diff options
Diffstat (limited to 'sys/i386/conf/NOTES')
| -rw-r--r-- | sys/i386/conf/NOTES | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/sys/i386/conf/NOTES b/sys/i386/conf/NOTES index 7730730..161903e 100644 --- a/sys/i386/conf/NOTES +++ b/sys/i386/conf/NOTES @@ -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 |
