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| author | jmg <jmg@FreeBSD.org> | 2006-09-13 01:23:08 +0000 |
|---|---|---|
| committer | jmg <jmg@FreeBSD.org> | 2006-09-13 01:23:08 +0000 |
| commit | 8b66317cb4ac9de9b7e7f9e37d1b39a1e4495e78 (patch) | |
| tree | 614dac7bfac3f91f9d00a5feefac763a720eb5f9 /sys/i386 | |
| parent | 6e6b04c407478ae9c68a0ab4fd898403d7c35c94 (diff) | |
| download | FreeBSD-src-8b66317cb4ac9de9b7e7f9e37d1b39a1e4495e78.zip FreeBSD-src-8b66317cb4ac9de9b7e7f9e37d1b39a1e4495e78.tar.gz | |
document that PAE kernels needs twice the value of non-PAE kernels
for KVA_PAGES, and that it it likely needed for >4GB memory boxes..
MFC after: 3 days
Diffstat (limited to 'sys/i386')
| -rw-r--r-- | sys/i386/conf/NOTES | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/sys/i386/conf/NOTES b/sys/i386/conf/NOTES index e17f747..1a28d4a 100644 --- a/sys/i386/conf/NOTES +++ b/sys/i386/conf/NOTES @@ -1045,7 +1045,11 @@ options PMAP_SHPGPERPROC=201 # constraints in loader(8) on i386, this must be a multiple of 4. # 256 = 1 GB of kernel address space. Increasing this also causes # a reduction of the address space in user processes. 512 splits -# the 4GB cpu address space in half (2GB user, 2GB kernel). +# the 4GB cpu address space in half (2GB user, 2GB kernel). For PAE +# kernels, the value will need to be double non-PAE. A value of 1024 +# for PAE kernels is necessary to split the address space in half. +# This will likely need to be increased to handle memory sizes >4GB. +# PAE kernels default to a value of 512. # options KVA_PAGES=260 |
