Differential D3858 Diff 9669 sys/netinet/tcp_input.c

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sys/netinet/tcp_input.c

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VNET_DEFINE(int, tcp_do_rfc3390) = 1;		VNET_DEFINE(int, tcp_do_rfc3390) = 1;
SYSCTL_INT(_net_inet_tcp, OID_AUTO, rfc3390, CTLFLAG_VNET \| CTLFLAG_RW,		SYSCTL_INT(_net_inet_tcp, OID_AUTO, rfc3390, CTLFLAG_VNET \| CTLFLAG_RW,
&VNET_NAME(tcp_do_rfc3390), 0,		&VNET_NAME(tcp_do_rfc3390), 0,
"Enable RFC 3390 (Increasing TCP's Initial Congestion Window)");		"Enable RFC 3390 (Increasing TCP's Initial Congestion Window)");

SYSCTL_NODE(_net_inet_tcp, OID_AUTO, experimental, CTLFLAG_RW, 0,		SYSCTL_NODE(_net_inet_tcp, OID_AUTO, experimental, CTLFLAG_RW, 0,
"Experimental TCP extensions");		"Experimental TCP extensions");

VNET_DEFINE(int, tcp_do_initcwnd10) = 1;		VNET_DEFINE(int, tcp_initcwnd_in_mss) = 10;
SYSCTL_INT(_net_inet_tcp_experimental, OID_AUTO, initcwnd10, CTLFLAG_VNET \| CTLFLAG_RW,		SYSCTL_INT(_net_inet_tcp, OID_AUTO, initcwnd_in_mss, CTLFLAG_VNET \| CTLFLAG_RW,
&VNET_NAME(tcp_do_initcwnd10), 0,		&VNET_NAME(tcp_initcwnd_in_mss), 0,
"Enable RFC 6928 (Increasing initial CWND to 10)");		"Slow-start flight size (initial congestion window) in number of segments");

VNET_DEFINE(int, tcp_do_rfc3465) = 1;		VNET_DEFINE(int, tcp_do_rfc3465) = 1;
SYSCTL_INT(_net_inet_tcp, OID_AUTO, rfc3465, CTLFLAG_VNET \| CTLFLAG_RW,		SYSCTL_INT(_net_inet_tcp, OID_AUTO, rfc3465, CTLFLAG_VNET \| CTLFLAG_RW,
&VNET_NAME(tcp_do_rfc3465), 0,		&VNET_NAME(tcp_do_rfc3465), 0,
"Enable RFC 3465 (Appropriate Byte Counting)");		"Enable RFC 3465 (Appropriate Byte Counting)");

VNET_DEFINE(int, tcp_abc_l_var) = 2;		VNET_DEFINE(int, tcp_abc_l_var) = 2;
SYSCTL_INT(_net_inet_tcp, OID_AUTO, abc_l_var, CTLFLAG_VNET \| CTLFLAG_RW,		SYSCTL_INT(_net_inet_tcp, OID_AUTO, abc_l_var, CTLFLAG_VNET \| CTLFLAG_RW,
▲ Show 20 Lines • Show All 182 Lines • ▼ Show 20 Lines	cc_conn_init(struct tcpcb *tp)
}		}

/*		/*
* Set the initial slow-start flight size.		* Set the initial slow-start flight size.
*		*
* RFC5681 Section 3.1 specifies the default conservative values.		* RFC5681 Section 3.1 specifies the default conservative values.
* RFC3390 specifies slightly more aggressive values.		* RFC3390 specifies slightly more aggressive values.
* RFC6928 increases it to ten segments.		* RFC6928 increases it to ten segments.
		* Support for user specified value for initial flight size.
*		*
* If a SYN or SYN/ACK was lost and retransmitted, we have to		* If a SYN or SYN/ACK was lost and retransmitted, we have to
* reduce the initial CWND to one segment as congestion is likely		* reduce the initial CWND to one segment as congestion is likely
* requiring us to be cautious.		* requiring us to be cautious.
*/		*/
if (tp->snd_cwnd == 1)		if (tp->snd_cwnd == 1)
tp->snd_cwnd = tp->t_maxseg; /* SYN(-ACK) lost */		tp->snd_cwnd = tp->t_maxseg; /* SYN(-ACK) lost */
else if (V_tcp_do_initcwnd10)		else if (V_tcp_initcwnd_in_mss)
tp->snd_cwnd = min(10 * tp->t_maxseg,		tp->snd_cwnd = min(V_tcp_initcwnd_in_mss * tp->t_maxseg,
max(2 * tp->t_maxseg, 14600));		max(2 * tp->t_maxseg, V_tcp_initcwnd_in_mss * 1460));
else if (V_tcp_do_rfc3390)		else if (V_tcp_do_rfc3390)
tp->snd_cwnd = min(4 * tp->t_maxseg,		tp->snd_cwnd = min(4 * tp->t_maxseg,
max(2 * tp->t_maxseg, 4380));		max(2 * tp->t_maxseg, 4380));
else {		else {
/* Per RFC5681 Section 3.1 */		/* Per RFC5681 Section 3.1 */
if (tp->t_maxseg > 2190)		if (tp->t_maxseg > 2190)
tp->snd_cwnd = 2 * tp->t_maxseg;		tp->snd_cwnd = 2 * tp->t_maxseg;
else if (tp->t_maxseg > 1095)		else if (tp->t_maxseg > 1095)
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