Performance Tuning: Latency

Use this procedure to tune your AccelePort device driver for reduced latency in Novell NetWare. For general information about latency, see About Latency.

Latency can be reduced in the AccelePort driver by incrementally adjusting the interrupt polling period downward from its default value of 5 milliseconds until the desired latency is achieved. 

Procedure

1. Use a text editor to open the device driver initialization file,
   /system/digiintl/dgdxb.ini.
2. Find the string that sets the interrupt polling period, in milliseconds. It will be of the form:

   AXP_INTR_PERIOD=5

3. Edit this string, changing the 5 to 4, as shown below. 

   AXP_INTR_PERIOD=4

4. Save the changed file.
5. Restart Novell NetWare to effect the change.
6. Verify the new interrupt polling period by entering the following command:

   dxbutil status

7. If the latency is still too great, continue adjusting the interrupt polling period downward (1 millisecond is the shortest supported polling period) until an acceptable latency is achieved.