3/21/07, Vivek <[EMAIL PROTECTED]> 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?
--
Vivek Kutal
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