diff options
| -rw-r--r-- | share/man/man4/smp.4 | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/share/man/man4/smp.4 b/share/man/man4/smp.4 index 7877fd3..c15ccdb 100644 --- a/share/man/man4/smp.4 +++ b/share/man/man4/smp.4 @@ -42,10 +42,9 @@ architectures on Currently, this includes alpha, i386, ia64, and sparc64. Support is enabled using .Cd options SMP . -On most platforms it is permissible to use the SMP -kernel configuration on non-SMP equipped motherboards. -The only exception to this rule is the i386 platform. -.Pp +It is permissible to use the SMP kernel configuration on non-SMP equipped +motherboards. +.Sh I386 NOTES For i386 systems, the .Nm kernel supports motherboards that follow the Intel MP specification, @@ -53,19 +52,17 @@ version 1.4. In addition to .Cd options SMP , i386 also requires -.Cd options APIC_IO . +.Cd device apic . The .Xr mptable 1 command may be used to view the status of multi-processor support. .Pp .Fx supports hyperthreading on Intel CPU's on the i386 platform. -By default, logical CPUs are not used to execute user processes due to -performance penalties under common loads. -To allow the logical CPUs to execute user processes, -turn off the +Since using logical CPUs can cause performance penalties under certain loads, +the logical CPUs can be disabled by setting the .Va machdep.hlt_logical_cpus -sysctl by setting its value to zero. +sysctl to one. .Sh SEE ALSO .Xr mptable 1 , .Xr condvar 9 , |
