Microsoft KB Archive/318871

= Problems Transferring Highly Fragmented Packets in NDIS =

Article ID: 318871

Article Last Modified on 2/21/2007

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APPLIES TO


 * Microsoft Windows 2000 Service Pack 1
 * Microsoft Windows 2000 Service Pack 2
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Service Pack 1
 * Microsoft Windows 2000 Service Pack 2

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This article was previously published under Q318871



SYMPTOMS
In NDIS miniport drivers that support Scatter-Gather DMA, the SendPackets handler is not called if the packet that is sent by the protocol driver contains more than a certain number of scatter-gather elements. For example, if the miniport driver specifies the MaximumPhysicalMapping value to be 64 KB in its call to NdisMInitializeScatterGatherDma, NDIS can call the SendPackets handler if the total scatter-gather elements of the packet buffers are not more than 33 elements. If you increase the MaxiumPhyscialMapping value to 128 KB, the limit increases to 62 elements.



CAUSE
This limitation is caused by a problem in NDIS in Windows 2000.



Service Pack Information
To resolve this problem, obtain the latest service pack for Microsoft Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack

Hotfix Information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows 2000 service pack that contains this hotfix.

To resolve this problem immediately, 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/contactus/?ws=support

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 typical 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 09-Apr-2002 20:30  5.0.2195.5557 164,240  Ndis.sys



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Microsoft Windows 2000 Service Pack 4.



MORE INFORMATION
For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the article number below to view the article in the Microsoft Knowledge Base:

265173 The Datacenter Program and Windows 2000 Datacenter Server Product

For additional information about how to install multiple hotfixes with only one reboot, click the article number below to view the article in the Microsoft Knowledge Base:

296861 Use QChain.exe to Install Multiple Hotfixes with One Reboot

Keywords: kbbug kbfix kbkmode kbwin2000presp3fix kbwin2000presp4fix kbqfe kbwin2000sp3fix kbnetwork kboswin2000fix kbwin2ksp4fix kbhotfixserver KB318871

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