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author | Felix Fietkau <nbd@openwrt.org> | 2009-05-10 22:17:50 +0000 |
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committer | Felix Fietkau <nbd@openwrt.org> | 2009-05-10 22:17:50 +0000 |
commit | 713ddc419aef331ae12b5601244a001e5a728c8f (patch) | |
tree | 32a654d37cf7688c9c4579b889aba996abed54c0 /target/linux/generic-2.6/patches-2.6.29/205-skb_padding.patch | |
parent | ed9208de6f66876d65269d91469f3ee498c6825a (diff) | |
download | upstream-713ddc419aef331ae12b5601244a001e5a728c8f.tar.gz upstream-713ddc419aef331ae12b5601244a001e5a728c8f.tar.bz2 upstream-713ddc419aef331ae12b5601244a001e5a728c8f.zip |
improve the skb padding performance change to avoid unnecessary reallocations in the routing code
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@15761 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/generic-2.6/patches-2.6.29/205-skb_padding.patch')
-rw-r--r-- | target/linux/generic-2.6/patches-2.6.29/205-skb_padding.patch | 48 |
1 files changed, 44 insertions, 4 deletions
diff --git a/target/linux/generic-2.6/patches-2.6.29/205-skb_padding.patch b/target/linux/generic-2.6/patches-2.6.29/205-skb_padding.patch index c11bffe550..ff05b8d930 100644 --- a/target/linux/generic-2.6/patches-2.6.29/205-skb_padding.patch +++ b/target/linux/generic-2.6/patches-2.6.29/205-skb_padding.patch @@ -1,16 +1,56 @@ --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h -@@ -1306,9 +1306,12 @@ +@@ -1306,11 +1306,18 @@ static inline int skb_network_offset(con * * Various parts of the networking layer expect at least 16 bytes of * headroom, you should not reduce this. + * + * This has been changed to 64 to acommodate for routing between ethernet -+ * and wireless ++ * and wireless, but only for new allocations */ #ifndef NET_SKB_PAD --#define NET_SKB_PAD 16 -+#define NET_SKB_PAD 64 + #define NET_SKB_PAD 16 #endif ++#ifndef NET_SKB_PAD_ALLOC ++#define NET_SKB_PAD_ALLOC 64 ++#endif ++ extern int ___pskb_trim(struct sk_buff *skb, unsigned int len); + + static inline void __skb_trim(struct sk_buff *skb, unsigned int len) +@@ -1400,9 +1407,9 @@ static inline void __skb_queue_purge(str + static inline struct sk_buff *__dev_alloc_skb(unsigned int length, + gfp_t gfp_mask) + { +- struct sk_buff *skb = alloc_skb(length + NET_SKB_PAD, gfp_mask); ++ struct sk_buff *skb = alloc_skb(length + NET_SKB_PAD_ALLOC, gfp_mask); + if (likely(skb)) +- skb_reserve(skb, NET_SKB_PAD); ++ skb_reserve(skb, NET_SKB_PAD_ALLOC); + return skb; + } + +@@ -1475,7 +1482,7 @@ static inline int __skb_cow(struct sk_bu + delta = headroom - skb_headroom(skb); + + if (delta || cloned) +- return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD), 0, ++ return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD_ALLOC), 0, + GFP_ATOMIC); + return 0; + } +--- a/net/core/skbuff.c ++++ b/net/core/skbuff.c +@@ -320,9 +320,9 @@ struct sk_buff *__netdev_alloc_skb(struc + int node = dev->dev.parent ? dev_to_node(dev->dev.parent) : -1; + struct sk_buff *skb; + +- skb = __alloc_skb(length + NET_SKB_PAD, gfp_mask, 0, node); ++ skb = __alloc_skb(length + NET_SKB_PAD_ALLOC, gfp_mask, 0, node); + if (likely(skb)) { +- skb_reserve(skb, NET_SKB_PAD); ++ skb_reserve(skb, NET_SKB_PAD_ALLOC); + skb->dev = dev; + } + return skb; |