2 votes 2 votes In $T_{Read Avg}$, shouldn’t it be $T_{Read Avg}$ = (10*0.9) + 0.1*(10+100), because it must be checking the cache in case of cache miss too, right? CO and Architecture co-and-architecture cache-memory multilevel-cache + – h4kr asked Dec 27, 2022 h4kr 594 views answer comment Share Follow See all 5 Comments See all 5 5 Comments reply Show 2 previous comments Kabir5454 commented Dec 27, 2022 reply Follow Share In hierarchical access, you have to first put the data to cache for which extra 0.1*(100+10) here 10 unit time extra needed . But in simultaneous we directly read from main memory so we don't need to take the data from main memory to cache but simultaneously search in both cache in main memory. So no need of extra 10 unit time in 0.1*(100+10) . 2 votes 2 votes gatecse commented Dec 27, 2022 reply Follow Share Yes, by default it is heirarchical for cache as used in standard text books. 2 votes 2 votes h4kr commented Dec 27, 2022 reply Follow Share thanks 1 votes 1 votes Please log in or register to add a comment.