Dell PowerEdge FX2 Dell PowerEdge FN I/O Aggregator Configuration Guide 9.6(0 - Page 276
Buffer Tuning, OID String, OID Name, Description, Hardware MIB Buffer Statistics, Dedicated buffer
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OID String .1.3.6.1.4.1.6027.3.10.1.2.5.1.7 OID Name chSysPortXfpRecvTemp Hardware MIB Buffer Statistics .1.3.6.1.4.1.6027.3.16.1.1.4 fpPacketBufferTable .1.3.6.1.4.1.6027.3.16.1.1.5 fpStatsPerPortTable .1.3.6.1.4.1.6027.3.16.1.1.6 fpStatsPerCOSTable Description OID displays the temperature of the connected optics. NOTE: These OIDs only generate if you enable the enable optic-infoupdate-interval is enabled command. View the modular packet buffers details per stack unit and the mode of allocation. View the forwarding plane statistics containing the packet buffer usage per port per stack unit. View the forwarding plane statistics containing the packet buffer statistics per COS per port. Buffer Tuning Buffer tuning allows you to modify the way your switch allocates buffers from its available memory and helps prevent packet drops during a temporary burst of traffic. The application-specific integrated circuit (ASICs) implement the key functions of queuing, feature lookups, and forwarding lookups in hardware. Forwarding processor (FP) ASICs provide Ethernet MAC functions, queueing, and buffering, as well as store feature and forwarding tables for hardware-based lookup and forwarding decisions. 1G and 10G interfaces use different FPs. You can tune buffers at three locations 1. CSF - Output queues going from the CSF. 2. FP Uplink - Output queues going from the FP to the CSF IDP links. 3. Front-End Link - Output queues going from the FP to the front-end PHY. All ports support eight queues, four for data traffic and four for control traffic. All eight queues are tunable. Physical memory is organized into cells of 128 bytes. The cells are organized into two buffer pools - the dedicated buffer and the dynamic buffer. • Dedicated buffer - this pool is reserved memory that other interfaces cannot use on the same ASIC or by other queues on the same interface. This buffer is always allocated, and no dynamic re-carving takes place based on changes in interface status. Dedicated buffers introduce a trade-off. They provide each interface with a guaranteed minimum buffer to prevent an overused and congested interface from starving all other interfaces. However, this minimum guarantee means that the buffer 276 Debugging and Diagnostics