Network procedures

The Tx-ring is especially important on ATM links (including DSL), in which each PVC has a dedicated driver-level queue (Tx-ring) to ensure adherence to the ATM class-of-service traffic contract of the PVC. Default ATM Tx-rings are typically deep, containing 64 or more particles (typically, each particle is 576 bytes) to ensure that enough particles exist in the buffer to drive the PVC to its full bandwidth utilization. A shallow Tx-ring increases the number of interrupts and the wait states between the driver and the main CPU. Packets are downloaded from the Layer 3 queues to the driver for transmission, which is usually suboptimal at higher speeds.
On the other hand, a deep network procedures can impact voice quality. For example, assume that a 50-packet burst of data passes through the LLQ system and into the FIFO Tx-ring. A voice packet then arrives and is packet number 51 for transmission. The LLQ no longer has the opportunity to prioritize it over the data packets. A shallow Tx-ring pushes packets back into LLQ, where prioritization and packet reordering can be accomplished before the packets are downloaded to the driver. Once in the driver level, the packets have a very short wait time until transmission.

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Software assets

Link Fragmentation and Interleaving (LFI) is a software assets technique to minimize serialization delay on slow (typically less than 768-kbps) WAN links. Essentially, LFI tools chop large data packets into smaller ones and interleave these data packet fragments with voice packets.
Packets that are assigned to the PQ inside LLQ might escape the fragmentation engine (the fragmentation engine is represented by the box labeled fragment). Therefore, traffic with large packet sizes (such as interactive video) should not be assigned to priority classes on slow-speed links (typically less than 768 kbps). For example, if one priority class is assigned to VoIP and another is assigned to interactive video on a 512-kbps link, whenever a 1500-byte video packet is scheduled for transmission, it will require 23 ms to serialize ((1500 x 8) / 512,000). This exceeds the per-hop latency target for voice (10 ms) and nearly consumes the entire one-way jitter allowance target of 30 ms. If a second 1500-byte IP/VC packet also is scheduled for transmission, voice conversations audibly will become degraded. Therefore, voice and interactive video never should be assigned dual-LLQ policies on link speeds less than 768 kbps.

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