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Q152453: Directhosting Affects Powerbuilder Query Performance

Article: Q152453
Product(s): Microsoft Windows NT
Version(s): 3.11 3.51 95
Operating System(s): 
Keyword(s): 
Last Modified: 09-AUG-2001

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The information in this article applies to:

- Microsoft Windows NT Workstation version 3.51 
- Microsoft Windows NT Server version 3.51 
- Microsoft Windows for Workgroups version 3.11 
- Microsoft Windows 95 
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SYMPTOMS
========

Powerbuilder client server applications that utilize the IPX/SPX Compatible
Protocol (NWLINK) running under Windows for Workgroups or Windows 95 may
experience a performance problem. The query from this client against SQL Server
running under Windows NT may take a long time to process. Other similar types of
applications may encounter the same problem.

CAUSE
=====

Because the DIRECTHOST feature only supports half-duplex communication (only one
command outstanding on the IPX session at a time), this feature causes a
decrease in perfomance with network applications that use named pipes to
connect.

RESOLUTION
==========

Disable the DIRECTHOST feature.

Steps to disable the feature in Windows for Workgroups:

1. Open System.ini.

2. Goto the [NETWORK] section.

3. Add a line: DIRECTHOST=NO

This change will take effect when you next start Windows for Workgroups.

Steps to disable the feature in Windows 95:

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.

1. Click the Start button, then click Run. The Run dialog box appears.

2. Type "regedit" and choose OK. Registry Editor starts.

3. Open (click on the + next to) HKEY_LOCAL_MACHINE, the go to the following
  subkey:

  System\CurrentControlSet\Services\Vxd

4. Open (click on the + next to) HKEY_LOCAL_MACHINE, then open System,
  CurrentControlSet, Services, and then finally open VxD.

5. Select VNETSUP.

6. On the Edit menu, select New, then choose String Value. A new value appears
  in the right-hand pane.

7. If necessary, right click on the new item and choose Rename from the context
  menu. Type DirectHost and press ENTER.

8. Right click on DirectHost and choose Modify. The Edit String dialog appears.

9. Type 0 (zero) and click OK.

10. Click Registry, then Exit to end the Registry Editor.

This change will take effect when you next start Windows 95

Additional query words: crawl slow

======================================================================
Keywords          :  
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNT351search kbWinNTW351search kbWinNTW351 kbWinNTSsearch kbWinNTS351 kbWinNTS351search kbAudDeveloper kbWin95search kbWFWSearch kbZNotKeyword3 kbWFW311
Version           : 3.11 3.51 95

=============================================================================

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