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authorfan.du <fan.du@windriver.com>2013-08-05 17:13:03 +0800
committerDavid S. Miller <davem@davemloft.net>2013-08-05 12:20:51 -0700
commit5a139296f872d438f17f7219411321b603c1622b (patch)
tree205c06b348c85194810033ec6f469f446ef385ab /include/net/sctp
parente7f63f1dc4bd643d9249c653e60c530d4a438147 (diff)
sctp: Pack dst_cookie into 1st cacheline hole for 64bit host
As dst_cookie is used in fast path sctp_transport_dst_check. Before: struct sctp_transport { struct list_head transports; /* 0 16 */ atomic_t refcnt; /* 16 4 */ __u32 dead:1; /* 20:31 4 */ __u32 rto_pending:1; /* 20:30 4 */ __u32 hb_sent:1; /* 20:29 4 */ __u32 pmtu_pending:1; /* 20:28 4 */ /* XXX 28 bits hole, try to pack */ __u32 sack_generation; /* 24 4 */ /* XXX 4 bytes hole, try to pack */ struct flowi fl; /* 32 64 */ /* --- cacheline 1 boundary (64 bytes) was 32 bytes ago --- */ union sctp_addr ipaddr; /* 96 28 */ After: struct sctp_transport { struct list_head transports; /* 0 16 */ atomic_t refcnt; /* 16 4 */ __u32 dead:1; /* 20:31 4 */ __u32 rto_pending:1; /* 20:30 4 */ __u32 hb_sent:1; /* 20:29 4 */ __u32 pmtu_pending:1; /* 20:28 4 */ /* XXX 28 bits hole, try to pack */ __u32 sack_generation; /* 24 4 */ u32 dst_cookie; /* 28 4 */ struct flowi fl; /* 32 64 */ /* --- cacheline 1 boundary (64 bytes) was 32 bytes ago --- */ union sctp_addr ipaddr; /* 96 28 */ Signed-off-by: Fan Du <fan.du@windriver.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/sctp')
-rw-r--r--include/net/sctp/structs.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index c0f4e29eedd5..d9c93a77b1a9 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -782,6 +782,7 @@ struct sctp_transport {
/* Has this transport moved the ctsn since we last sacked */
__u32 sack_generation;
+ u32 dst_cookie;
struct flowi fl;
@@ -946,7 +947,6 @@ struct sctp_transport {
__u64 hb_nonce;
struct rcu_head rcu;
- u32 dst_cookie;
};
struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *,