3/21/07, Vivek <vivekutal@xxxxxxxxx> wrote:
> Why is kernel restricted to use virtual addresses of only 1 GB? Or > what is the need to split up the virtual address space into user > addresses and kernel addresses? We can have 4GB for kernel and 4GB for userspace but this has a overhead of flushing of tlb for every syscall. You can also make the split 2/2GB but this has a problem of having less user address space. 3/1 is a better choice.
Does TLB size change 4, 3, or 2 GB virtual addresses are used? I though it would be same irrespective of whether virtual addresses are 4 or 1 GB. If the TLB size is at all same for any number of virtual addresses then what difference it make while flushing the TLB?
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