FIX: The DHCP client causes high CPU utilization in Windows CE .NET 4.2

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SYMPTOMS

High CPU utilization occurs. The user interface responds slowly. Threads that are lower than the regular priority level do not have a chance to run. The problems occur in Microsoft Windows CE .NET 4.2.

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CAUSE

The Dynamic Host Configuration Protocol (DHCP) client is trying to contact the DHCP server. However, the network card is in a disconnected state.

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RESOLUTION

Software update information

A supported software update is now available from Microsoft as Windows CE 4.20 Core OS QFE 891960. 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 (http://support.microsoft.com/kb/837392/ ) How to locate core operating system fixes for Microsoft Windows CE Platform Builder products

Prerequisites

This update is supported only if all previously issued updates for this product have also been installed.

Restart requirement

After you install this update, you must perform a clean build of the whole platform. To clean the platform, click Clean on the Build menu. To build the platform, click Build Platform on the Build menu. You do not have to restart your computer after you apply this update.

Update replacement information

This update does not replace any other updates.

File information

The English version of this package has the file attributes (or later file attributes) that are listed in the following table.

   Date         Time      Size    File name
   --------------------------------------------------------------

   04-Feb-2005  21:23  7,582,720  Wincepb42-050204-kb891960-armv4.msi
   04-Feb-2005  21:24  7,582,720  Wincepb42-050204-kb891960-armv4i.msi
   04-Feb-2005  21:24  7,590,400  Wincepb42-050204-kb891960-mipsii.msi
   04-Feb-2005  21:24  7,590,400  Wincepb42-050204-kb891960-mipsii_fp.msi
   04-Feb-2005  21:24  7,592,960  Wincepb42-050204-kb891960-mipsiv.msi
   04-Feb-2005  21:24  7,592,960  Wincepb42-050204-kb891960-mipsiv_fp.msi
   04-Feb-2005  21:23  7,578,624  Wincepb42-050204-kb891960-sh3.msi
   04-Feb-2005  21:23  7,577,600  Wincepb42-050204-kb891960-sh4.msi
   04-Feb-2005  21:23  7,561,216  Wincepb42-050204-kb891960-x86.msi

The English version of this hotfix has the file attributes (or later file attributes) 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
   27-Jan-2005  17:43  316,434  Dhcp.lib
   27-Jan-2005  17:43  102,400  Dhcp.pdb

   Path: Public\Common\Oak\Lib\Armv4\Retail
   27-Jan-2005  17:43  179,094  Dhcp.lib
   27-Jan-2005  17:43  102,400  Dhcp.pdb

   Path: Public\Common\Oak\Lib\Armv4i\Debug
   27-Jan-2005  17:44  316,752  Dhcp.lib
   27-Jan-2005  17:44  102,400  Dhcp.pdb

   Path: Public\Common\Oak\Lib\Armv4i\Retail
   27-Jan-2005  17:43  179,410  Dhcp.lib
   27-Jan-2005  17:43  102,400  Dhcp.pdb

   Path: Public\Common\Oak\Lib\Mipsii\Debug
   27-Jan-2005  17:44  324,610  Dhcp.lib
   27-Jan-2005  17:44  102,400  Dhcp.pdb

   Path: Public\Common\Oak\Lib\Mipsii\Retail
   27-Jan-2005  17:44  184,344  Dhcp.lib
   27-Jan-2005  17:44  102,400  Dhcp.pdb

   Path: Public\Common\Oak\Lib\Mipsii_fp\Debug
   27-Jan-2005  17:44  324,636  Dhcp.lib
   27-Jan-2005  17:44  102,400  Dhcp.pdb

   Path: Public\Common\Oak\Lib\Mipsii_fp\Retail
   27-Jan-2005  17:44  184,384  Dhcp.lib
   27-Jan-2005  17:44  102,400  Dhcp.pdb

   Path: Public\Common\Oak\Lib\Mipsiv\Debug
   27-Jan-2005  17:44  327,914  Dhcp.lib
   27-Jan-2005  17:44  102,400  Dhcp.pdb

   Path: Public\Common\Oak\Lib\Mipsiv\Retail
   27-Jan-2005  17:44  186,598  Dhcp.lib
   27-Jan-2005  17:44  102,400  Dhcp.pdb

   Path: Public\Common\Oak\Lib\Mipsiv_fp\Debug
   27-Jan-2005  17:44  327,940  Dhcp.lib
   27-Jan-2005  17:44  102,400  Dhcp.pdb

   Path: Public\Common\Oak\Lib\Mipsiv_fp\Retail
   27-Jan-2005  17:44  186,638  Dhcp.lib
   27-Jan-2005  17:44  102,400  Dhcp.pdb

   Path: Public\Common\Oak\Lib\Sh3\Debug
   27-Jan-2005  17:44  289,138  Dhcp.lib
   27-Jan-2005  17:44  102,400  Dhcp.pdb

   Path: Public\Common\Oak\Lib\Sh3\Retail
   27-Jan-2005  17:44  169,040  Dhcp.lib
   27-Jan-2005  17:44  102,400  Dhcp.pdb

   Path: Public\Common\Oak\Lib\Sh4\Debug
   27-Jan-2005  17:44  289,042  Dhcp.lib
   27-Jan-2005  17:44  102,400  Dhcp.pdb

   Path: Public\Common\Oak\Lib\Sh4\Retail
   27-Jan-2005  17:44  168,756  Dhcp.lib
   27-Jan-2005  17:44  102,400  Dhcp.pdb

   Path: Public\Common\Oak\Lib\X86\Debug
   27-Jan-2005  17:43  287,200  Dhcp.lib
   27-Jan-2005  17:43  102,400  Dhcp.pdb

   Path: Public\Common\Oak\Lib\X86\Retail
   27-Jan-2005  17:43  157,348  Dhcp.lib
   27-Jan-2005  17:43  102,400  Dhcp.pdb

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STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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MORE INFORMATION

When the registry setting for the DhcpMaxRetry setting is set to a high number, you experience high CPU utilization. When you use the default registry setting for the DhcpMaxRetry setting, you receive a message that the DHCP server is unavailable.

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