hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

tcp: better use ooo_last_skb in tcp_data_queue_ofo() 

Willem noticed that we could avoid an rbtree lookup if the
the attempt to coalesce incoming skb to the last skb failed
for some reason.

Since most ooo additions are at the tail, this is definitely
worth adding a test and fast path.

Suggested-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Yaogong Wang <wygivan@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2016-09-09 14:22:45 -07:00 committed by David S. Miller
parent ed227099da
commit 2594a2a928
1 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
net/ipv4/tcp_input.c
View File

@ -4461,6 +4461,12 @@ coalesce_done:
skb = NULL; skb = NULL;
goto add_sack; goto add_sack;
} }
/* Can avoid an rbtree lookup if we are adding skb after ooo_last_skb */
if (!before(seq, TCP_SKB_CB(tp->ooo_last_skb)->end_seq)) {
parent = &tp->ooo_last_skb->rbnode;
p = &parent->rb_right;
goto insert;
}
/* Find place to insert this segment. Handle overlaps on the way. */ /* Find place to insert this segment. Handle overlaps on the way. */
parent = NULL; parent = NULL;
@ -4503,7 +4509,7 @@ coalesce_done:
} }
p = &parent->rb_right; p = &parent->rb_right;
} }
insert:
/* Insert segment into RB tree. */ /* Insert segment into RB tree. */
rb_link_node(&skb->rbnode, parent, p); rb_link_node(&skb->rbnode, parent, p);
rb_insert_color(&skb->rbnode, &tp->out_of_order_queue); rb_insert_color(&skb->rbnode, &tp->out_of_order_queue);