Differential D33035 Diff 102444 share/man/man4/cc_newreno.4

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share/man/man4/cc_newreno.4

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	CC_NEWRENO_BETA) / 100.			CC_NEWRENO_BETA) / 100.
	Default is 50.			Default is 50.
	.It Va CC_NEWRENO_BETA_ECN			.It Va CC_NEWRENO_BETA_ECN
	Multiplicative window decrease factor, specified as a percentage, applied to			Multiplicative window decrease factor, specified as a percentage, applied to
	the congestion window in response to an ECN congestion signal when			the congestion window in response to an ECN congestion signal when
	.Va net.inet.tcp.cc.abe=1			.Va net.inet.tcp.cc.abe=1
	per: cwnd = (cwnd * CC_NEWRENO_BETA_ECN) / 100.			per: cwnd = (cwnd * CC_NEWRENO_BETA_ECN) / 100.
	Default is 80.			Default is 80.
	.It Va CC_NEWRENO_ENABLE_HYSTART
	will enable or disable the application of Hystart++.
	The current implementation allows the values 0, 1, 2 and 3.
	A value of 0 (the default) disables the use of Hystart++.
	Setting the value to 1 enables Hystart++.
	Setting the value to 2 enables Hystart++ but also will cause, on exit from Hystart++'s CSS, to
	set the cwnd to the value of where the increase in RTT first began as
	well as setting ssthresh to the flight at send when we exit CSS.
	Setting a value of 3 will keep the setting of the cwnd the same as 2, but will cause ssthresh
	to be set to the average value between the lowest fas rtt (the value cwnd is
	set to) and the fas value at exit of CSS.
	.PP			.PP
	Note that currently the only way to enable			Note that currently the only way to enable
	hystart++ is to enable it via socket option.			hystart++ is to enable it via socket option.
	When enabling it a value of 1 will enable precise internet-draft behavior			When enabling it a value of 1 will enable precise internet-draft (version 4) behavior
	(subject to any MIB variable settings), other setting (2 and 3) are experimental.			(subject to any MIB variable settings), other setting (2 and 3) are experimental.
	.El			.El
	.PP			.PP
	Note that hystart++ requires the TCP stack be able to call to the congestion			Note that hystart++ requires the TCP stack be able to call to the congestion
	controller with both the			controller with both the
	.Va newround			.Va newround
	function as well as the			function as well as the
	.Va rttsample			.Va rttsample
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	beta) / 100.			beta) / 100.
	Default is 50.			Default is 50.
	.It Va beta_ecn			.It Va beta_ecn
	Multiplicative window decrease factor, specified as a percentage, applied to			Multiplicative window decrease factor, specified as a percentage, applied to
	the congestion window in response to an ECN congestion signal when			the congestion window in response to an ECN congestion signal when
	.Va net.inet.tcp.cc.abe=1			.Va net.inet.tcp.cc.abe=1
	per: cwnd = (cwnd * beta_ecn) / 100.			per: cwnd = (cwnd * beta_ecn) / 100.
	Default is 80.			Default is 80.
	.It Va hystartplusplus.bblogs
	This boolean controls if black box logging will be done for hystart++ events. If set
	to zero (the default) no logging is performed.
	If set to one then black box logs will be generated on all hystart++ events.
	.It Va hystartplusplus.css_rounds
	This value controls the number of rounds that CSS runs for.
	The default value matches the current internet-draft of 5.
	.It Va hystartplusplus.css_growth_div
	This value controls the divisor applied to slowstart during CSS.
	The default value matches the current internet-draft of 4.
	.It Va hystartplusplus.n_rttsamples
	This value controls how many rtt samples must be collected in each round for
	hystart++ to be active.
	The default value matches the current internet-draft of 8.
	.It Va hystartplusplus.maxrtt_thresh
	This value controls the maximum rtt variance clamp when considering if CSS is needed.
	The default value matches the current internet-draft of 16000 (in microseconds).
	For further explanation please see the internet-draft.
	.It Va hystartplusplus.minrtt_thresh
	This value controls the minimum rtt variance clamp when considering if CSS is needed.
	The default value matches the current internet-draft of 4000 (in microseconds).
	For further explanation please see the internet-draft.
	.It Va hystartplusplus.lowcwnd
	This value controls what is the lowest congestion window that the tcp
	stack must be at before hystart++ engages.
	The default value matches the current internet-draft of 16.
	.El			.El
	.Sh SEE ALSO			.Sh SEE ALSO
	.Xr cc_cdg 4 ,			.Xr cc_cdg 4 ,
	.Xr cc_chd 4 ,			.Xr cc_chd 4 ,
	.Xr cc_cubic 4 ,			.Xr cc_cubic 4 ,
	.Xr cc_dctcp 4 ,			.Xr cc_dctcp 4 ,
	.Xr cc_hd 4 ,			.Xr cc_hd 4 ,
	.Xr cc_htcp 4 ,			.Xr cc_htcp 4 ,
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