Deciding To Tune Buffers - Dell S4820T Configuration Manual

• Oversubscription ratio = 10
• Dynamic Cell Limit Per port = 59040/29 = 2036 cells
Figure 142. Buffer Tuning Points

Deciding 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 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.
To define, change, and apply buffers, use the following commands.
• Define a buffer profile for the FP queues.
CONFIGURATION mode
buffer-profile fp fsqueue
• Define a buffer profile for the CSF queues.
CONFIGURATION mode
S-Series Debugging and Diagnostics
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