From mboxrd@z Thu Jan 1 00:00:00 1970 From: Fan Du Subject: [PATCH net-next] sctp: Pack dst_cookie into 1st cacheline hole for 64bit host Date: Mon, 5 Aug 2013 17:13:03 +0800 Message-ID: <1375693983-22824-1-git-send-email-fan.du@windriver.com> Mime-Version: 1.0 Content-Type: text/plain Cc: , To: , Return-path: Received: from mail.windriver.com ([147.11.1.11]:61293 "EHLO mail.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754730Ab3HEJNE (ORCPT ); Mon, 5 Aug 2013 05:13:04 -0400 Sender: netdev-owner@vger.kernel.org List-ID: 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 --- include/net/sctp/structs.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h index c0f4e29..d9c93a7 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 *, -- 1.7.9.5