Author: jkim
Date: Tue Dec 7 18:14:38 2010
New Revision: 216261
URL: http://svn.freebsd.org/changeset/base/216261
Log:
MFC: r216159
Do not change CPU ticker frequency if TSC is P-state invariant.
Approved by: re (kib)
Modified:
stable/8/sys/amd64/amd64/tsc.c
stable/8/sys/i386/i386/tsc.c
Directory Properties:
stable/8/sys/ (props changed)
stable/8/sys/amd64/include/xen/ (props changed)
stable/8/sys/cddl/contrib/opensolaris/ (props changed)
stable/8/sys/contrib/dev/acpica/ (props changed)
stable/8/sys/contrib/pf/ (props changed)
Modified: stable/8/sys/amd64/amd64/tsc.c
==============================================================================
--- stable/8/sys/amd64/amd64/tsc.c Tue Dec 7 17:54:04 2010
(r216260)
+++ stable/8/sys/amd64/amd64/tsc.c Tue Dec 7 18:14:38 2010
(r216261)
@@ -146,6 +146,9 @@ tsc_levels_changed(void *arg, int unit)
int count, error;
uint64_t max_freq;
+ if (tsc_is_invariant)
+ return;
+
/* Only use values from the first CPU, assuming all are equal. */
if (unit != 0)
return;
Modified: stable/8/sys/i386/i386/tsc.c
==============================================================================
--- stable/8/sys/i386/i386/tsc.c Tue Dec 7 17:54:04 2010
(r216260)
+++ stable/8/sys/i386/i386/tsc.c Tue Dec 7 18:14:38 2010
(r216261)
@@ -170,6 +170,9 @@ tsc_levels_changed(void *arg, int unit)
int count, error;
uint64_t max_freq;
+ if (tsc_is_invariant)
+ return;
+
/* Only use values from the first CPU, assuming all are equal. */
if (unit != 0)
return;
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