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Add a new VM options section. Move KSTACK_PAGES there from the MI NOTES

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file and better document it.  Add better documentation for the DISABLE_PSE
option.  Add the missing DISABLE_PG_G option and document it.
This commit is contained in:
John Baldwin 2002-07-15 19:25:40 +00:00
parent 5e4fa8916d
commit 30cce2ed6b
1 changed files with 25 additions and 3 deletions
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28
sys/i386/conf/NOTES
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@ -918,6 +918,31 @@ options COMPAT_SVR4 # build emulator statically
options DEBUG_SVR4 # enable verbose debugging
device streams # STREAMS network driver (required for svr4).
#####################################################################
# VM OPTIONS
# Disable the 4 MByte page PSE CPU feature. The PSE feature allows the
# kernel to use a 4 MByte pages to map the kernel instead of 4k pages.
# This saves on the amount of memory needed for page tables needed to
# map the kernel. You should only disable this feature as a temporary
# workaround if you are having problems with it enabled.
#
#options DISABLE_PSE
# Disable the global pages PGE CPU feature. The PGE feature allows pages
# to be marked with the PG_G bit. TLB entries for these pages are not
# flushed from the cache when %cr3 is reloaded. This can make context
# switches less expensive. You should only disable this feature as a
# temporary workaround if you are having problems with it enabled.
#
#options DISABLE_PG_G
# KSTACK_PAGES is the number of memory pages to assign to the kernel
# stack of each thread.
options KSTACK_PAGES=3
#####################################################################
# More undocumented options for linting.
@ -927,9 +952,6 @@ device streams # STREAMS network driver (required for svr4).
options PECOFF_SUPPORT
options PECOFF_DEBUG
# Disable the 4 MByte PSE CPU feature.
#options DISABLE_PSE
options ENABLE_ALART
options I4B_SMP_WORKAROUND
options I586_PMC_GUPROF=0x70000