Monitoring and Tuning Your Server
Monitoring and Tuning Your Server |
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You can sometimes effectively increase existing bandwidth by increasing the length of the connection queues. Requests for connections to IIS 5.0 services are held in queues until the service is available to respond to the request. A separate queue exists for each of the IIS 5.0 services, but all queues have the same maximum size. By default, each queue can hold up to 15 connection requests. If the queue to a service is full, any new connection requests are rejected.
The default queue length of 15 connection requests is sufficient for most servers. However, if your server is rejecting many requests when the services are most active, you can increase the maximum number of items in the queue. If you change the queue length, be sure to monitor server processor use, server memory use, and the connection counters to avoid creating a system bottleneck.
To change the maximum number of connection requests in the queue for each IIS 5.0 service, add the ListenBackLog key to the registry. Set the value of ListenBackLog to the maximum number of connection requests you want the server to maintain. You must place Listen_Back_Log in the registry at:
HKEY_LOCAL_MACHINE
\System
\CurrentControlSet
\Services
\Inetinfo
\Parameters
Caution Do not use a registry editor to edit the registry directly unless you have no alternative. The registry editors bypass the standard safeguards provided by administrative tools. These safeguards prevent you from entering conflicting settings or settings that are likely to degrade performance or damage your system. Editing the registry directly can have serious, unexpected consequences that can prevent the system from starting and require that you reinstall Windows 2000. To configure or customize Windows 2000, use the programs in Control Panel or Microsoft Management Console (MMC) whenever possible.