[src/trunk]: src/usr.sbin/psrset Add a recommendation for SMT to not split th...

[ad <ad%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/6779a3eaa9f2
branches:  trunk
changeset: 467013:6779a3eaa9f2
user:      ad <ad%NetBSD.org@localhost>
date:      Thu Jan 09 15:50:16 2020 +0000

description:
Add a recommendation for SMT to not split threads.  XXX This should report
topo info to help the decision.

diffstat:

 usr.sbin/psrset/psrset.8 |  10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diffs (32 lines):

diff -r 252305c41538 -r 6779a3eaa9f2 usr.sbin/psrset/psrset.8
--- a/usr.sbin/psrset/psrset.8  Thu Jan 09 13:22:30 2020 +0000
+++ b/usr.sbin/psrset/psrset.8  Thu Jan 09 15:50:16 2020 +0000
@@ -1,6 +1,6 @@
-.\"    $NetBSD: psrset.8,v 1.5 2008/09/23 10:09:56 rmind Exp $
+.\"    $NetBSD: psrset.8,v 1.6 2020/01/09 15:50:16 ad Exp $
 .\"
-.\" Copyright (c) 2008 The NetBSD Foundation, Inc.
+.\" Copyright (c) 2008, 2020 The NetBSD Foundation, Inc.
 .\" All rights reserved.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
@@ -24,7 +24,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd September 23, 2008
+.Dd January 9, 2020
 .Dt PSRSET 8
 .Os
 .Sh NAME
@@ -61,6 +61,10 @@
 The default set must contain at least one online processor (CPU) at
 all times.
 .Pp
+Where the system has symmetric multithreading (SMT), is is recommended that
+CPUs representing different threads within a single core are not assigned to
+different processor sets.
+.Pp
 Available options:
 .Bl -tag -width indent
 .It Fl a