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Using Quality of Service
You can enable these settings for the entire server or for a class of virtual servers in
the Server Manager from the Monitor tab. However, you can override these server
or class-level settings for an individual virtual server. For more information on
setting quality of service limits for an individual server, see "Configuring Virtual
Server Quality of Service Settings," on page 329.
Two settings govern how traffic is counted and how often the bandwidth is
recomputed: the recompute interval and the metric interval. The recompute is how
often (in milliseconds) the bandwidth is computed. The metric interval is the
period of time for which data is used in traffic calculations.
This section includes the following topics:
•
Quality of Service Example
•
Setting Up Quality of Service
•
Required Changes to obj.conf
•
Known Limitations to Quality of Service
Quality of Service Example
The following example shows how the quality of service information is collected
and computed:
The server has metric interval of 30 seconds.
The server starts up at a time of 0 seconds.
At time 1 second, an HTTP connection generates 5000 bytes of traffic to/from the
server.
No more connections are made after that. At 30 seconds, the total traffic for the last
30 seconds is 5000 bytes.
At 32 seconds, the traffic sample from 1 second is discarded, since it is older than
the 30 seconds of the metric interval. The total traffic for the last 30 seconds is now
0.
The recompute interval works similarly. The server's recompute interval is 100ms.
Continuing with the example, the bandwidth gets recomputed periodically every
100 milliseconds. The calculation is based on the amount of traffic as well as the
metric interval.
At time 0 seconds, the bandwidth is calculated for the first time. The total traffic is
zero, divided by the metric interval of 30 seconds, gives a bandwidth of zero.
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Netscape Enterprise Server Administrator's Guide • November 2001
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