Microsoft KB Archive/327540

= Copying a Large File Causes Your Handheld Device to Slow Down =

Article ID: 327540

Article Last Modified on 5/27/2005

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APPLIES TO


 * Microsoft Windows CE .NET 4.1

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This article was previously published under Q327540



SYMPTOMS
After you work with a lot of data in the Windows CE file system (for example, when you copy a large file to the RAM file system), your device may seem to run slowly.



CAUSE
The RAM file system constantly checks for fragmentation of the storage structure that is used to store files, databases, and the registry. The compaction process is CPU-intensive; the process can take a lot of time if there is a lot of fragmentation.



RESOLUTION
A supported software update is now available from Microsoft as Windows CE 4.0 Core OS QFE Q327540. 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

The English version of this package has the following file attributes or later:   Size     File name ---  346,720  020906_armv4i_wce41-q327540.exe 346,720 020906_armv4t_wce41-q327540.exe 346,720 020906_armv4_wce41-q327540.exe 334,432 020906_mips16_wce41-q327540.exe 350,816 020906_mipsii_fp_wce41-q327540.exe 350,816 020906_mipsii_wce41-q327540.exe 350,816 020906_mipsiv_fp_wce41-q327540.exe 350,816 020906_mipsiv_wce41-q327540.exe 338,528 020906_sh3_wce41-q327540.exe 338,528 020906_sh4_wce41-q327540.exe 322,144 020906_x86_wce41-q327540.exe The English version of this fix has the file attributes (or later) that are listed in the following table.   Date         Time   Size     File name   Platform -  08-Aug-2002  13:48  182,166  Fsmain.lib  armv4\debug 08-Aug-2002 13:48   69,632  Fsmain.pdb  armv4\debug 08-Aug-2002 13:48  154,430  Fsmain.lib  armv4\retail 08-Aug-2002 13:48   69,632  Fsmain.pdb  armv4\retail 08-Aug-2002 13:46  182,438  Fsmain.lib  armv4i\debug 08-Aug-2002 13:46   69,632  Fsmain.pdb  armv4i\debug 08-Aug-2002 13:46  154,644  Fsmain.lib  armv4i\retail 08-Aug-2002 13:46   69,632  Fsmain.pdb  armv4i\retail 08-Aug-2002 13:45  174,214  Fsmain.lib  armv4t\debug 08-Aug-2002 13:45   69,632  Fsmain.pdb  armv4t\debug 08-Aug-2002 13:44  149,414  Fsmain.lib  armv4t\retail 08-Aug-2002 13:44   69,632  Fsmain.pdb  armv4t\retail 08-Aug-2002 13:52  162,418  Fsmain.lib  mips16\debug 08-Aug-2002 13:52   69,632  Fsmain.pdb  mips16\debug 08-Aug-2002 13:51  111,986  Fsmain.lib  mips16\retail 08-Aug-2002 13:51   69,632  Fsmain.pdb  mips16\retail 08-Aug-2002 13:50  197,766  Fsmain.lib  mipsii\debug 08-Aug-2002 13:50   69,632  Fsmain.pdb  mipsii\debug 08-Aug-2002 13:49  148,812  Fsmain.lib  mipsii\retail 08-Aug-2002 13:49   69,632  Fsmain.pdb  mipsii\retail 08-Aug-2002 13:53  197,774  Fsmain.lib  mipsii_fp\debug 08-Aug-2002 13:53   69,632  Fsmain.pdb  mipsii_fp\debug 08-Aug-2002 13:53  148,820  Fsmain.lib  mipsii_fp\retail 08-Aug-2002 13:53   69,632  Fsmain.pdb  mipsii_fp\retail 08-Aug-2002 02:00  200,176  Fsmain.lib  mipsiv\debug 08-Aug-2002 02:00   69,632  Fsmain.pdb  mipsiv\debug 08-Aug-2002 13:59  149,874  Fsmain.lib  mipsiv\retail 08-Aug-2002 13:59   69,632  Fsmain.pdb  mipsiv\retail 08-Aug-2002 13:56  200,184  Fsmain.lib  mipsiv_fp\debug 08-Aug-2002 13:56   69,632  Fsmain.pdb  mipsiv_fp\debug 08-Aug-2002 13:56  149,882  Fsmain.lib  mipsiv_fp\retail 08-Aug-2002 13:56   69,632  Fsmain.pdb  mipsiv_fp\retail 08-Aug-2002 13:55  163,080  Fsmain.lib  sh3\debug 08-Aug-2002 13:55   69,632  Fsmain.pdb  sh3\debug 08-Aug-2002 13:54  125,206  Fsmain.lib  sh3\retail 08-Aug-2002 13:54   69,632  Fsmain.pdb  sh3\retail 08-Aug-2002 13:58  163,056  Fsmain.lib  sh4\debug 08-Aug-2002 13:58   69,632  Fsmain.pdb  sh4\debug 08-Aug-2002 13:58  125,168  Fsmain.lib  sh4\retail 08-Aug-2002 13:58   69,632  Fsmain.pdb  sh4\retail 08-Aug-2002 13:43  148,328  Fsmain.lib  x86\debug 08-Aug-2002 13:43   69,632  Fsmain.pdb  x86\debug 08-Aug-2002 13:43  103,632  Fsmain.lib  x86\retail 08-Aug-2002 13:43   69,632  Fsmain.pdb  x86\retail



MORE INFORMATION
With this hotfix you can adjust the priority of the compaction thread so that you can tune the CPU time. These changes to the Windows CE file-system-compaction have no effect unless you add the following registry key to the platform:

HKEY_LOCAL_MACHINE\System\ObjectStore

CompactionPrio256=DWORD:251

The default setting is 251. This is equivalent to typical thread priority. To set the compaction thread to run at idle, set the priority to 255. It is a good idea to set this value between 251 and 255.

If you change the setting, you must reset the device to make the change take effect.



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

Keywords: kbbug kbfix kbqfe kbenv KB327540

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