Dynamic queue memory allocation with flow control

Details Dynamic queue memory allocation with flow control Dynamic queue memory allocation with flow control

2011-07-05

2011-07-05

Shah, Chirag G (Department: 2477)

Multiplex communications

Data flow congestion prevention or control

C370S412000

Reexamination Certificate

active

07974190

ABSTRACT:
A method in an Ethernet controller for allocating memory space in a buffer memory between a transmit queue (TXQ) and a receive queue (RXQ) includes allocating initial memory space in the buffer memory to the RXQ and the TXQ; defining a RXQ high watermark and a RXQ low watermark; receiving an ingress data frame; determining if a memory usage in the RXQ exceeds the RXQ high watermark; if the RXQ high watermark is not exceeded, storing the ingress data frame in the RXQ; if the RXQ high watermark is exceeded, determining if there are unused memory space in the TXQ; if there are no unused memory space in the TXQ, transmitting a pause frame to halt further ingress data frame; if there are unused memory space in the TXQ, allocating unused memory space in the TXQ to the RXQ; and storing the ingress data frame in the RXQ.

REFERENCES:
patent: 6762995 (2004-07-01), Drummond-Murray et al.
patent: 7366802 (2008-04-01), Seto
patent: 7733894 (2010-06-01), Giacobbe et al.
patent: 2009/0043984 (2009-02-01), Chang et al.
“High Performance Single-Chip 10/100 Non-PCI Ethernet Controller,” SMSC LAN9118 Data Sheet, pp. 1-129.

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