Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Reexamination Certificate
2005-12-14
2010-06-15
Mills, Donald L (Department: 2462)
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via time channels
C370S508000, C370S519000
Reexamination Certificate
active
07738500
ABSTRACT:
A host computer running a TCP connection transfers the connection to a TCP offload network interface device (NID) which performs certain network processes, thereby reducing the load on the host CPU. The NID later transfers the connection back to the host. The host and the NID maintain separate timestamp clocks which provide timestamp values for connections using the TCP Timestamp option. Synchronization of the host and NID timestamp clocks can be realized by transfer of a clock value. The NID or host receives the transferred TCP connection and the transferred clock value, and decides whether to update its own clock to equal the transferred clock value, the decision being guided by the requirement to never allow the timestamp clock to run backward. Acceleration of the timestamp clocks is prevented so that RTT measurements are accurate. Synchronization of the host and NID timestamp clocks improves performance and reduces erroneous connection drops.
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Jones James Gregory
Philbrick Clive M.
Alacritech, Inc.
Lauer Mark
Mills Donald L
Russell Wanda Z
Silicon Edge Law Group LLP
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