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[TCP]: speed up SACK processing

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Use "hints" to speed up the SACK processing. Various forms 
of this have been used by TCP developers (Web100, STCP, BIC)
to avoid the 2x linear search of outstanding segments.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger
2005-11-10 17:14:59 -08:00
committed by David S. Miller
parent caa20d9abe
commit 6a438bbe68
5 changed files with 202 additions and 26 deletions
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include/net/sock.h
+6
View File
@@ -1247,6 +1247,12 @@ static inline struct page *sk_stream_alloc_page(struct sock *sk)
(skb != (struct sk_buff *)&(sk)->sk_write_queue); \
skb = skb->next)
/*from STCP for fast SACK Process*/
#define sk_stream_for_retrans_queue_from(skb, sk) \
for (; (skb != (sk)->sk_send_head) && \
(skb != (struct sk_buff *)&(sk)->sk_write_queue); \
skb = skb->next)
/*
* Default write policy as shown to user space via poll/select/SIGIO
*/
include/net/tcp.h
+9
View File
@@ -1207,6 +1207,15 @@ static inline void tcp_mib_init(void)
TCP_ADD_STATS_USER(TCP_MIB_MAXCONN, -1);
}
/*from STCP */
static inline void clear_all_retrans_hints(struct tcp_sock *tp){
tp->lost_skb_hint = NULL;
tp->scoreboard_skb_hint = NULL;
tp->retransmit_skb_hint = NULL;
tp->forward_skb_hint = NULL;
tp->fastpath_skb_hint = NULL;
}
/* /proc */
enum tcp_seq_states {
TCP_SEQ_STATE_LISTENING,