User's Guide

3.6 Bandwidth Limiting
ClearCube Technology, Inc. 27
Setting Device Bandwidth Limit to 0 configures the PCoIP processor to adjust the bandwidth
depending on network congestion. If there is no congestion, there is no limit on bandwidth. That
is, the processor uses the maximum rate available.
We recommend setting this field to the limit of the network connected to the client and host.
NOTE: The setting in this field is applied immediately after you click Apply.
3.6.2 Device Bandwidth Target
The Device Bandwidth Target value defines the soft limit on the network bandwidth during
periods of congestion (packet loss). When network activity is high, the device bandwidth is
reduced rapidly to the target value and more slowly below this value. This behavior provides an
even distribution of bandwidth between users sharing a congested network link.
After congestion is alleviated, bandwidth use increases depending on the available network
resources up to the specified Device Bandwidth Limit.
Administrators should have a good understanding of the network topology before setting this to a
non-zero value.
The value you specify here is applied the next time a new session starts after you click Apply.
3.6.3 Device Bandwidth Floor
This setting enables you to configure the bandwidth floor used by the firmware when congestion
is present and when bandwidth is required. This lets you optimize performance for a network with
understood congestion or packet loss. If the bandwidth is not required, the bandwidth used drops
below the floor.
A setting of 0 lets the firmware reduce bandwidth to 1000 kbps for these network impairments. Be
sure to have a good understanding of your network topology before setting this to a non-zero value.
NOTE: The firmware implements a Slow Start Algorithm that:
 increases the bandwidth used until the bandwidth required is reached, network
congestion is detected, or the Device Bandwidth Limit is reached
 begins at the lesser of the Device Bandwidth Limit and 8000 kbps
 increases the bandwidth used within seconds
 allows a graceful session startup for low bandwidth scenarios (for example, WAN)
After initiating a PCoIP session, users may temporarily notice low bandwidth video artifacts as
the algorithm increases bandwidth usage.