1 files changed, 7 insertions, 0 deletions

diff --git a/arch/x86/include/asm/system.h b/arch/x86/include/asm/system.h
index e7f4d33c55e..33ecc3ea878 100644
--- a/arch/x86/include/asm/system.h
+++ b/arch/x86/include/asm/system.h
@@ -457,4 +457,11 @@ static __always_inline void rdtsc_barrier(void)
         alternative(ASM_NOP3, "lfence", X86_FEATURE_LFENCE_RDTSC);
 }
 
+/*
+ * We handle most unaligned accesses in hardware.  On the other hand
+ * unaligned DMA can be quite expensive on some Nehalem processors.
+ *
+ * Based on this we disable the IP header alignment in network drivers.
+ */
+#define NET_IP_ALIGN    0
 #endif /* _ASM_X86_SYSTEM_H */