Openwrt/target/linux/ixp4xx/patches-2.6.30/600-dma_performance.patch

--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -260,6 +260,10 @@ struct sk_buff *__alloc_skb(unsigned int
 	if (!skb)
 		goto out;
 
+#ifdef CONFIG_ARCH_IXP4XX
+	gfp_mask |= GFP_DMA;
+#endif
+
 	size = SKB_DATA_ALIGN(size);
 	data = kmalloc_node_track_caller(size + sizeof(struct skb_shared_info),
 			gfp_mask, node);