Microsoft KB Archive/169225

= Slow Copying from WinNT to Win95 in Bus Mastering Mode =

Article ID: 169225

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows 95

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This article was previously published under Q169225



SYMPTOMS
When you use IPX protocol in a computer with the network adapter card running in either Bus Mastering Mode or Slave Mode, throughput may be extremely low when attempting to pull (or copy) a file from a computer running Windows NT 4.0 to a computer running Windows 95 or OSR2.



MORE INFORMATION
This problem is not exhibited when attempting to pull a file the other way -- that is, attempting to pull a file from a computer running Windows 95 to a computer running Windows NT 4.0. Also, this problem is NOT exhibited when pulling files from a computer running Windows NT to a computer running Windows NT, or from a computer running Windows 95 to a computer running Window 95 or OSR2. Furthermore, this problem is NOT exhibited in any scenario in Windows NT 3.51.



On the Computer Running Windows 95
NOTE: For information about how to edit the registry in Windows 95, view the Changing Keys And Values online Help topic in Registry Editor (Regedit.exe). Note that you should make a backup copy of the registry files (System.dat and User.dat) before you edit the registry.

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall Windows 95. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

You can go into the Registry and enable Direct Hosting to speed up the transfer rate. Go to the following registry key:

  HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\Vnetsetup

Add the Binary Value "DirectHost," value set to 1.

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On the Computer Running Windows NT
WARNING: Using Registry Editor incorrectly can cause serious, system-wide problems that may require you to reinstall Windows NT to correct them. Microsoft cannot guarantee that any problems resulting from the use of Registry Editor can be solved. Use this tool at your own risk.

You can go into the Registry and enable Bus Mastering to speed up the transfer rate. Go to the following registry key:

  KEY_LOCAL_MACHINE\System\CurrentControlSet\Services\ \ Parameters

Click the Edit menu. Click Add value. Add the following information:

  VALUE NAME:   Busmaster DATA TYPE :  Reg_SZ VALUE    :   Yes



STATUS
Microsoft has confirmed this to be a problem in Windows NT version 4.0. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

Keywords: kbhowto KB169225

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