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PCoIP Technology User Guide (Vol I)

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.

TER0806003 Issue 1

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.

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