Article ID: 834350
Article Last Modified on 12/1/2007
APPLIES TO
- Microsoft Windows XP Professional
- Microsoft Windows XP Professional x64 Edition
SYMPTOMS
On a Microsoft Windows XP-based computer, you may experience slower access to network resources than you experience on a Microsoft Windows 2000-based computer. For example, if you run a Microsoft Access database front-end program on a Windows XP-based computer, this program may access the back-end database slower than when the same Access program runs on a Windows 2000-based computer.
CAUSE
This problem occurs if the network-based files use the long file-name syntax instead of the 8.3 short file-name syntax. Specifically, the Windows XP Server Message Block (SMB) redirector component does not cache path information from long file names. In this scenario, Windows XP sends two SMB packets for every GetFileAttributes function call.
RESOLUTION
Important This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows Registry
Service pack information
To resolve this problem, obtain the latest service pack for Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
322389 How to obtain the latest Windows XP 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 XP service pack that contains this hotfix.
To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:
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.
Prerequisites
You must have Windows XP Service Pack 1 installed to apply this hotfix. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
322389 How to obtain the latest Windows XP service pack
Restart requirement
You must restart your computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace any other hotfixes.
File information
The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
Windows XP 32-bit editions
Date Time Version Size File name -------------------------------------------------------------- 07-Jul-2004 02:25 5.1.2600.1547 92,160 Cscdll.dll 07-Jul-2004 02:15 5.1.2600.1551 426,112 Mrxsmb.sys 07-Jul-2004 02:15 5.1.2600.1547 166,016 Rdbss.sys
Windows XP 64-bit editions
Date Time Version Size File name --------------------------------------------------------------------------- 07-Jul-2004 03:29 5.1.2600.1547 237,056 Cscdll.dll IA-64 SP1QFE 07-Jul-2004 02:19 5.1.2600.1551 1,287,552 Mrxsmb.sys IA-64 SP1QFE 26-Jun-2004 13:48 5.1.2600.1547 495,616 Rdbss.sys IA-64 SP1QFE 07-Jul-2004 03:25 5.1.2600.1547 92,160 Wcscdll.dll x86 WOW
Important In addition to installing the above hotfix, you must add the following information to the registry to resolve this problem. To do so, use the following steps:
- Click Start, click Run, type Regedit in the Open box, and then click OK.
- Locate and click the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MrxSmb\Parameters - Click Edit, click New, and then click DWORD value.
- Type InfoCacheLevel to replace New Value #1, and then press ENTER.
- Click the InfoCacheLevel DWORD value in the right pane, click Edit, and then click Modify.
- Under Value data, select hexadecimal and type 10, and then click OK.
- Quit Registry Editor.
Note InfoCacheLevel can have any of the following values in hexadecimal notation. The default value is 1.- 0 = Disables the caching for all files and folders
- 1 = Enables the caching for files with short file name (8.3) - default value
- 10 = Enables caching for all files
WORKAROUND
To work around this problem, use the 8.3 naming syntax to rename your networked files.
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
MORE INFORMATION
For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
Keywords: kbhotfixserver kbqfe kbwinxpsp2fix kbwinxppresp2fix kbfix kbbug KB834350
