopback, so having it done in the IB
specific code could be painful.  I believe there is a loopback module in
RDS which can handle this though.

> 
> I tend to agree with Jon that removing TCP might help with mainline
> inclusion or might create damage...
> 
> Roland, maybe you have more definitive intuitions re the netdev people
> potential feedback on rds as a new socket type applicable to RDMA cards such
> as IB and iWARP using a verbs/rdmacm native transport AND to non RDMA cards
> with TCP transport, vs the case of RDS being "just" a ULP under
> drivers/infiniband/ulps that defines a new socket type, etc.
> 
> 
> Or

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