From: rick.jones2@hp.com   
      
   Martijn Lievaart  wrote:   
   > On Thu, 26 Nov 2009 09:10:35 -0800, Ashwin Rao wrote:   
      
   > > Data payloads with length greater than the MSS negotiated are being   
   > > exchanged. I would like to know under which conditions are payloads   
   > > greater than the MSS exchanged? Further, is there a way to limit the   
   > > payloads to the specified MSS value?   
      
   > I've seen this happening with NICs that do tcp offloading.   
      
   Given that stateless offloads (CKO, TSO, LRO, etc (or "Little TOE"))   
   are more common than stateful (TOE or "Big TOE"), chances are it is a   
   "large send" taking advantage of TSO (Tcp Segmentation Offload) in the   
   NIC.   
      
   And when CKO (ChecKsum Offload) is being used you may also see   
   "invalid checksum" messages on the sending side out of tcpdump since   
   the checksum has been deferred to the NIC.   
      
   rick jones   
   --   
   The computing industry isn't as much a game of "Follow The Leader" as   
   it is one of "Ring Around the Rosy" or perhaps "Duck Duck Goose."   
                                                       - Rick Jones   
   these opinions are mine, all mine; HP might not want them anyway... :)   
   feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...   
      
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