Microsoft KB Archive/822253

= FIX: Increased Memory Usage After Heavy Network Traffic =

Article ID: 822253

Article Last Modified on 5/27/2005

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APPLIES TO


 * Microsoft Windows CE .NET 4.2

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SYMPTOMS
After a period of heavy network traffic, the memory usage can increase by 900 kilobytes (KB).

After the network traffic has decreased, the memory usage does not decrease.



CAUSE
The Cxport module includes common network transport support for allocating memory by using memory pools. Cxport keeps unused memory without releasing it so that it can handle memory requests efficiently. The threshold is 100000; this explains the 900 KB increase in the level of memory usage.



Hotfix Information
A supported software update is now available from Microsoft as Windows CE Platform Builder 4.2 Core OS QFE 030616_KB822253. To resolve this problem immediately, click the following article number for information about obtaining Windows CE Platform Builder and core operating system software updates:

837392 How to locate core operating system fixes for Microsoft Windows CE Platform Builder products

File Information
The English version of this package has the file attributes (or later) that are listed in the following table.   Date         Time   Version       Size    File name ---  16-Jun-2003  21:40  4.2.3.616    584,296  Wincepb42-030616-kb822253-armv4.exe 16-Jun-2003 21:40  4.2.3.616    584,296  Wincepb42-030616-kb822253-armv4i.exe 16-Jun-2003 21:40  4.2.3.616    588,392  Wincepb42-030616-kb822253-mipsii.exe 16-Jun-2003 21:41  4.2.3.616    588,392  Wincepb42-030616-kb822253-mipsii_fp.exe 16-Jun-2003 21:41  4.2.3.616    592,488  Wincepb42-030616-kb822253-mipsiv.exe 16-Jun-2003 21:41  4.2.3.616    592,488  Wincepb42-030616-kb822253-mipsiv_fp.exe 16-Jun-2003 21:40  4.2.3.616    580,200  Wincepb42-030616-kb822253-sh3.exe 16-Jun-2003 21:40  4.2.3.616    580,200  Wincepb42-030616-kb822253-sh4.exe 16-Jun-2003 21:40  4.2.3.616    576,104  Wincepb42-030616-kb822253-x86.exe The English version of this fix 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.   Date         Time                      Size    File name --  Path: Public\Common\Oak\Lib\Armv4\Debug 04-Jun-2003 04:54                    115,016  Cxport.lib 04-Jun-2003 04:54                     61,440  Cxport.pdb

Path: Public\Common\Oak\Lib\Armv4\Retail 04-Jun-2003 04:43                     53,994  Cxport.lib 04-Jun-2003 04:43                     61,440  Cxport.pdb

Path: Public\Common\Oak\Lib\Armv4i\Debug 04-Jun-2003 05:16                    115,158  Cxport.lib 04-Jun-2003 05:16                     61,440  Cxport.pdb

Path: Public\Common\Oak\Lib\Armv4i\Retail 04-Jun-2003 05:05                     54,190  Cxport.lib 04-Jun-2003 05:05                     61,440  Cxport.pdb

Path: Public\Common\Oak\Lib\Mipsii\Debug 04-Jun-2003 05:39                    128,138  Cxport.lib 04-Jun-2003 05:39                     61,440  Cxport.pdb

Path: Public\Common\Oak\Lib\Mipsii\Retail 04-Jun-2003 05:28                     58,872  Cxport.lib 04-Jun-2003 05:28                     61,440  Cxport.pdb

Path: Public\Common\Oak\Lib\Mipsii_fp\Debug 04-Jun-2003 06:01                    128,150  Cxport.lib 04-Jun-2003 06:01                     61,440  Cxport.pdb

Path: Public\Common\Oak\Lib\Mipsii_fp\Retail 04-Jun-2003 05:50                     58,880  Cxport.lib 04-Jun-2003 05:50                     61,440  Cxport.pdb

Path: Public\Common\Oak\Lib\Mipsiv\Debug 04-Jun-2003 06:23                    129,354  Cxport.lib 04-Jun-2003 06:23                     61,440  Cxport.pdb

Path: Public\Common\Oak\Lib\Mipsiv\Retail 04-Jun-2003 06:12                     59,350  Cxport.lib 04-Jun-2003 06:12                     61,440  Cxport.pdb

Path: Public\Common\Oak\Lib\Mipsiv_fp\Debug 04-Jun-2003 06:45                    129,366  Cxport.lib 04-Jun-2003 06:45                     61,440  Cxport.pdb

Path: Public\Common\Oak\Lib\Mipsiv_fp\Retail 04-Jun-2003 06:34                     59,358  Cxport.lib 04-Jun-2003 06:34                     61,440  Cxport.pdb

Path: Public\Common\Oak\Lib\Sh3\Debug 04-Jun-2003 07:08                    102,092  Cxport.lib 04-Jun-2003 07:08                     61,440  Cxport.pdb

Path: Public\Common\Oak\Lib\Sh3\Retail 04-Jun-2003 06:57                     50,314  Cxport.lib 04-Jun-2003 06:57                     61,440  Cxport.pdb

Path: Public\Common\Oak\Lib\Sh4\Debug 04-Jun-2003 07:30                    102,068  Cxport.lib 04-Jun-2003 07:30                     61,440  Cxport.pdb

Path: Public\Common\Oak\Lib\Sh4\Retail 04-Jun-2003 07:19                     50,116  Cxport.lib 04-Jun-2003 07:19                     61,440  Cxport.pdb

Path: Public\Common\Oak\Lib\X86\Debug 04-Jun-2003 04:32                    102,144  Cxport.lib 04-Jun-2003 04:32                     61,440  Cxport.pdb

Path: Public\Common\Oak\Lib\X86\Retail 04-Jun-2003 04:21                     46,488  Cxport.lib 04-Jun-2003 04:21                     61,440  Cxport.pdb



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



MORE INFORMATION
System images that are built after you apply this update will have a default threshold of 20000 (instead of 100000). As a result, Cxport will keep smaller available memory pools, and more memory will be released after network traffic decreases.

After this update is installed, you can configure the CXPORT allocator by using the registry.

Example Registry Settings
# FreeLimit is the threshold. Default is 20000.


 * 1) FreeLists determines if CXPORT uses memory pools or the private heap directly.


 * 1) Set to 0 to use private heap directly. Set to 1 to use memory pools. Default is 1.

[HKEY_LOCAL_MACHINE\Comm\Cxport]

&quot;FreeLimit&quot;=dword:20000

&quot;FreeLists&quot;=dword:1

Keywords: kbbug kbfix kbqfe KB822253

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