User guide

PCoIP Technology User Guide
20
The administrator can improve fairness by using
the Administrative Web Interface to set the
Device Bandwidth Target.
Example: Target Bandwidth Example
Here’s a simplified example of how the Device
Bandwidth Target setting works. The example
uses this scenario:
• Four users sharing a 100 Mbps link
• All users constantly active, using graphically-
intensive applications (approximately 60% of
display continually changing)
• Device Bandwidth Limit set to 0 Mbps (PCoIP
Technology adjusts bandwidth use depending
on congestion, to let users take advantage of
unused bandwidth)
• Bandwidth measured over 60 minutes at 5
second intervals
The examples below show what happens when
different Device Bandwidth Target setting are
used: 0 Mbps (no Target), 20 Mbps, 25 Mbps,
and 30 Mbps.
Device Bandwidth Target: 0 Mbps (no Target)
The figure below shows 4 users sharing a 100
Mbps link. Each user has Device Bandwidth
Target set to 0 Mbps (no Target).
Figure 8-1: Device Bandwidth Target: 0 (no
Target)
In the figure above, we can see:
• Many dips below 17 Mbps
• Obviously “unfair” network bandwidth use
(some users left with lower bandwidths)
Device Bandwidth Target: 20 Mbps
Now users have the Device Bandwidth Target
set to 20 Mbps.
Figure 8-2: Device Bandwidth Target: 20
Mbps
We now see:
• Bandwidth use clamps at 20 Mbps
• No user below “fair” bandwidth more than 20%
of the time
25 Mbps Device Bandwidth Target
The bandwidth parameters are now updated so
each user has the Device Bandwidth Target of
25 Mbps.
Figure 8-3: Device Bandwidth Target: 25
Mbps
We now see:
• 25 Mbps per connection is the network
capacity (100 Mbps / 4 users)
• Congestion management keeps bandwidth
tight around 25 Mbps
• Some dips down to 19 Mbps
Device Bandwidth Target: 30 Mbps
Finally, each user has the Device Bandwidth
Target configured to 30 Mbps.