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| author |   Eric Dumazet <eric.dumazet@gmail.com> | 2009-10-05 00:11:22 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2009-10-05 00:21:57 -0700 |
| commit | 0bfbedb14a8a96c529341bec88991a92b41fac72 (patch) | |
| tree | d52ccb4758fd58cbf74c7a9001e6885275d3ddc8 /net/ipv4/ip_gre.c | |
| parent | ipv4: fib table algorithm performance improvement (diff) | |
| download | linux-dev-0bfbedb14a8a96c529341bec88991a92b41fac72.tar.xz linux-dev-0bfbedb14a8a96c529341bec88991a92b41fac72.zip | |
tunnels: Optimize tx path
We currently dirty a cache line to update tunnel device stats
(tx_packets/tx_bytes). We better use the txq->tx_bytes/tx_packets
counters that already are present in cpu cache, in the cache
line shared with txq->_xmit_lock
This patch extends IPTUNNEL_XMIT() macro to use txq pointer
provided by the caller.
Also &tunnel->dev->stats can be replaced by &dev->stats
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_gre.c')
| -rw-r--r-- | net/ipv4/ip_gre.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index 41ada9904d31..89ff9d5b1500 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -662,7 +662,8 @@ drop_nolock: static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) { struct ip_tunnel *tunnel = netdev_priv(dev); - struct net_device_stats *stats = &tunnel->dev->stats; + struct net_device_stats *stats = &dev->stats; + struct netdev_queue *txq = netdev_get_tx_queue(dev, 0); struct iphdr *old_iph = ip_hdr(skb); struct iphdr *tiph; u8 tos; @@ -810,7 +811,7 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); if (!new_skb) { ip_rt_put(rt); - stats->tx_dropped++; + txq->tx_dropped++; dev_kfree_skb(skb); return NETDEV_TX_OK; } |