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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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15
include/linux/tcp.h
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@@ -307,6 +307,21 @@ struct tcp_sock {
struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */
struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/
struct tcp_sack_block recv_sack_cache[4];
/* from STCP, retrans queue hinting */
struct sk_buff* lost_skb_hint;
struct sk_buff *scoreboard_skb_hint;
struct sk_buff *retransmit_skb_hint;
struct sk_buff *forward_skb_hint;
struct sk_buff *fastpath_skb_hint;
int fastpath_cnt_hint;
int lost_cnt_hint;
int retransmit_cnt_hint;
int forward_cnt_hint;
__u16 advmss; /* Advertised MSS */
__u16 prior_ssthresh; /* ssthresh saved at recovery start */
__u32 lost_out; /* Lost packets */