RE: Connected mode draft and retransmit implosion

Yes, that is exactly the problem... Both layers retransmitting at the
same time

And possibly not recovering for quite a while
Bill

> -----Original Message-----
> From: [email protected] 
> [mailto:[email protected]] On Behalf Of Fab Tillier
> Sent: Friday, August 13, 2004 5:42 PM
> To: 'bill'; [email protected]
> Subject: RE: [Ipoverib] 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
> 
> 
> 
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