Error: Event 1020, Perflib, Win 10, 1903

  1.    #1

    Error: Event 1020, Perflib, Win 10, 1903

    I have been getting this error every day since I updated to Win10 1903.
    The text of the error is:
    "The required buffer size is greater than the buffer size passed to the Collect function of the "C:\Windows\System32\perfts.dll" Extensible Counter DLL for the "LSM" service. The given buffer size was 8056 and the required size was 33040."

    I have combed the internet and can find no reference to this error. Can anyone help?

      My ComputerSystem Spec

  2. Posts : 3
    WINDOWS 10 PRO 64Bit

    Same here.....
      My ComputerSystem Spec

  3. Lance1's Avatar
    Posts : 43
    Windows 10 Professional x64

    5 Days with no response! Unacceptable.. Have you looked at this? Hope it helps.. Event ID - 1020
      My ComputerSystem Spec

  4. Posts : 3
    WINDOWS 10 PRO 64Bit

    Thanks for the pointer Lance1,

    Ran Lodctr /R from an Administrator CMD prompt but got:

    C:\Windows\system32>Lodctr /R
    Error: Unable to rebuild performance counter setting from system backup store, error code is 2.

    Bit of research later found out I had to run it form:


    Than ran Lodctr /R and got:

    Info: Successfully rebuilt performance counter setting from system backup store.

    Note that Lodctr /R is case sensitive!

    Will report back if it fixes the event message

    Kind regards and thanks again for the pointer!

      My ComputerSystem Spec

  5. RichardC's Avatar
    Posts : 188
    windows10 home v1903 OS build 18362.239

    c:\Windows\SysWOW64>Lodctr /R
    Error: Unable to rebuild performance counter setting from system backup store, error code is 2

    This is what I got.
      My ComputerSystem Spec

  6.    #6

    I ran Lodctr /R successfully. However it generated 2 new errors in the Error Log.

    Event 1017, Perflib.
    Disabled performance counter data collection from the "ASP.NET_2.0.50727" service because the performance counter library for that service has generated one or more errors. The errors that forced this action have been written to the application event log. Correct the errors before enabling the performance counters for this service.

    Event 1021, Perflib.
    Windows cannot open the 32-bit extensible counter DLL "C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\aspnet_perf.dll" in a 64-bit environment (Win32 error code C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\aspnet_perf.dll is not a valid Win32 application.). Contact the file vendor to obtain a 64-bit version. Alternatively, you can open the 32-bit extensible counter DLL by using the 32-bit version of Performance Monitor. To use this tool, open the Windows folder, open the Syswow64 folder, and then start Perfmon.exe.

    I have not attempted to correct these errors - if it is possible. Just wanted to make the errors known.

      My ComputerSystem Spec


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