Perfmon on Win2008 vs Win2003

looking explanation on - we're undergoing load testing our application (vs2008 c++ 32-bit, unmanaged) , seeing considerable difference in private bytes reading between win2003 , win2008 i.e. 25% more in win2008 (r1 sp2).  we're running 2 environments on identical hardware. also, if there memory leak (still investigating on but so far we've come empty with purify and umdh) when running on win2008 since private bytes graph seems going up, level off, again, level off, and not seem stabilize. the perfmon on win2003 (same binary) not see behaviour. erfmon graph on win2003 shows oscillation i.e. goes , down while in win2008 graph goes up, levels off, again, levels off etc.   

are there changes in perfmon between win2008 or need adjust same setting of win2003?  or os memory management behaviour in win2008 ? example understand on servers supports power management,  the power management setting in windows2008 influences perfmon cpu reading.

hopefully can give same insight on memory readings.

p.s. - we've ruled out uac since problem there regardless whether uac is on or off.

hi

for assistance regarding performance monitor, suggest post windows perfmon , diagnostic tools forum:

windows perfmon , diagnostic tools
http://social.msdn.microsoft.com/forums/en-us/perfmon/threads

thanks.

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