On 9/24/06, adheer chandravanshi <adheerchandravanshi@xxxxxxxxx> wrote:
Also I want to know that how does Linux operates using 4mb pages? - We have an advantage of using 4mb pages i.e it increases the TLB coverage area thus TLB misses are reduced.
In the Processors, TLB for 4 MB pages is separate from the TLB of normal 4K pages. So this also removes interference with the 4K page TLBs.
-Also page table hierarchy is reduced causing less memory overhead. Are there any other advantages of using 4mb pages? What are the disadvantages of using 4mb pages? -Adheer
Bhanu.
On 9/24/06, adheer chandravanshi <adheerchandravanshi@xxxxxxxxx> wrote: > > Thanks a lot for your replies! > > but i actually want to know the applications that can use the page size of 4MB. > And what will be the difference if 4MB page size is used on 32bit machine and 64bit machine? > > -Adheer > > > On 9/24/06, Nish Aravamudan <nish.aravamudan@xxxxxxxxx > wrote: > > On 9/23/06, Rik van Riel < riel@xxxxxxxxxxx> wrote: > > > borasahin@xxxxxxxxxxx wrote: > > > >> On x86 architecture generally 4kb and 4mb page size is supported..2mb with > > > >> PAE enabled.. > > > >> > > > >> I want to know that in which scenarios the pages with size 4mb and 2mb are > > > >> used? > > > > > > > > e.g. for kernel code and data. > > > > > > Also for hugetlbfs, which is used for shared memory segments > > > by some databases. Possibly other software too. > > > > There is also libhugetlbfs, which makes it possible to remap a > > programs text/data/BSS segments into huge pages, and to back malloc by > > huge pages. > > > > http://sourceforge.net/projects/libhugetlbfs > > > > Thanks, > > Nish > > > >
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