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-rw-r--r--net/sched/Kconfig4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/sched/Kconfig b/net/sched/Kconfig
index 45d3bc0812c..81510da3179 100644
--- a/net/sched/Kconfig
+++ b/net/sched/Kconfig
@@ -72,9 +72,11 @@ config NET_SCH_CLK_GETTIMEOFDAY
Choose this if you need a high resolution clock source but can't use
the CPU's cycle counter.
+# don't allow on SMP x86 because they can have unsynchronized TSCs.
+# gettimeofday is a good alternative
config NET_SCH_CLK_CPU
bool "CPU cycle counter"
- depends on X86_TSC || X86_64 || ALPHA || SPARC64 || PPC64 || IA64
+ depends on ((X86_TSC || X86_64) && !SMP) || ALPHA || SPARC64 || PPC64 || IA64
help
Say Y here if you want to use the CPU's cycle counter as clock source.
This is a cheap and high resolution clock source, but on some