Core2Duo, notebook и 4GB RAM

В ядре читаем справку по High Memory Support И вникаем почему так произошло

If you are compiling a kernel which will never run on a machine with 
more than 1 Gigabyte total physical RAM, answer "off" here (default 
choice and suitable for most users). This will result in a "3GB/1GB" 
split: 3GB are mapped so that each process sees a 3GB virtual memory 
space and the remaining part of the 4GB virtual memory space is used 
by the kernel to permanently map as much physical memory as possible.

If the machine has between 1 and 4 Gigabytes physical RAM, then answer "4GB" here.

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From Siberia with Love!