[ofa-general] Re: IPoIB forwarding

[Michael S. Tsirkin]

> Quoting Bryan Lawver <lawver1 at llnl.gov>:
> Subject: Re: IPoIB forwarding
> 
> Here's a tcpdump of the same sequence.  The TCP MSS is 8960 and it appears 
> that two payloads are queued at ipoib which combines them into a single 
> 17920 payload with assumingly correct IP header (40) and IB header 
> (4).  The application or TCP stack does not acknowledge this double packet 
> ie. it does not ACK until each of the 8960 packets are resent 
> individually.  Being an IB newbie, I am guessing this combining is 
> allowable but may violate TCP protocol.

IPoIB does nothing like this - it's just a network device so
it sends all packets out as is.

-- 
MST