Oversubscription buffer management

摘要

Various methods and systems are provided for oversubscription buffer management. In one embodiment, among others, a method for oversubscription control determines a utilization level of an oversubscription buffer that is common to a plurality of ingress ports and initiates adjustment of an ingress packet rate of the oversubscription buffer in response to the utilization level. In another embodiment, a method determines an occupancy level of a virtual oversubscription buffer associated with an oversubscription buffer and initiates adjustment of an ingress packet rate in response to the occupancy level. In another embodiment, a rack switch includes an oversubscription buffer configured to receive packets from a plurality of ingress ports and provide the received packets for processing by the rack switch and a packet flow control configured to monitor an occupancy level of the oversubscription buffer and to initiate adjustment of an ingress packet rate in response to the occupancy level.

主权项

1. A method for oversubscription control of a rack switch, the method comprising:
receiving a packet through one of a plurality of ingress ports of the rack switch from a source; providing the packet to an oversubscription buffer of the rack switch that is common to the plurality of ingress ports; providing a copy of the packet to a virtual oversubscription buffer; monitoring an occupancy level of the virtual oversubscription buffer to determine a utilization level of the oversubscription buffer; comparing, by circuitry of the rack switch, the occupancy level of the virtual oversubscription buffer with a utilization threshold; configuring, by the circuitry, a congestion notification of a subsequent packet provided to the oversubscription buffer from the source when the occupancy level of the virtual oversubscription buffer is equal to or exceeds the utilization threshold; transmitting, by the circuitry, the congestion notification to the source of the subsequent packet; and providing, by the circuitry when the occupancy level of the virtual oversubscription buffer is equal to or exceeds the utilization threshold, the subsequent packet to a destination that is configured to transmit an acknowledgement of the subsequent packet to the source, the acknowledgement including an indication of the congestion notification, wherein the congestion notification indicates that congestion is present in the oversubscription buffer.