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As suggested by Sally Floyd, don't add the ``small fraction of the window

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size'' when doing congestion avoidance.

Submitted by:	Mark Andrews
This commit is contained in:
Garrett Wollman 1994-10-13 18:36:32 +00:00
parent 1dc73d350b
commit 10be56487a
2 changed files with 6 additions and 10 deletions
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8
sys/netinet/tcp_input.c
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)tcp_input.c 8.5 (Berkeley) 4/10/94
* $Id: tcp_input.c,v 1.8 1994/09/15 10:36:54 davidg Exp $
* $Id: tcp_input.c,v 1.9 1994/10/02 17:48:43 phk Exp $
*/
#ifndef TUBA_INCLUDE
@ -1033,16 +1033,14 @@ tcp_input(m, iphlen)
* If the window gives us less than ssthresh packets
* in flight, open exponentially (maxseg per packet).
* Otherwise open linearly: maxseg per window
* (maxseg^2 / cwnd per packet), plus a constant
* fraction of a packet (maxseg/8) to help larger windows
* open quickly enough.
* (maxseg^2 / cwnd per packet).
*/
{
register u_int cw = tp->snd_cwnd;
register u_int incr = tp->t_maxseg;
if (cw > tp->snd_ssthresh)
incr = incr * incr / cw + incr / 8;
incr = incr * incr / cw;
tp->snd_cwnd = min(cw + incr, TCP_MAXWIN<<tp->snd_scale);
}
if (acked > so->so_snd.sb_cc) {

8
sys/netinet/tcp_reass.c
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)tcp_input.c 8.5 (Berkeley) 4/10/94
* $Id: tcp_input.c,v 1.8 1994/09/15 10:36:54 davidg Exp $
* $Id: tcp_input.c,v 1.9 1994/10/02 17:48:43 phk Exp $
*/
#ifndef TUBA_INCLUDE
@ -1033,16 +1033,14 @@ tcp_input(m, iphlen)
* If the window gives us less than ssthresh packets
* in flight, open exponentially (maxseg per packet).
* Otherwise open linearly: maxseg per window
* (maxseg^2 / cwnd per packet), plus a constant
* fraction of a packet (maxseg/8) to help larger windows
* open quickly enough.
* (maxseg^2 / cwnd per packet).
*/
{
register u_int cw = tp->snd_cwnd;
register u_int incr = tp->t_maxseg;
if (cw > tp->snd_ssthresh)
incr = incr * incr / cw + incr / 8;
incr = incr * incr / cw;
tp->snd_cwnd = min(cw + incr, TCP_MAXWIN<<tp->snd_scale);
}
if (acked > so->so_snd.sb_cc) {