[ewg] Re: [ofa-general] Re: [PATCH] Request For Comments:

[Steve Wise]

Roland Dreier wrote:
>  > > I'm just trying to define the scope of the issue here... so is there any
>  > > conceivable real-life situation where neither a 0B read nor a 0B write
>  > > would work, and the connection setup will have to use a 0B send?
>
>  > i'm not sure what you mean by "real-life".  For the rnics we have:
>  > 
>  > nes - requires 0b write
>  > cxgb3 - requires 0b read
>  > amso1100 - won't work in p2p mode
>  > 
>  > So there are none that I know of that require a send for this.
>
> I guess my question was whether we expect to ever need to worry about
> the 0B send case, or whether it's just theoretical.  If no current NICs
> have a problem with read or write, and future NICs will be built to a
> future MPA spec, then it seems we don't have to worry about what happens
> if a 0B send is done as part of connection setup.
>
>   
I agree.  We can dump the 0B send stuff. 
> The spurious CQE on connection failure and the private data breakage are
> serious obviously.  The interoperability issues of this stuff seem
> pretty painful to me.
Its is painful.  But without anything, you cannot run OMPI, IMPI or 
HPMPI on a iwarp cluster with mixed vendor rnics...



Steve.