After read the uncore Uncore Programming Guide we want to monitor common event in iMC -- PCT_REQUESTS_PAGE_EMPTY,and its equation is (ACT_COUNT - PRE_COUNT.PAGE_MISS)/ (CAS_COUNT.RD + CAS_COUNT.WR).
But when we get the data of ACT_COUNT and PRE_COUNT.PAGE_MISS,we found that the count of PRE_COUNT.PAGE_MISS is bigger than the data of ACT_COUNT which seems PCT_REQUESTS_PAGE_EMPTY unreasonable. How can it be. Will ACT_COUNT little than PRE_COUNT.PAGE_MISS?
I have read the Uncore Programming Guide,but can`t clearly understand the meaning of ACT_COUNT and PRE_COUNT.PAGE_MISS. can anyone explain that for me thank you all.