[openib-general] RFC: detecting duplicate MAD requests

[Hal Rosenstock]

On Wed, 2006-06-14 at 14:27, Sean Hefty wrote:
> Michael S. Tsirkin wrote:
> > Another concern with this approach: consider an application that accepts
> > incoming MAD requests and drops some of them.  With current code it can do this
> > safely and remote side will retry. With the duplicate tracking in umad module
> > that you propose, MAD will stay in the list forever, and application will never
> > again get called.
> 
> This is why I proposed a timeout for responses.
> 
> > This kind of subtle behaviour change seems to me worse than outright ABI
> > breakage.
> 
> If everyone is okay with breaking the ABI, then I would add send completion 
> notification to umad, and put the responsibility on callers not to generate 
> duplicate responses.

Is this a better architectural solution ?

I'm not sure I totally understand what the new ABI would be and its
impact on existing applications. Is there an example of what this might
look like ?

-- Hal

> - Sean
> 
> 
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