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authorEric Dumazet <edumazet@google.com>2013-10-03 14:27:25 -0700
committerDavid S. Miller <davem@davemloft.net>2013-10-03 17:43:39 -0400
commit96f817fedec48b59c9e8b22141cec4e56ad47913 (patch)
tree81ca60148cfc015a3cfdb5b4d14a7b23f41cf2ac /net/ipv4/inet_timewait_sock.c
parentatl1e: enable support for NETIF_F_RXALL and NETIF_F_RXCRC features (diff)
downloadlinux-dev-96f817fedec48b59c9e8b22141cec4e56ad47913.tar.xz
linux-dev-96f817fedec48b59c9e8b22141cec4e56ad47913.zip
tcp: shrink tcp6_timewait_sock by one cache line
While working on tcp listener refactoring, I found that it would really make things easier if sock_common could include the IPv6 addresses needed in the lookups, instead of doing very complex games to get their values (depending on sock being SYN_RECV, ESTABLISHED, TIME_WAIT) For this to happen, I need to be sure that tcp6_timewait_sock and tcp_timewait_sock consume same number of cache lines. This is possible if we only use 32bits for tw_ttd, as we remove one 32bit hole in inet_timewait_sock inet_tw_time_stamp() is defined and used, even if its current implementation looks like tcp_time_stamp : We might need finer resolution for tcp_time_stamp in the future. Before patch : sizeof(struct tcp6_timewait_sock) = 0xc8 After patch : sizeof(struct tcp6_timewait_sock) = 0xc0 Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/inet_timewait_sock.c')
-rw-r--r--net/ipv4/inet_timewait_sock.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c
index 1f27c9f4afd0..9bcd8f7234ec 100644
--- a/net/ipv4/inet_timewait_sock.c
+++ b/net/ipv4/inet_timewait_sock.c
@@ -387,11 +387,11 @@ void inet_twsk_schedule(struct inet_timewait_sock *tw,
if (slot >= INET_TWDR_TWKILL_SLOTS)
slot = INET_TWDR_TWKILL_SLOTS - 1;
}
- tw->tw_ttd = jiffies + timeo;
+ tw->tw_ttd = inet_tw_time_stamp() + timeo;
slot = (twdr->slot + slot) & (INET_TWDR_TWKILL_SLOTS - 1);
list = &twdr->cells[slot];
} else {
- tw->tw_ttd = jiffies + (slot << INET_TWDR_RECYCLE_TICK);
+ tw->tw_ttd = inet_tw_time_stamp() + (slot << INET_TWDR_RECYCLE_TICK);
if (twdr->twcal_hand < 0) {
twdr->twcal_hand = 0;