diff options
author | jhb <jhb@FreeBSD.org> | 2004-03-24 17:51:54 +0000 |
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committer | jhb <jhb@FreeBSD.org> | 2004-03-24 17:51:54 +0000 |
commit | 3770c58daa83631263248783fbf046b3d00746b1 (patch) | |
tree | c5cdaad04b6fd16ab476906c8addc3096a7964cb /share | |
parent | 53ff6f54e2971776a46586e7efe79839fdedf3d1 (diff) | |
download | FreeBSD-src-3770c58daa83631263248783fbf046b3d00746b1.zip FreeBSD-src-3770c58daa83631263248783fbf046b3d00746b1.tar.gz |
- Update for the new interrupt code on i386 meaning that SMP kernels can
now run on UP machines, options APIC_IO is now spelled device apic, and
HT CPUs are now enabled by default.
- Add a 'I386 NOTES' section header to the i386-specific paragraphs.
Someone with more mdoc fu can suggest a better name if needed.
Requested by: kris (1)
Diffstat (limited to 'share')
-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 , |