On Sat, Aug 17, 2013 at 07:49:08PM +0000, Neel Natu wrote: > Author: neel > Date: Sat Aug 17 19:49:08 2013 > New Revision: 254466 > URL: http://svnweb.freebsd.org/changeset/base/254466 > > Log: > Bump up the maximum addressable memory on amd64 systems from 1TB to 4TB. > Bump up the KVA size proportionally from 512GB to 2TB. > > The number of page table pages used by the direct map is now calculated at > run time based on 'Maxmem'. This means the small memory systems will not > see any additional tax in terms of page table pages for the direct map. > > However all amd64 systems, regardless of the memory size, will use 3 more > pages to accomodate the bump in the KVA size. > > More details available here: > http://lists.freebsd.org/pipermail/freebsd-hackers/2013-June/043015.html > http://lists.freebsd.org/pipermail/freebsd-current/2013-July/043143.html > > Tested with the following configurations: > - Sandybridge server with 64GB of memory. > - bhyve VM with 64MB of memory. > - bhyve VM with a 8GB of memory with the memory segment above 4GB cuddling > right up against the 4TB maximum memory limit. > > Discussed on: hackers@, current@ > Submitted by: Chris Torek (to...@torek.net) > > Modified: > head/sys/amd64/amd64/pmap.c > head/sys/amd64/include/pmap.h > head/sys/amd64/include/vmparam.h
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