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authorEric Dumazet <eric.dumazet@gmail.com>2010-11-30 22:04:07 +0300
committerDavid S. Miller <davem@davemloft.net>2010-12-10 07:05:58 +0300
commit68835aba4d9b74e2f94106d13b6a4bddc447c4c8 (patch)
tree468a9465acfa027791facef13fb6ef5129dda257 /include/net/inet_sock.h
parentdefb3519a64141608725e2dac5a5aa9a3c644bae (diff)
downloadlinux-68835aba4d9b74e2f94106d13b6a4bddc447c4c8.tar.xz
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/inet_sock.h')
-rw-r--r--include/net/inet_sock.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index 8945f9fb192a..8181498fa96c 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;