| smp.4 (225775) | smp.4 (233648) |
|---|---|
| 1.\" Copyright (c) 1997 2.\" Steve Passe <fsmp@FreeBSD.org>. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 7 unchanged lines hidden (view full) --- 16.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 17.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 18.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 19.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 20.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 21.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 22.\" SUCH DAMAGE. 23.\" | 1.\" Copyright (c) 1997 2.\" Steve Passe <fsmp@FreeBSD.org>. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 7 unchanged lines hidden (view full) --- 16.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 17.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 18.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 19.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 20.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 21.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 22.\" SUCH DAMAGE. 23.\" |
| 24.\" $FreeBSD: head/share/man/man4/smp.4 225775 2011-09-27 07:00:24Z gabor $ | 24.\" $FreeBSD: head/share/man/man4/smp.4 233648 2012-03-29 05:02:12Z eadler $ |
| 25.\" 26.Dd May 7, 2008 27.Dt SMP 4 28.Os 29.Sh NAME 30.Nm SMP 31.Nd description of the FreeBSD Symmetric Multi-Processor kernel 32.Sh SYNOPSIS --- 85 unchanged lines hidden (view full) --- 118This information is used internally by the kernel to schedule related 119tasks on CPUs that are closely grouped together. 120.Pp 121.Fx 122supports hyperthreading on Intel CPU's on the i386 and AMD64 platforms. 123Because using logical CPUs can cause performance penalties under certain loads, 124the logical CPUs can be disabled by setting the 125.Va machdep.hyperthreading_allowed | 25.\" 26.Dd May 7, 2008 27.Dt SMP 4 28.Os 29.Sh NAME 30.Nm SMP 31.Nd description of the FreeBSD Symmetric Multi-Processor kernel 32.Sh SYNOPSIS --- 85 unchanged lines hidden (view full) --- 118This information is used internally by the kernel to schedule related 119tasks on CPUs that are closely grouped together. 120.Pp 121.Fx 122supports hyperthreading on Intel CPU's on the i386 and AMD64 platforms. 123Because using logical CPUs can cause performance penalties under certain loads, 124the logical CPUs can be disabled by setting the 125.Va machdep.hyperthreading_allowed |
| 126tunable to zero. | 126tunable to zero. |
| 127.Sh SEE ALSO 128.Xr cpuset 1 , 129.Xr mptable 1 , 130.Xr sched_4bsd 4 , 131.Xr sched_ule 4 , 132.Xr loader 8 , 133.Xr sysctl 8 , 134.Xr condvar 9 , --- 29 unchanged lines hidden --- | 127.Sh SEE ALSO 128.Xr cpuset 1 , 129.Xr mptable 1 , 130.Xr sched_4bsd 4 , 131.Xr sched_ule 4 , 132.Xr loader 8 , 133.Xr sysctl 8 , 134.Xr condvar 9 , --- 29 unchanged lines hidden --- |