Andrew Svetlov <andrew.svet...@gmail.com> added the comment:

The value type is DWORD.

0xffffffff is a maximum allowed value for DWORD.

0 implies something like 8 for Intel i7.

I don't remember the reason (the value was present is very first proactor 
implementation and never changed after it).

Maybe giving Windows a privilegy to decide what number of IO threads is optimal 
is not a bad idea, I don't know.

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