Author: jkim
Date: Fri Dec 3 21:06:30 2010
New Revision: 216159
URL: http://svn.freebsd.org/changeset/base/216159
Log:
Do not change CPU ticker frequency if TSC is P-state invariant. Note this
change was meant to be committed with r184102 (and its subsequent MFCs) but
it fell off somehow.
Pointyhat to: jkim
MFC after: 3 days
Modified:
head/sys/amd64/amd64/tsc.c
head/sys/i386/i386/tsc.c
Modified: head/sys/amd64/amd64/tsc.c
==============================================================================
--- head/sys/amd64/amd64/tsc.c Fri Dec 3 20:39:06 2010 (r216158)
+++ head/sys/amd64/amd64/tsc.c Fri Dec 3 21:06:30 2010 (r216159)
@@ -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: head/sys/i386/i386/tsc.c
==============================================================================
--- head/sys/i386/i386/tsc.c Fri Dec 3 20:39:06 2010 (r216158)
+++ head/sys/i386/i386/tsc.c Fri Dec 3 21:06:30 2010 (r216159)
@@ -174,6 +174,9 @@ 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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