HP MT40 User's Guide download pdf (Page 13)

HP Velocity Technology Overview 13

LiveTCP

Real-world IP networks introduce both latency and packet loss to application flows. A primary

cause of these issues is network congestion. TCP retransmits lost packets, providing

applications with guaranteed, correctly sequenced packet delivery. TCP also has built-in

algorithms to avoid excessive congestion of the network.

Both latency and packet loss degrade the end user QoE, especially for applications that use

TCP for reliable data transmission, such as video streaming, chat, remote desktop, and file

transfers. This results in unresponsive user interfaces for remote desktop users, extended wait

times for file transfers, and choppy video with reduced frame rates.

TCP congestion avoidance mechanisms

TCP is designed to send data as rapidly as possible until it detects packet loss. Once packet

loss is detected, TCP will guarantee delivery by retransmitting, halting delivery to preserve

ordered packet transmission, and reducing transmission speed. When packet loss dissipates,

TCP will again increase the speed of data delivery. The speed of data delivery might be

impacted by standard TCP.

TCP algorithms

TCP can be controlled by different algorithms to accommodate different types of networks.

However, only one network type at a time can be accommodated under native TCP. For

example, LANs are characterized by low packet loss and high bandwidth. Remote office

networks typically have high packet loss and high latency. WiFi networks have high jitter (the

latency is highly variable) and variable throughput capacity.

TCP Tuning

Most operating systems allow only a single TCP algorithm to be active with a single set of

settings. If a network is optimized for LAN traffic, WAN connections will be less efficient.

While the TCP stack can be tuned, the effort required by network administrators is a deterrent.

LiveTCP provides tuning automatically, which boosts TCP throughput over all networks and

provides latency mitigation for streaming applications.

LiveTCP congestion control

LiveTCP adapts its algorithm to automatically provide congestion control that is optimized

independently for each TCP flow (LAN, remote network, WiFi) and the conditions in the

network. LiveTCP achieves this without requiring any intervention from IT.

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HP MT40 User's Guide Page 13