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RE: MTU greater than rcv.wnd

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  • Kacheong Poon
    ... In this particular case, receive window is less than 1*MTU, smaller negotiated MSS may actually help. With big MSS, if a segment is lost, the only way to
    Message 1 of 7 , Oct 29, 1998
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      > Small MTU will reduce performance somewhat because of overhead.

      In this particular case, receive window is less than 1*MTU, smaller negotiated
      MSS may actually help. With big MSS, if a segment is lost, the only way to
      recover that is a timeout. But if MSS is smaller, multiple segments can be
      sent. This means that fast retransmit can happen. Since RTO is usually
      bigger than RTT (in BSD's case, it can be much bigger), this definitely helps
      in recovery. But the MSS has to be small enough to allow at least 4 segments
      to be sent in a window.

      K. Poon.
      kcpoon@...
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