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| author | Felix Fietkau <nbd@openwrt.org> | 2012-05-27 14:43:58 +0000 |
|---|---|---|
| committer | Felix Fietkau <nbd@openwrt.org> | 2012-05-27 14:43:58 +0000 |
| commit | 6f89cffc9add6939d44a6b54cf9a5e77849aa7fd (patch) | |
| tree | 8b496d502de38bab52a4914aaa2338cbd43d0753 /target/linux/generic/patches-3.3/654-avoid_skb_cow_realloc.patch | |
| parent | ec7786c2ecd4ab717c84a53a992a8d23dd01bcdc (diff) | |
| download | mtk-20170518-6f89cffc9add6939d44a6b54cf9a5e77849aa7fd.zip mtk-20170518-6f89cffc9add6939d44a6b54cf9a5e77849aa7fd.tar.gz mtk-20170518-6f89cffc9add6939d44a6b54cf9a5e77849aa7fd.tar.bz2 | |
kernel: add a few patches for avoiding unnecessary skb reallocations - significantly improves ethernet<->wireless performance with mac80211 based drivers
SVN-Revision: 31886
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 0000000..dfa9819 --- /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, |