Appendix G: 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.
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 pkt/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 is 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 are possible target and network metrics; however, every environment is different.
Example appliance KVM sessions in a 100 mbps LAN environment:
The following metrics represent the KVM window resolution 1280x1024 @70 Hz on a Windows server:
• Zero screen movement = 0 pkts/sec (avg. 0.7 kbps download | 0.5 kbps upload)
• Continuous mouse circles movement on screen = 35 pkts/sec (avg. 216 kbps download | 247
kbps upload)
• Rapidly opening and closing full-screen windows = 35-100 pkts/sec (~ 2.9 mbps download | 257
kbps upload)
The following metrics represent the KVM window resolution 1024x768 @70 Hz on a Windows server:
• Zero screen movement = 0 pkts/sec (avg. 0.9 kbps download | 0.4 kbps upload)
• Continuous mouse circles movement on screen = 30 pkts/sec (avg. 212 kbps download | 246
kbps upload)
• Rapidly opening and closing full-screen windows = 30-70 pkts/sec (avg. 2.5 mbps download |
230 kbps upload)
The following metrics represent the KVM window resolution 1024x768 @60 Hz on a Ubuntu desktop:
• Zero screen movement = 0 pkts/sec (avg. 1.3 kbps download | 1.0 kbps upload)
• Continuous mouse circles movement on screen = 30 pkts/sec (avg. 470 kbps download | 245
kbps upload)
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