Query regarding kernel memory

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Hi,
 
I read a few articles on linux virtual memory management such as this one :
http://lwn.net/Articles/75174/
 
which say that earlier linux kernel could only use memory slightly below 1 GB. They have
given the reason for it but I am unable to understand.They further describe the use of High memory and low memory.
Could anybody please explain the reason for kernel not being able to use the 1 GB completely?
Also please provide references for high memory and low memory.
 
 
Thanks
Vaibhav Jain
 
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