I have a project that hasn't changed (no checkins to Perforce), building on a slave (that hasn't changed either). Yet the P4 plugin thinks there are changes and kicks off a build several times a day.

The polling log shows:

Started on Nov 10, 2010 9:29:10 AM
Looking for changes...
Using node: builder-ubuntu-jaunty-32-nutmeg
Using remote perforce client: hudson-unitpp-linux32--497286900
[unitpp-Linux-32] $ /usr/local/bin/p4 workspace -o hudson-unitpp-linux32--497286900
Changing P4 Client Root to: /home/boss/hudson/workspace/unitpp-Linux-32
Changing P4 Client View from:

Changing P4 Client View to:
//depot/External/unit++/... //hudson-unitpp-linux32--497286900/...
-//depot/External/unit++/Lib/... //hudson-unitpp-linux32--497286900/Lib/...
-//depot/External/unit++/Include/... //hudson-unitpp-linux32--497286900/Include/...
Done. Took 0.45 sec
Changes found