Appendix H: KVM Session Optimization
To improve session performance:
In the KVM Video Viewer, click Tools-Automatic Video Adjustment to calibrate the A/D converter to the
video signal coming from the server video card.
1. To identify a KVM session that is slow due to unclean video signals, click Tools-Manual Video
Adjustment. A clean video signal will create 0 Pkts/Sec. on the performance monitor when
there is not any activity on the target server.
NOTE: Adjusting the screen resolution and screen refresh rate can have a significant effect on the
cleanliness of the video signal and the speed of the resulting KVM session. For best results, try
different combinations of these two settings followed by an auto video adjustment to improve the
session speed.
The amount of video input plays a big role in the speed of KVM sessions. Lower screen resolutions will be
faster than higher screen resolutions. Decreasing the color depth and the screen scaling will also
decrease the amount of KVM session data being transported and will increase session speed.
If the above optimization options are ineffective at improving session speeds, the Video Noise
Control setting can be enabled, which will increase session speed by ignoring small video changes.
Other settings can also be configured for KVM targets globally or individually to improve
performance.
NOTE: While this setting can increase speed, it can also cause an increase in video "blocks".
The following is an example of possible target and network metrics. However, every environment is
different and you may not see the same results.
Appliance KVM session in a 100mbps LAN environment:
• KVM window resolution 1280x1024 @70hz (Windows Server)
• Zero screen movement = 0 pkts/sec (avg. 0.7kbps download | 0.5kbps upload)
• Continuous mouse circles movement on screen = 35 pkts/sec (avg. 216kbps download |
247kbps upload)
• Rapidly opening and closing full-screen windows = 35-100 pkts/sec (~ 2.9mbps download |
257kbps upload)
KVM window resolution 1024x768 @70hz (Windows Server)
• Zero screen movement = 0 pkts/sec (avg. 0.9kbps download | 0.4kbps upload)
• Continuous mouse circles movement on screen = 30 pkts/sec (avg. 212kbps download |
246kbps upload)
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