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authorIlpo Järvinen <ilpo.jarvinen@helsinki.fi>2007-10-18 05:07:57 -0700
committerDavid S. Miller <davem@davemloft.net>2007-10-18 05:07:57 -0700
commitdf2e014bfbbf26d160e1bf47b05fc05c96205e2b (patch)
treea474eb50c7d22be7d725ff0f6f6e8cb8d84c4eae /net/ipv4
parentbfaae0f04c68bafc12ec50c6922d71a90deea3e2 (diff)
[TCP]: Remove lost_retrans zero seqno special cases
Both high-sack detection and new lowest seq variables have unnecessary zero special case which are now removed by setting safe initial seqnos. This also fixes problem which caused zero received_upto being passed to tcp_mark_lost_retrans which confused after relations within the marker loop causing incorrect TCPCB_SACKED_RETRANS clearing. The problem was noticed because of a performance report from TAKANO Ryousei <takano@axe-inc.co.jp>. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> Acked-by: Ryousei Takano <takano-ryousei@aist.go.jp> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/tcp_input.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 0f00966b178..9288220b73a 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1121,7 +1121,7 @@ static int tcp_mark_lost_retrans(struct sock *sk, u32 received_upto)
struct sk_buff *skb;
int flag = 0;
int cnt = 0;
- u32 new_low_seq = 0;
+ u32 new_low_seq = tp->snd_nxt;
tcp_for_write_queue(skb, sk) {
u32 ack_seq = TCP_SKB_CB(skb)->ack_seq;
@@ -1153,7 +1153,7 @@ static int tcp_mark_lost_retrans(struct sock *sk, u32 received_upto)
NET_INC_STATS_BH(LINUX_MIB_TCPLOSTRETRANSMIT);
}
} else {
- if (!new_low_seq || before(ack_seq, new_low_seq))
+ if (before(ack_seq, new_low_seq))
new_low_seq = ack_seq;
cnt += tcp_skb_pcount(skb);
}
@@ -1242,7 +1242,7 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
int num_sacks = (ptr[1] - TCPOLEN_SACK_BASE)>>3;
int reord = tp->packets_out;
int prior_fackets;
- u32 highest_sack_end_seq = 0;
+ u32 highest_sack_end_seq = tp->lost_retrans_low;
int flag = 0;
int found_dup_sack = 0;
int cached_fack_count;