[src/trunk]: src/sys/arch/x86/x86 when warning about TSC going backwards, pro...

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

details:   https://anonhg.NetBSD.org/src/rev/be5a18e97796
branches:  trunk
changeset: 983692:be5a18e97796
user:      nia <nia%NetBSD.org@localhost>
date:      Wed Jun 02 06:48:10 2021 +0000

description:
when warning about TSC going backwards, provide advice to the sysadmin.

diffstat:

 sys/arch/x86/x86/tsc.c |  7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diffs (28 lines):

diff -r 5b9769f89ca1 -r be5a18e97796 sys/arch/x86/x86/tsc.c
--- a/sys/arch/x86/x86/tsc.c    Wed Jun 02 01:48:08 2021 +0000
+++ b/sys/arch/x86/x86/tsc.c    Wed Jun 02 06:48:10 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: tsc.c,v 1.55 2021/06/01 21:29:24 riastradh Exp $       */
+/*     $NetBSD: tsc.c,v 1.56 2021/06/02 06:48:10 nia Exp $     */
 
 /*-
  * Copyright (c) 2008, 2020 The NetBSD Foundation, Inc.
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: tsc.c,v 1.55 2021/06/01 21:29:24 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: tsc.c,v 1.56 2021/06/02 06:48:10 nia Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -427,7 +427,8 @@
                        ticks = getticks();
                        if (ticks - lastwarn >= hz) {
                                printf(
-                                   "WARNING: TSC time went backwards by %u\n",
+                                   "WARNING: TSC time went backwards by %u - "
+                                   "change sysctl(7) kern.timecounter?\n",
                                    (unsigned)(prev - cur));
                                lastwarn = ticks;
                        }