From 068a2de57ddf4f472e32e7af868613c574ad1d88 Mon Sep 17 00:00:00 2001
From: Krishna Kumar <krkumar2@in.ibm.com>
Date: Wed, 9 Dec 2009 20:59:58 +0000
Subject: [PATCH] net: release dst entry while cache-hot for GSO case too
Non-GSO code drops dst entry for performance reasons, but
the same is missing for GSO code. Drop dst while cache-hot
for GSO case too.
Signed-off-by: Krishna Kumar <krkumar2@in.ibm.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/core/dev.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/net/core/dev.c b/net/core/dev.c
index be9924f60ec3..a8d68cdedbbe 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1853,6 +1853,14 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
skb->next = nskb->next;
nskb->next = NULL;
+
+ /*
+ * If device doesnt need nskb->dst, release it right now while
+ * its hot in this cpu cache
+ */
+ if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
+ skb_dst_drop(nskb);
+
rc = ops->ndo_start_xmit(nskb, dev);
if (unlikely(rc != NETDEV_TX_OK)) {
if (rc & ~NETDEV_TX_MASK)
--
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