Microsoft KB Archive/293841

= Non-Paged Pool Is Exhausted by Afd =

Article ID: 293841

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT 4.0 Service Pack 6a

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This article was previously published under Q293841



SYMPTOMS
Under certain circumstances, the heavy use of WinSock programs can cause non-paged pool memory to become exhausted. This behavior is likely to occur if the WinSock program is dealing with both Out-of-Band (MSG_OOB) and normal TCP traffic. This situation can cause various error messages, poor performance, and system hangs. Examples of possible error messages include:

Event ID: 2019

Source: Srv

Description: The server was unable to allocate from the system nonpaged pool because the pool was empty.

Event ID: 2000

Source: Srv

Description: The server's call to a system service failed unexpectedly.

Other events may not work and may generate status code 1450 (&quot;Insufficient System Resources&quot;).



CAUSE
If the WinSock program does not correctly post a Receive to collect the incoming data from WinSock, Afd may endlessly buffer the data and use up all non-paged memory. Afd should check the MaxBufferredReceiveBytes value for the socket and then not buffer more than this value.



RESOLUTION
A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix should have the following file attributes or later:

  Date     Time        Version        Size    File name  Platform ---  3/29/01  10:06:36PM  4.0.1381.7095  66,640  Afd.sys    Intel



WORKAROUND
To work around this issue, do not use MSG_OOB data in your WinSock program. Use a separate socket for urgent data.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.



MORE INFORMATION
You can observe this problem with Performance Monitor. Log the Non-Paged Pool Bytes item under Memory Object, and watch for the value to grow to 20-40 MB.

Keywords: kbhotfixserver kbqfe kbprb KB293841

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