path: root/include/net/inet_timewait_sock.h
diff options
authorEric Dumazet <eric.dumazet@gmail.com>2010-11-30 19:04:07 +0000
committerDavid S. Miller <davem@davemloft.net>2010-12-09 20:05:58 -0800
commit68835aba4d9b74e2f94106d13b6a4bddc447c4c8 (patch)
tree468a9465acfa027791facef13fb6ef5129dda257 /include/net/inet_timewait_sock.h
parentnet: Abstract away all dst_entry metrics accesses. (diff)
net: optimize INET input path further
Followup of commit b178bb3dfc30 (net: reorder struct sock fields) Optimize INET input path a bit further, by : 1) moving sk_refcnt close to sk_lock. This reduces number of dirtied cache lines by one on 64bit arches (and 64 bytes cache line size). 2) moving inet_daddr & inet_rcv_saddr at the beginning of sk (same cache line than hash / family / bound_dev_if / nulls_node) This reduces number of accessed cache lines in lookups by one, and dont increase size of inet and timewait socks. inet and tw sockets now share same place-holder for these fields. Before patch : offsetof(struct sock, sk_refcnt) = 0x10 offsetof(struct sock, sk_lock) = 0x40 offsetof(struct sock, sk_receive_queue) = 0x60 offsetof(struct inet_sock, inet_daddr) = 0x270 offsetof(struct inet_sock, inet_rcv_saddr) = 0x274 After patch : offsetof(struct sock, sk_refcnt) = 0x44 offsetof(struct sock, sk_lock) = 0x48 offsetof(struct sock, sk_receive_queue) = 0x68 offsetof(struct inet_sock, inet_daddr) = 0x0 offsetof(struct inet_sock, inet_rcv_saddr) = 0x4 compute_score() (udp or tcp) now use a single cache line per ignored item, instead of two. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
1 files changed, 7 insertions, 13 deletions
diff --git a/include/net/inet_timewait_sock.h b/include/net/inet_timewait_sock.h
index a066fdd50da6..17404b5388a7 100644
--- a/include/net/inet_timewait_sock.h
+++ b/include/net/inet_timewait_sock.h
@@ -88,12 +88,6 @@ extern void inet_twdr_hangman(unsigned long data);
extern void inet_twdr_twkill_work(struct work_struct *work);
extern void inet_twdr_twcal_tick(unsigned long data);
-#if (BITS_PER_LONG == 64)
struct inet_bind_bucket;
@@ -117,15 +111,15 @@ struct inet_timewait_sock {
#define tw_hash __tw_common.skc_hash
#define tw_prot __tw_common.skc_prot
#define tw_net __tw_common.skc_net
+#define tw_daddr __tw_common.skc_daddr
+#define tw_rcv_saddr __tw_common.skc_rcv_saddr
int tw_timeout;
volatile unsigned char tw_substate;
- /* 3 bits hole, try to pack */
unsigned char tw_rcv_wscale;
/* Socket demultiplex comparisons on incoming packets. */
- /* these five are in inet_sock */
+ /* these three are in inet_sock */
__be16 tw_sport;
- __be32 tw_daddr __attribute__((aligned(INET_TIMEWAIT_ADDRCMP_ALIGN_BYTES)));
- __be32 tw_rcv_saddr;
__be16 tw_dport;
__u16 tw_num;
@@ -191,10 +185,10 @@ static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
return (struct inet_timewait_sock *)sk;
-static inline __be32 inet_rcv_saddr(const struct sock *sk)
+static inline __be32 sk_rcv_saddr(const struct sock *sk)
- return likely(sk->sk_state != TCP_TIME_WAIT) ?
- inet_sk(sk)->inet_rcv_saddr : inet_twsk(sk)->tw_rcv_saddr;
+/* both inet_sk() and inet_twsk() store rcv_saddr in skc_rcv_saddr */
+ return sk->__sk_common.skc_rcv_saddr;
extern void inet_twsk_put(struct inet_timewait_sock *tw);