RE: Connected mode draft and retransmit implosion

> From: bill [mailto:[email protected]]
> Sent: Friday, August 13, 2004 4:57 PM
> 
> Vivek,
> 
> So I have been concerned about the Connected mode draft and I run into a
> simple problem here...
> 
> Imagine I have a TCP socket running over a 64K RC MTU link.
> 
> I transmit the IP packet (all 64K of it)
> 
> Infiniband breaks the packet up into a bunch of 2K Infiniband MTU
> packets (all 32 of them) - lets say I loose the second packet.
> 
> No problem IB will retransmit the packet over the link and it gets to
> the other side...
> 
> The problem that I want to see - is what happens if the TCP retransmit
> timer goes off - causing the whole TCP segment to be retransmitted.

Wouldn't you end up with the same packet getting sent twice?  If so, why is
this problematic (aside from the inefficiency)?

- Fab