About kernel memory limit

[Haojian Zhuang]

On Fri, Nov 11, 2011 at 12:44 PM, Geraint Yang <geraint0923 at gmail.com> wrote:
> Hi Dave,
> Thank you for your help !
> Does it mean that I could use all of the memory my computer has? But one of
> my classmates told me that kernel could only use 1G from a 4G
> memory.computer...Is there anything I have misunderstood ?
>

Kernel can operate 896MB directly. If your physical memory is larger
than this memory size, you can use high memory. So kernel needs to map
them first, then use it. The mapped size is limited in 128MB at the
same time.

Thanks
Haojian