Decide To Tune Buffers; Using The Buffer Tuning Commands - Dell Z9000 Configuration Manual

Decide to Tune Buffers

Dell Networking recommends exercising caution when configuring any non-default buffer settings, as
tuning can significantly affect system performance. The default values work for most cases.
As a guideline, consider tuning buffers if traffic is very bursty (and coming from several interfaces). In this
case:
• Reduce the dedicated buffer on all queues/interfaces.
• Increase the dynamic buffer on all interfaces.
• Increase the cell pointers on a queue that you are expecting will receive the largest number of
packets.

Using the Buffer Tuning Commands

To tune the buffer, use the following commands.
NOTE: Buffer profile queue 1 is not supported. Use default buffer profile queue 4.
• Define a buffer profile for the FP queues.
CONFIGURATION mode
buffer-profile fp fsqueue
• Define a buffer profile for the CSF queues.
CONFIGURATION mode
buffer-profile csf csqueue
• Change the dedicated buffers on a physical 1G interface.
BUFFER PROFILE mode
buffer dedicated
• Change the maximum number of dynamic buffers an interface can request.
BUFFER PROFILE mode
buffer dynamic
• Change the number of packet-pointers per queue.
BUFFER PROFILE mode
buffer packet-pointers
• Apply the buffer profile to a line card.
CONFIGURATION mode
buffer fp-uplink linecard
• Apply the buffer profile to a CSF to FP link.
CONFIGURATION mode
buffer csf linecard
Z-Series Debugging and Diagnostics
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