Red ghosts virtually eliminate delayed reactionto packet loss

Details Red ghosts virtually eliminate delayed reactionto packet loss Red ghosts virtually eliminate delayed reactionto packet loss

H - Electricity

04

L

H04L 12/56 (2006.01)

Patent

CA 2361687

The method for managing multiple flows through a communications de- vice includes maintaining a list of "ghost" flows. Any packet subject to dis- card due to an active queue management scheme like RED (Random Early Detection) is first checked against the ghost list. A non-ghost packet is discarded and a new entry is created in the ghost list. Ghost packets are discarded in proportion to their visibility, initially 1/2. The flow is removed from the list after one round trip time (perhaps when the lost packet is re- transmitted). The ghost list compensates for the delay between the time a packet is discarded and the time the packet's source receives notification of this loss through duplicate acknowledgements and consequently halves its transmission window. This reduces excess packet loss and resulting oscil- lations in the queue size, unnecessary packet delay variation and variable loss rates. The method may include a ghost queue size calculated by under- counting ghost packets for use in any RED scheme. The ghost queue size represents the length of the queue as it should have been if there was no delay.

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