Dell Precision R5400 Manual - Page 19

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Dell Precision R5400 Manual
PCoIP Technology User Guide (Vol I)
Addressing Fairness
One issue in network usage is fairness, or the
fair sharing of the network resources. Without
control, some users may end up getting a larger
share of network bandwidth than other users.
The administrator can improve fairness by
configuring Device Target Bandwidth, e.g.
through the Administrative Interface.
Target Bandwidth Example
This section outlines a simplified example of
configuring Device Bandwidth Target to improve
fairness. The following parameters are
considered:
• Four users sharing a 100 Mbps link
• All users constantly active using graphically
intensive applications (approx. 60% of display
changing)
• Device Bandwidth Limit set to 0 Mbps (i.e.
PCoIP Technology adjusts bandwidth usage
depending on congestion to allow users to
take advantage of unused bandwidth when
available)
• Bandwidth measured over 60min at 5sec
intervals
• Device Bandwidth Target settings: No (0
Mbps, 20 Mbps, 25 Mbps and 30 Mbps
No Device Bandwidth Target
The figure below shows 4 users sharing a 100
Mbps link. Each user has the following
bandwidth configuration:
• Device Bandwidth Limit: 0 Mbps
• Device Bandwidth Target: 0 Mbps
Figure 15: No Device Bandwidth Target
From the figure above, we can see:
• Many dips below 17 Mbps
• Grossly "unfair" at times as some users
always 'stuck' with lower bandwidths
© 2008 Teradici Corporation
TER0806003 Issue 1
20 Mbps Device Bandwidth Target
Now each user has the following bandwidth
configuration:
• Device Bandwidth Limit: 0 Mbps
• Device Bandwidth Target: 20 Mbps
Figure 16: 20 Mbps Device Bandwidth Target
In the figure above, we now see
• Clamps at 20 Mbps
• No one more than 20% of the time below "fair"
usage
25 Mbps Device Bandwidth Target
The bandwidth parameters are now updated so
each user has the following bandwidth
configuration:
• Device Bandwidth Limit: 0 Mbps
• Device Bandwidth Target: 25 Mbps
Figure 17: 25 Mbps Device Bandwidth Target
With Device Bandwidth Target set to 25 Mbps,
we 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
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