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kernel: add a few patches for avoiding unnecessary skb reallocations - significantly improves ethernet<->wireless performance with mac80211 based drivers

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31886 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nbd
2012-05-27 14:43:58 +00:00
parent 878544bb07
commit 4cf70ab2e1
3 changed files with 59 additions and 0 deletions
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28
target/linux/generic/patches-3.3/653-disable_netlink_trim.patch Normal file
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@@ -0,0 +1,28 @@
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -854,25 +854,7 @@ void netlink_detachskb(struct sock *sk,
static struct sk_buff *netlink_trim(struct sk_buff *skb, gfp_t allocation)
{
- int delta;
-
skb_orphan(skb);
-
- delta = skb->end - skb->tail;
- if (delta * 2 < skb->truesize)
- return skb;
-
- if (skb_shared(skb)) {
- struct sk_buff *nskb = skb_clone(skb, allocation);
- if (!nskb)
- return skb;
- kfree_skb(skb);
- skb = nskb;
- }
-
- if (!pskb_expand_head(skb, 0, -delta, allocation))
- skb->truesize -= delta;
-
return skb;
}