[PATCH 6/6] [TCP]: Reorganize struct tcp_sock to save 16 bytes on 64-bit arch
From: Arnaldo Carvalho de Melo <hidden>
Date: 2008-01-31 18:32:06
Subsystem:
networking [tcp], the rest · Maintainers:
Eric Dumazet, Neal Cardwell, Linus Torvalds
/home/acme/git/net-2.6/net/ipv6/tcp_ipv6.c: struct tcp_sock | -16 struct tcp6_sock | -16 2 structs changed Now it is at: /* size: 1552, cachelines: 25 */ /* paddings: 2, sum paddings: 8 */ /* last cacheline: 16 bytes */ As soon as we stop using skb_queue_list we'll get it down to 24 cachelines. Signed-off-by: Arnaldo Carvalho de Melo <redacted> --- include/linux/tcp.h | 6 ++++-- 1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 08027f1..f48644d 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h@@ -304,7 +304,6 @@ struct tcp_sock { u32 rtt_seq; /* sequence number to update rttvar */ u32 packets_out; /* Packets which are "in flight" */ - u32 retrans_out; /* Retransmitted packets out */ /* * Options received (usually on last packet, some only on SYN packets). */
@@ -332,6 +331,8 @@ struct tcp_sock { struct tcp_sack_block recv_sack_cache[4]; + u32 retrans_out; /* Retransmitted packets out */ + struct sk_buff *highest_sack; /* highest skb with SACK received * (validity guaranteed only if * sacked_out > 0)
@@ -372,7 +373,6 @@ struct tcp_sock { unsigned int keepalive_time; /* time before keep alive takes place */ unsigned int keepalive_intvl; /* time interval between keep alive probes */ - int linger2; unsigned long last_synq_overflow;
@@ -398,6 +398,8 @@ struct tcp_sock { u32 probe_seq_end; } mtu_probe; + int linger2; + #ifdef CONFIG_TCP_MD5SIG /* TCP AF-Specific parts; only used by MD5 Signature support so far */ struct tcp_sock_af_ops *af_specific;
--
1.5.3.8