Messages in this thread | | | Date | Mon, 18 Oct 1999 16:49:59 -0400 (EDT) | From | <> | Subject | Re: Large Memory Systems Info |
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On Mon, 18 Oct 1999, Brian D. Haymore wrote:
> 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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