Dell Precision R5400 Remote Access Device: Task-Based User Guide  - Page 20

PCoIP Technology User Guide (Vol I) TER0806003 Issue 1 30 Mbps Device Bandwidth Target Finally, each user has the following bandwidth configuration: • Device Bandwidth Limit: 0 Mbps • Device Bandwidth Target: 30 Mbps Figure 18: 30 Mbps Device Bandwidth Target With Device Target Bandwidth set to 30 Mbps, we now have: • Device Target Bandwidth set too high • PCoIP Technology congestion management still operates, but is not optimized • Fairness better than with no target • Some dips down to 18 Mbps Bandwidth Optimization The example above shows a simplified example to understand bandwidth parameters. Device Bandwidth Target The bandwidth usage data above shows that for this simplified example, the PCoIP Systems are optimized when setting the Device Bandwidth Target to ensure fairness for all users. In this example the network link is 100 Mbps for four users, so the fair Device Bandwidth Limit is 25 Mbps (100 Mbps / 4 users). It must be noted that this example had four users continually active. This is not a realistic scenario, as even extremely active users will not have constantly changing displays (e.g. pause to study detail). It is reasonable to assume that each user would have periods of low bandwidth usage. This example also is a bit backwards as we begin with the network capacity (100 Mbps) and then find a 'fair' usage scenario. Although this was done to illustrate the bandwidth configuration features, a better strategy would be to determine the required bandwidth to meet users experience expectations and work towards the network capacity required. © 2008 Teradici Corporation Device Bandwidth Limit The above example has the Device Bandwidth Limit configured to allow the PCoIP Processors to manage bandwidth throttling (i.e. configured to 0 Mbps). This configuration is recommended for most usage cases unless the administrator requires limiting bandwidth usage. Examples scenarios are networking equipment that is unreliable when fully utilized or the requirement to put strict limits on user bandwidth usage. Constrained Network Effects In an environment that does not provide adequate bandwidth, PCoIP Technology will gracefully adjust. Depending on the resulting network congestion, some artifacts may be present, e.g.: • Image smearing and blocking artifacts may be present • Less responsive user interface, e.g. slower window movements with mouse, generally due to a decrease in the imaging update rate It is recommended to set the bandwidth limit at or below the limiting network link that the PCoIP data traverses. For example, if the PCoIP data traverses a 100 Mbps link (e.g. link to the desktop), the limit should not exceed 100 Mbps. Page 20 of 25