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authorDavid S. Miller <davem@davemloft.net>2005-08-17 14:57:30 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2005-08-29 16:01:54 -0700
commitd179cd12928443f3ec29cfbc3567439644bd0afc (patch)
tree0bfc57e73f0bf9f7bb9d5c8ce7d3d5afe550f94e /net/ipv4/tcp_output.c
parente92ae93a8aa66aea12935420cb22d4df1c18d023 (diff)
downloadop-kernel-dev-d179cd12928443f3ec29cfbc3567439644bd0afc.zip
op-kernel-dev-d179cd12928443f3ec29cfbc3567439644bd0afc.tar.gz
[NET]: Implement SKB fast cloning.
Protocols that make extensive use of SKB cloning, for example TCP, eat at least 2 allocations per packet sent as a result. To cut the kmalloc() count in half, we implement a pre-allocation scheme wherein we allocate 2 sk_buff objects in advance, then use a simple reference count to free up the memory at the correct time. Based upon an initial patch by Thomas Graf and suggestions from Herbert Xu. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_output.c')
-rw-r--r--net/ipv4/tcp_output.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 8d92ab5..75b6811 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1582,7 +1582,7 @@ void tcp_send_fin(struct sock *sk)
} else {
/* Socket is locked, keep trying until memory is available. */
for (;;) {
- skb = alloc_skb(MAX_TCP_HEADER, GFP_KERNEL);
+ skb = alloc_skb_fclone(MAX_TCP_HEADER, GFP_KERNEL);
if (skb)
break;
yield();
@@ -1804,7 +1804,7 @@ int tcp_connect(struct sock *sk)
tcp_connect_init(sk);
- buff = alloc_skb(MAX_TCP_HEADER + 15, sk->sk_allocation);
+ buff = alloc_skb_fclone(MAX_TCP_HEADER + 15, sk->sk_allocation);
if (unlikely(buff == NULL))
return -ENOBUFS;
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