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syncookies: remove last_synq_overflow from struct tcp_sock

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last_synq_overflow eats 4 or 8 bytes in struct tcp_sock, even
though it is only used when a listening sockets syn queue
is full.

We can (ab)use rx_opt.ts_recent_stamp to store the same information;
it is not used otherwise as long as a socket is in listen state.

Move linger2 around to avoid splitting struct mtu_probe
across cacheline boundary on 32 bit arches.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2009-04-19 09:43:48 +00:00 • committed by David S. Miller
parent 7eebb0b28f
commit a0f82f64e2
4 changed files with 18 additions and 8 deletions
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4
include/linux/tcp.h
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@ -377,7 +377,7 @@ struct tcp_sock {
unsigned int keepalive_time; /* time before keep alive takes place */
unsigned int keepalive_intvl; /* time interval between keep alive probes */
unsigned long last_synq_overflow;
int linger2;
/* Receiver side RTT estimation */
struct {
@ -406,8 +406,6 @@ struct tcp_sock {
/* TCP MD5 Signagure Option information */
struct tcp_md5sig_info *md5sig_info;
#endif
int linger2;
};
static inline struct tcp_sock *tcp_sk(const struct sock *sk)