Threshold (Util%)

The second condition is met if Bucket Utilization drops below the Threshold (Util%), which by default is 40%. The switch will compensate for the poor utilization by doubling the Hash Table. 40% is recommended for most applications.

Resizing results in the switch utilizing AFT memory more efficiently. When the switch resizes the Hash Table, all entries are flushed and must be relearned.

It is highly recommended the default of 40% not be changed. The affects of varying the Threshold (Util%) are as follows:

• Increasing Threshold: Gives better memory utilization at the expense of more frequent flushing, flooding, and relearning.
• Decreasing Threshold: Gives less efficient memory utilization but does not flush, flood and relearn as often.