[p4] Request too large from p4 changes

[Thierry Lam]

I'm trying to find out what the last 5 changes were from a specific location on the depot, for instance::

p4 changes -m5 //depot/main/hello/...
Request too large (over 400000); see 'p4 help maxresults'.

I get the above message, however the above works fine with -m1 but anything greater than 1 fails.  The same p4 changes -m5 command works elsewhere on the depot, does anyone know if there's a perforce mechanism which  controls this behaviour?

Thierry