Differential D5173 Diff 13194 sys/netinet/cc/cc_newreno.c

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sys/netinet/cc/cc_newreno.c

Show First 20 Lines • Show All 145 Lines • ▼ Show 20 Lines	if (incr > 0)
CCV(ccv, snd_cwnd) = min(cw + incr,		CCV(ccv, snd_cwnd) = min(cw + incr,
TCP_MAXWIN << CCV(ccv, snd_scale));		TCP_MAXWIN << CCV(ccv, snd_scale));
}		}
}		}

static void		static void
newreno_after_idle(struct cc_var *ccv)		newreno_after_idle(struct cc_var *ccv)
{		{
int rw;		u_long rw;

/*		/*
* If we've been idle for more than one retransmit timeout the old		* If we've been idle for more than one retransmit timeout the old
* congestion window is no longer current and we have to reduce it to		* congestion window is no longer current and we have to reduce it to
* the restart window before we can transmit again.		* the restart window before we can transmit again.
*		*
* The restart window is the initial window or the last CWND, whichever		* The restart window is the initial window or the last CWND, whichever
* is smaller.		* is smaller.
*		*
* This is done to prevent us from flooding the path with a full CWND at		* This is done to prevent us from flooding the path with a full CWND at
* wirespeed, overloading router and switch buffers along the way.		* wirespeed, overloading router and switch buffers along the way.
*		*
* See RFC5681 Section 4.1. "Restarting Idle Connections".		* See RFC5681 Section 4.1. "Restarting Idle Connections".
*/		*/
if (V_tcp_do_rfc3390)		rw = tcp_initcwnd(ccv->ccvc.tcp, CCV(ccv, t_maxseg));
rw = min(4 * CCV(ccv, t_maxseg),
max(2 * CCV(ccv, t_maxseg), 4380));
else
rw = CCV(ccv, t_maxseg) * 2;

CCV(ccv, snd_cwnd) = min(rw, CCV(ccv, snd_cwnd));		CCV(ccv, snd_cwnd) = min(rw, CCV(ccv, snd_cwnd));
}		}

/*		/*
* Perform any necessary tasks before we enter congestion recovery.		* Perform any necessary tasks before we enter congestion recovery.
*/		*/
static void		static void
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