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| author | Eric Dumazet <edumazet@google.com> | 2013-10-03 14:27:25 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-10-03 17:43:39 -0400 |
| commit | 96f817fedec48b59c9e8b22141cec4e56ad47913 (patch) | |
| tree | 81ca60148cfc015a3cfdb5b4d14a7b23f41cf2ac /net/ipv4/inet_timewait_sock.c | |
| parent | 40dc9ab277eb3d2d3d3442c20accb5dfa577e680 (diff) | |
| download | linux-96f817fedec48b59c9e8b22141cec4e56ad47913.tar.gz linux-96f817fedec48b59c9e8b22141cec4e56ad47913.tar.bz2 linux-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.c | 4 |
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; |