diff options
| author | nbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73> | 2012-05-27 14:43:58 +0000 |
|---|---|---|
| committer | nbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73> | 2012-05-27 14:43:58 +0000 |
| commit | 4cf70ab2e1f2f6b50ccd8d62471507f253c4c003 (patch) | |
| tree | 437afa2ce20c1a5e28af78144db40d717f81bc48 /target/linux/generic/patches-3.3/654-avoid_skb_cow_realloc.patch | |
| parent | 878544bb079df3585b319d65f18633586d57964e (diff) | |
kernel: add a few patches for avoiding unnecessary skb reallocations - significantly improves ethernet<->wireless performance with mac80211 based drivers
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31886 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/generic/patches-3.3/654-avoid_skb_cow_realloc.patch')
| -rw-r--r-- | target/linux/generic/patches-3.3/654-avoid_skb_cow_realloc.patch | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.3/654-avoid_skb_cow_realloc.patch b/target/linux/generic/patches-3.3/654-avoid_skb_cow_realloc.patch new file mode 100644 index 000000000..dfa98198e --- /dev/null +++ b/target/linux/generic/patches-3.3/654-avoid_skb_cow_realloc.patch @@ -0,0 +1,20 @@ +--- a/include/linux/skbuff.h ++++ b/include/linux/skbuff.h +@@ -1850,12 +1850,15 @@ static inline int skb_clone_writable(con + static inline int __skb_cow(struct sk_buff *skb, unsigned int headroom, + int cloned) + { ++ unsigned int alloc_headroom = headroom; + int delta = 0; + + if (headroom < NET_SKB_PAD) +- headroom = NET_SKB_PAD; +- if (headroom > skb_headroom(skb)) ++ alloc_headroom = NET_SKB_PAD; ++ if (headroom > skb_headroom(skb) || ++ (cloned && alloc_headroom > skb_headroom(skb))) { + delta = headroom - skb_headroom(skb); ++ } + + if (delta || cloned) + return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD), 0, |