ASP.NET Settings

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In the .NET configuration file for your Web application - web.config or machine.config- there are several attributes that can affect the performance of large uploads. To set these attributes at the machine level, modify machine.config (located in [windows directory]\Microsoft.NET\Framework\[.NET Version Directory]\CONFIG). To set the attributes at the application level, modify your application's web.config file.

You will find the following values in the httpRuntime node of machine.config:

• executionTimeout
  Time in seconds before a request is timed out.



• maxRequestLength
  Maximum request size in kilobytes that ASP.NET will accept.



• appRequestQueueLimit
  Maximum number of requests queued for an ASP.NET application. The default value of appRequestQueueLimit is 100. If your server will be handling more than 100 concurrent requests, increase the value of appRequestQueueLimit.

The following attributes are in the processModel node of machine.config:

• responseDeadlockInterval
  Specifies the time interval, in the format HH:MM:SS, after which the process will be restarted if the following conditions are met:
  • There are queued requests.
  • There has not been a response during this interval.
  The default value of responseDeadlockInterval is 3 minutes. To allow very large uploads, you may have to increase this value. This property must be set in machine.config, not at the application level in web.config. It will affect any response deadlock in ASP.NET and should be used with caution.



• responseRestartDeadlockInterval

Specifies the time, in the format HH:MM:SS, that must elapse after the last restart to cure a deadlock before the process is restarted to cure a deadlock again. This prevents thrashing on processes that require a relatively long startup time. The default value of responseRestartDeadlockInterval is 9 minutes. To allow very large uploads, you may have to increase this value. This property must be set in machine.config, not at the application level in web.config. It will affect any response deadlock in ASP.NET and should be used with caution.


• maxIoThreads

Maximum number of IO threads per CPU in the thread pool. The default value of maxIoThreads is 25. Increasing this value will increase the number of concurrent executing requests, significantly reducing the amount of time it takes to process concurrent requests. This value is particularly important for large uploads using the HttpModule. If you expect many concurrent uploads to your site, you should set maxIoThreads to the number of concurrent uploads that you wish to support.

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