d/freebsd-nq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Updated the CPU_DISABLE_CMPXCHG notes to warn users not to also enable

Browse Source 
SMP with it.

Requested by:	Lars Eggert <larse@ISI.EDU>
This commit is contained in:
Jim Pirzyk 2002-10-16 15:59:07 +00:00
parent cd9b47f3c2
commit e22f9477f7
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
sys/i386/conf/NOTES
View File

@ -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.