Limits on Overlapped Pipe Operations

SUMMARY

The Windows NT version 3.1 redirector allows only 17 outstanding overlapped pipe operations at any given time. The Windows NT 3.5 redirector does not have this restriction on overlapped pipe writes. However, the Windows NT 3.5 redirector allows only 17 outstanding overlapped pipe reads at any given time.

If the client uses overlapped I/O through the redirector, it is possible for the client to become deadlocked. You may need to increase the number of threads that the redirector uses for I/O; the same thing is true for the server. If your application is doing a lot of I/O, you can avoid this deadlock by creating extra threads and having them use non-overlapped I/O.

   HKEY_LOCAL_MACHINE\SYSTEM\ 
      CurrentControlSet\ 
      Services\ 
      LanmanWorkstation\ 
      Parameters\ 
      MaxThreads