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[NET]: Implement SKB fast cloning.

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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>
This commit is contained in:
David S. Miller
2005-08-17 14:57:30 -07:00
committed by David S. Miller
parent e92ae93a8a
commit d179cd1292
4 changed files with 97 additions and 15 deletions
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2
include/net/sock.h
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@@ -1200,7 +1200,7 @@ static inline struct sk_buff *sk_stream_alloc_pskb(struct sock *sk,
int hdr_len;
hdr_len = SKB_DATA_ALIGN(sk->sk_prot->max_header);
skb = alloc_skb(size + hdr_len, gfp);
skb = alloc_skb_fclone(size + hdr_len, gfp);
if (skb) {
skb->truesize += mem;
if (sk->sk_forward_alloc >= (int)skb->truesize ||