> Could someone point me to a FAQ or other info that explains more about
> Linux's current ability to use large (i.e. 1GB+) amounts of memory.
> Specifically why you don't get all 1GB of your 1GB system, you only get
> 900 some odd megabytes. Also when support for more then 2GB is
> expected. Thanks.
In 2.2, the reason for large memory support on x86 giving slightly less
than the 1 or 2 GB selected is that the kernel requires a portion of the
virtual address space for things like vmalloc and ioremap. Recent
versions of 2.3 have removed this restriction with the addition of
CONFIG_BIGMEM, which can map memory beyond what the kernel can address
into process' requests for anonymous pages.
-ben
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