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Delay Buffer Size Allocation Methods

You can specify delay buffer sizes for each queue using schedulers. The queue buffer can be specified as a period of time (microseconds) or as a percentage of the total buffer or as the remaining buffer. Table 143 shows different methods that you can specify for buffer allocation in queues.

Table 143: Delay Buffer Size Allocation Methods

Buffer Size Allocation Method	Description
Percentage	A percentage of the total buffer.
Temporal	A period of time, value in microseconds. When you configure a temporal buffer, you must also configure a transmit rate. The system calculates the queue buffer size by multiplying the available bandwidth of the interface times the configured temporal value and transmit rate. When you specify a temporal method, the drop profile is assigned a static buffer and the system starts dropping packets once the queue buffer size is full. By default, the other buffer types are assigned dynamic buffers that use surplus transmission bandwidth to absorb bursts of traffic.
Remainder	The remaining buffer available. The remainder is the percentage buffer that is not assigned to other queues. For example, if you assign 40 percent of the delay buffer to queue 0, allow queue 3 to keep the default allotment of 5 percent, and assign the remainder to queue 7, then queue 7 uses approximately 55 percent of the delay buffer.

Buffer Size Allocation Method

Description

Percentage

A percentage of the total buffer.

Temporal

A period of time, value in microseconds. When you configure a temporal buffer, you must also configure a transmit rate. The system calculates the queue buffer size by multiplying the available bandwidth of the interface times the configured temporal value and transmit rate.

When you specify a temporal method, the drop profile is assigned a static buffer and the system starts dropping packets once the queue buffer size is full. By default, the other buffer types are assigned dynamic buffers that use surplus transmission bandwidth to absorb bursts of traffic.

Remainder

The remaining buffer available. The remainder is the percentage buffer that is not assigned to other queues. For example, if you assign 40 percent of the delay buffer to queue 0, allow queue 3 to keep the default allotment of 5 percent, and assign the remainder to queue 7, then queue 7 uses approximately 55 percent of the delay buffer.

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