diff options
| author | pirzyk <pirzyk@FreeBSD.org> | 2002-10-16 15:59:07 +0000 |
|---|---|---|
| committer | pirzyk <pirzyk@FreeBSD.org> | 2002-10-16 15:59:07 +0000 |
| commit | b5f1c32484809b16201c6f811dfec57d6e9e7ba7 (patch) | |
| tree | 15f1053da6a29498e5ab6bbd6265b14698e5955f /sys/i386/conf | |
| parent | a497fb34ea0502c7d33d9f560b6784951f33fe56 (diff) | |
| download | FreeBSD-src-b5f1c32484809b16201c6f811dfec57d6e9e7ba7.zip FreeBSD-src-b5f1c32484809b16201c6f811dfec57d6e9e7ba7.tar.gz | |
Updated the CPU_DISABLE_CMPXCHG notes to warn users not to also enable
SMP with it.
Requested by: Lars Eggert <larse@ISI.EDU>
Diffstat (limited to 'sys/i386/conf')
| -rw-r--r-- | sys/i386/conf/NOTES | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/sys/i386/conf/NOTES b/sys/i386/conf/NOTES index 967c6ab..467ee68 100644 --- a/sys/i386/conf/NOTES +++ b/sys/i386/conf/NOTES @@ -144,7 +144,8 @@ cpu I686_CPU # aka Pentium Pro(tm) # # CPU_DISABLE_CMPXCHG disables the CMPXCHG instruction on > i386 IA32 # machines. VmWare seems to emulate this instruction poorly, causing -# the guest OS to run very slowly. +# the guest OS to run very slowly. Enabling this with a SMP kernel +# will cause the kernel to be unusable. # # NOTE 1: The options, CPU_BTB_EN, CPU_LOOP_EN, CPU_IORT, # CPU_LOOP_EN and CPU_RSTK_EN should not be used because of CPU bugs. |
