> The previous solution for IPC that Oracle was using was based on UDP,
quoted text
> which I think could be considered very close to using raw sockets --
> each process is responsible for its own acks, retransmits, everything.
> Doing this on a highly loaded machine resulted in a cascade where
> performance got worse and worse.

Could you describe that cascade in more detail? 

The problem was that the retransmits didn't have high enough priority? 

quoted text
> Additionally, our interconnect is primarily Infiniband. It natively
> implements a reliable datagram connection type so RDS leverages that.

So perhaps it would make more sense to have a thin direct interface
to that IB service? Or perhaps it already exists? (I admit I don't know
the IB interfaces very well) 

-andi

-- 
ak@linux.intel.com -- Speaking for myself only.
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