In general, you cannot redefine maximum results; it was installed this way for some reason by your administrator. Here's the documentation: http://www.perforce.com/perforce/doc.current/manuals/p4sag/chapter.performance.html#d0e20714
Do you really need to sync more than 3 million files? If so, you may need to ask your administrator to add you to a user group with a higher resource limit.
Alternatively, you can reduce the amount of workspace by specifying a more accurate view of the view in the definition of the workspace. Instead
//depot/... //my-client/...
set the display of the workspace view to something more:
//depot/main/my-project/... //my-client/main/my-project/...
Thus, you only synchronize the part of the repository that is really necessary for your project.
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