diff -ru linux-2.6.18/include/linux/sysctl.h linux-2.6.18.new/include/linux/sysctl.h --- linux-2.6.18/include/linux/sysctl.h 2006-09-19 20:42:06.000000000 -0700 +++ linux-2.6.18.new/include/linux/sysctl.h 2006-09-26 17:10:36.000000000 -0700 @@ -411,6 +411,8 @@ NET_IPV4_TCP_WORKAROUND_SIGNED_WINDOWS=115, NET_TCP_DMA_COPYBREAK=116, NET_TCP_SLOW_START_AFTER_IDLE=117, + NET_TCP_RTO_MAX=118, + NET_TCP_RTO_INIT=119, }; enum { Only in linux-2.6.18.new/include/linux: sysctl.h.orig Only in linux-2.6.18.new/include/linux: sysctl.h.rej diff -ru linux-2.6.18/include/linux/tcp.h linux-2.6.18.new/include/linux/tcp.h --- linux-2.6.18/include/linux/tcp.h 2006-09-19 20:42:06.000000000 -0700 +++ linux-2.6.18.new/include/linux/tcp.h 2006-09-26 17:08:33.000000000 -0700 @@ -94,6 +94,8 @@ #define TCP_INFO 11 /* Information about this connection. */ #define TCP_QUICKACK 12 /* Block/reenable quick acks */ #define TCP_CONGESTION 13 /* Congestion control algorithm */ +#define TCP_BACKOFF_MAX 14 /* Maximum backoff value */ +#define TCP_BACKOFF_INIT 15 /* Initial backoff value */ #define TCPI_OPT_TIMESTAMPS 1 #define TCPI_OPT_SACK 2 @@ -257,6 +259,8 @@ __u8 frto_counter; /* Number of new acks after RTO */ __u8 nonagle; /* Disable Nagle algorithm? */ __u8 keepalive_probes; /* num of allowed keep alive probes */ + __u32 rto_max; /* Maximum backoff value */ + __u32 rto_init; /* Initial backoff value */ /* RTT measurement */ __u32 srtt; /* smoothed round trip time << 3 */ Only in linux-2.6.18.new/include/linux: tcp.h.orig diff -ru linux-2.6.18/include/net/tcp.h linux-2.6.18.new/include/net/tcp.h --- linux-2.6.18/include/net/tcp.h 2006-09-19 20:42:06.000000000 -0700 +++ linux-2.6.18.new/include/net/tcp.h 2006-09-26 17:12:04.000000000 -0700 @@ -227,6 +227,8 @@ extern int sysctl_tcp_base_mss; extern int sysctl_tcp_workaround_signed_windows; extern int sysctl_tcp_slow_start_after_idle; +extern int sysctl_tcp_rto_max; +extern int sysctl_tcp_rto_init; extern atomic_t tcp_memory_allocated; extern atomic_t tcp_sockets_allocated; Only in linux-2.6.18.new/include/net: tcp.h.orig Only in linux-2.6.18.new/include/net: tcp.h.rej diff -ru linux-2.6.18/net/ipv4/sysctl_net_ipv4.c linux-2.6.18.new/net/ipv4/sysctl_net_ipv4.c --- linux-2.6.18/net/ipv4/sysctl_net_ipv4.c 2006-09-19 20:42:06.000000000 -0700 +++ linux-2.6.18.new/net/ipv4/sysctl_net_ipv4.c 2006-09-26 17:08:33.000000000 -0700 @@ -697,6 +697,22 @@ .mode = 0644, .proc_handler = &proc_dointvec }, + { + .ctl_name = NET_TCP_RTO_MAX, + .procname = "tcp_rto_max", + .data = &sysctl_tcp_rto_max, + .maxlen = sizeof(unsigned), + .mode = 0644, + .proc_handler = &proc_dointvec + }, + { + .ctl_name = NET_TCP_RTO_INIT, + .procname = "tcp_rto_init", + .data = &sysctl_tcp_rto_init, + .maxlen = sizeof(unsigned), + .mode = 0644, + .proc_handler = &proc_dointvec + }, { .ctl_name = 0 } }; Only in linux-2.6.18.new/net/ipv4: sysctl_net_ipv4.c.orig diff -ru linux-2.6.18/net/ipv4/tcp.c linux-2.6.18.new/net/ipv4/tcp.c --- linux-2.6.18/net/ipv4/tcp.c 2006-09-19 20:42:06.000000000 -0700 +++ linux-2.6.18.new/net/ipv4/tcp.c 2006-09-26 17:08:33.000000000 -0700 @@ -1939,6 +1939,21 @@ } break; + case TCP_BACKOFF_MAX: + if (val < 1) + err = -EINVAL; + else + tp->rto_max = val * HZ; + break; + + case TCP_BACKOFF_INIT: + if (val < 1) + err = -EINVAL; + else + tp->rto_init = val * HZ; + break; + + default: err = -ENOPROTOOPT; break; @@ -2110,6 +2125,12 @@ if (copy_to_user(optval, icsk->icsk_ca_ops->name, len)) return -EFAULT; return 0; + case TCP_BACKOFF_MAX: + val = (tp->rto_max ? : sysctl_tcp_rto_max) / HZ; + break; + case TCP_BACKOFF_INIT: + val = (tp->rto_init ? : sysctl_tcp_rto_init) / HZ; + break; default: return -ENOPROTOOPT; }; Only in linux-2.6.18.new/net/ipv4: tcp.c.orig diff -ru linux-2.6.18/net/ipv4/tcp_timer.c linux-2.6.18.new/net/ipv4/tcp_timer.c --- linux-2.6.18/net/ipv4/tcp_timer.c 2006-09-19 20:42:06.000000000 -0700 +++ linux-2.6.18.new/net/ipv4/tcp_timer.c 2006-09-26 17:08:33.000000000 -0700 @@ -31,6 +31,8 @@ int sysctl_tcp_retries1 = TCP_RETR1; int sysctl_tcp_retries2 = TCP_RETR2; int sysctl_tcp_orphan_retries; +int sysctl_tcp_rto_max = TCP_RTO_MAX; +int sysctl_tcp_rto_init = TCP_TIMEOUT_INIT; static void tcp_write_timer(unsigned long); static void tcp_delack_timer(unsigned long); @@ -71,7 +73,8 @@ /* If peer does not open window for long time, or did not transmit * anything for long time, penalize it. */ - if ((s32)(tcp_time_stamp - tp->lsndtime) > 2*TCP_RTO_MAX || !do_reset) + if ((s32)(tcp_time_stamp - tp->lsndtime) > + 2 * (tp->rto_max ? : sysctl_tcp_rto_max) || !do_reset) orphans <<= 1; /* If some dubious ICMP arrived, penalize even more. */ @@ -256,8 +259,8 @@ max_probes = sysctl_tcp_retries2; if (sock_flag(sk, SOCK_DEAD)) { - const int alive = ((icsk->icsk_rto << icsk->icsk_backoff) < TCP_RTO_MAX); - + const int alive = ((icsk->icsk_rto << icsk->icsk_backoff) < + (tp->rto_max ? : sysctl_tcp_rto_max)); max_probes = tcp_orphan_retries(sk, alive); if (tcp_out_of_resources(sk, alive || icsk->icsk_probes_out <= max_probes)) @@ -301,7 +304,8 @@ inet->num, tp->snd_una, tp->snd_nxt); } #endif - if (tcp_time_stamp - tp->rcv_tstamp > TCP_RTO_MAX) { + if (tcp_time_stamp - tp->rcv_tstamp > + (tp->rto_max ? : sysctl_tcp_rto_max)) { tcp_write_err(sk); goto out; } @@ -373,7 +377,8 @@ out_reset_timer: icsk->icsk_rto = min(icsk->icsk_rto << 1, TCP_RTO_MAX); - inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, icsk->icsk_rto, TCP_RTO_MAX); + inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, icsk->icsk_rto, + (tp->rto_max ? : sysctl_tcp_rto_max)); if (icsk->icsk_retransmits > sysctl_tcp_retries1) __sk_dst_reset(sk); @@ -428,7 +433,8 @@ static void tcp_synack_timer(struct sock *sk) { inet_csk_reqsk_queue_prune(sk, TCP_SYNQ_INTERVAL, - TCP_TIMEOUT_INIT, TCP_RTO_MAX); + TCP_TIMEOUT_INIT, + ((tp->rto_init ? : sysctl_tcp_rto_init))); } void tcp_set_keepalive(struct sock *sk, int val)