Maintaining counters and updating a secondary counter storage

Details Maintaining counters and updating a secondary counter storage Maintaining counters and updating a secondary counter storage

2008-06-24

2008-06-24

Kizou, Hassan (Department: 2619)

Multiplex communications

Data flow congestion prevention or control

Reexamination Certificate

active

07391721

ABSTRACT:
Disclosed are, inter alia, methods, apparatus, data structures, computer-readable media, and mechanisms for maintaining counters, such as in, but not limited to a packet switching system, and updating a secondary counter storage based on values of the counters and entries in an overflow buffer. Multiple counter values are stored in a counter bank. An indication of a particular counter of the multiple counters to update is received. A current value of the particular counter is updated in the counter bank, and if an overflow condition results, then an indication of the particular counter is added to an overflow buffer. Periodically each of the multiple counters are visited and corresponding values are updated in a secondary storage, and each entry is retrieved from the overflow buffer and a corresponding value is updated in the secondary storage.

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Shah et al., “Maintaining Statistics Counters in Router Line Cards,” IEEE Micro, pp. 76-81, Jan.-Feb. 2002.

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