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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
parentdefb3519a64141608725e2dac5a5aa9a3c644bae (diff)
downloadop-kernel-dev-68835aba4d9b74e2f94106d13b6a4bddc447c4c8.zip
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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 'include/net')
-rw-r--r--include/net/inet_sock.h5
-rw-r--r--include/net/inet_timewait_sock.h20
-rw-r--r--include/net/sock.h37
3 files changed, 34 insertions, 28 deletions
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index 8945f9f..8181498 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -116,8 +116,9 @@ struct inet_sock {
struct ipv6_pinfo *pinet6;
#endif
/* Socket demultiplex comparisons on incoming packets. */
- __be32 inet_daddr;
- __be32 inet_rcv_saddr;
+#define inet_daddr sk.__sk_common.skc_daddr
+#define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr
+
__be16 inet_dport;
__u16 inet_num;
__be32 inet_saddr;
diff --git a/include/net/inet_timewait_sock.h b/include/net/inet_timewait_sock.h
index a066fdd..17404b5 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)
-#define INET_TIMEWAIT_ADDRCMP_ALIGN_BYTES 8
-#else
-#define INET_TIMEWAIT_ADDRCMP_ALIGN_BYTES 4
-#endif
-
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;
kmemcheck_bitfield_begin(flags);
@@ -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);
diff --git a/include/net/sock.h b/include/net/sock.h
index 3482004..82e8603 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -105,10 +105,8 @@ struct net;
/**
* struct sock_common - minimal network layer representation of sockets
- * @skc_node: main hash linkage for various protocol lookup tables
- * @skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol
- * @skc_refcnt: reference count
- * @skc_tx_queue_mapping: tx queue number for this connection
+ * @skc_daddr: Foreign IPv4 addr
+ * @skc_rcv_saddr: Bound local IPv4 addr
* @skc_hash: hash value used with various protocol lookup tables
* @skc_u16hashes: two u16 hash values used by UDP lookup tables
* @skc_family: network address family
@@ -119,20 +117,20 @@ struct net;
* @skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol
* @skc_prot: protocol handlers inside a network family
* @skc_net: reference to the network namespace of this socket
+ * @skc_node: main hash linkage for various protocol lookup tables
+ * @skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol
+ * @skc_tx_queue_mapping: tx queue number for this connection
+ * @skc_refcnt: reference count
*
* This is the minimal network layer representation of sockets, the header
* for struct sock and struct inet_timewait_sock.
*/
struct sock_common {
- /*
- * first fields are not copied in sock_copy()
+ /* skc_daddr and skc_rcv_saddr must be grouped :
+ * cf INET_MATCH() and INET_TW_MATCH()
*/
- union {
- struct hlist_node skc_node;
- struct hlist_nulls_node skc_nulls_node;
- };
- atomic_t skc_refcnt;
- int skc_tx_queue_mapping;
+ __be32 skc_daddr;
+ __be32 skc_rcv_saddr;
union {
unsigned int skc_hash;
@@ -150,6 +148,18 @@ struct sock_common {
#ifdef CONFIG_NET_NS
struct net *skc_net;
#endif
+ /*
+ * fields between dontcopy_begin/dontcopy_end
+ * are not copied in sock_copy()
+ */
+ int skc_dontcopy_begin[0];
+ union {
+ struct hlist_node skc_node;
+ struct hlist_nulls_node skc_nulls_node;
+ };
+ int skc_tx_queue_mapping;
+ atomic_t skc_refcnt;
+ int skc_dontcopy_end[0];
};
/**
@@ -232,7 +242,8 @@ struct sock {
#define sk_refcnt __sk_common.skc_refcnt
#define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping
-#define sk_copy_start __sk_common.skc_hash
+#define sk_dontcopy_begin __sk_common.skc_dontcopy_begin
+#define sk_dontcopy_end __sk_common.skc_dontcopy_end
#define sk_hash __sk_common.skc_hash
#define sk_family __sk_common.skc_family
#define sk_state __sk_common.skc_state
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