1 files changed, 15 insertions, 9 deletions
diff --git a/indra/llcommon/llfasttimer.h b/indra/llcommon/llfasttimer.h
index 48461df6ae..840d09d970 100644
--- a/indra/llcommon/llfasttimer.h
+++ b/indra/llcommon/llfasttimer.h
@@ -36,6 +36,10 @@
 // pull in the actual class definition
 #include "llfasttimer_class.h"
 
+//
+// Important note: These implementations must be FAST!
+//
+
 #if LL_WINDOWS
 //
 // Windows implementation of CPU clock
@@ -99,15 +103,17 @@ inline U64 LLFastTimer::getCPUClockCount64()
 #endif
 
 
-#if LL_LINUX || LL_SOLARIS
+#if (LL_LINUX || LL_SOLARIS) && !(defined(__i386__) || defined(__amd64__))
 //
-// Linux and Solaris implementation of CPU clock - all architectures.
+// Linux and Solaris implementation of CPU clock - non-x86.
+// This is accurate but SLOW!  Only use out of desperation.
 //
 // Try to use the MONOTONIC clock if available, this is a constant time counter
-// with nanosecond resolution (but not necessarily accuracy) and attempts are made
-// to synchronize this value between cores at kernel start. It should not be affected
-// by CPU frequency. If not available use the REALTIME clock, but this may be affected by
-// NTP adjustments or other user activity affecting the system time.
+// with nanosecond resolution (but not necessarily accuracy) and attempts are
+// made to synchronize this value between cores at kernel start. It should not
+// be affected by CPU frequency. If not available use the REALTIME clock, but
+// this may be affected by NTP adjustments or other user activity affecting
+// the system time.
 inline U64 LLFastTimer::getCPUClockCount64()
 {
 	struct timespec tp;
@@ -124,12 +130,12 @@ inline U32 LLFastTimer::getCPUClockCount32()
 {
 	return (U32)(LLFastTimer::getCPUClockCount64() >> 8);
 }
-#endif // (LL_LINUX || LL_SOLARIS))
+#endif // (LL_LINUX || LL_SOLARIS) && !(defined(__i386__) || defined(__amd64__))
 
 
-#if (LL_DARWIN) && (defined(__i386__) || defined(__amd64__))
+#if (LL_LINUX || LL_SOLARIS || LL_DARWIN) && (defined(__i386__) || defined(__amd64__))
 //
-// Mac x86 implementation of CPU clock
+// Mac+Linux+Solaris FAST x86 implementation of CPU clock
 inline U32 LLFastTimer::getCPUClockCount32()
 {
 	U64 x;