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Add a sysctl to toggle the use of the sockets LOWAT when calculating auto window growth

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Submitted by:	j@nitrology.com (Jason Wolfe)
Reviewed by:	gnn hiren
Sponsored by:	Limelight Networks
Differential Revision:	https://reviews.freebsd.org/D11016
This commit is contained in:
Sean Bruno 2017-07-03 19:39:58 +00:00
parent 6ef9566177
commit ac952dd274
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=320614
1 changed files with 12 additions and 2 deletions
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14
sys/netinet/tcp_output.c
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@ -130,6 +130,12 @@ SYSCTL_INT(_net_inet_tcp, OID_AUTO, sendbuf_max, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(tcp_autosndbuf_max), 0,
"Max size of automatic send buffer");
VNET_DEFINE(int, tcp_sendbuf_auto_lowat) = 0;
#define V_tcp_sendbuf_auto_lowat VNET(tcp_sendbuf_auto_lowat)
SYSCTL_INT(_net_inet_tcp, OID_AUTO, sendbuf_auto_lowat, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(tcp_sendbuf_auto_lowat), 0,
"Modify threshold for auto send buffer growth to account for SO_SNDLOWAT");
/*
* Make sure that either retransmit or persist timer is set for SYN, FIN and
* non-ACK.
@ -521,8 +527,12 @@ tcp_output(struct tcpcb *tp)
* XXXGL: should there be used sbused() or sbavail()?
*/
if (V_tcp_do_autosndbuf && so->so_snd.sb_flags & SB_AUTOSIZE) {
if ((tp->snd_wnd / 4 * 5) >= so->so_snd.sb_hiwat &&
sbused(&so->so_snd) >= (so->so_snd.sb_hiwat / 8 * 7) &&
int autosndbuf_mod = 0;
if (V_tcp_sendbuf_auto_lowat)
autosndbuf_mod = so->so_snd.sb_lowat;
if ((tp->snd_wnd / 4 * 5) >= so->so_snd.sb_hiwat - autosndbuf_mod &&
sbused(&so->so_snd) >= (so->so_snd.sb_hiwat / 8 * 7) - autosndbuf_mod &&
sbused(&so->so_snd) < V_tcp_autosndbuf_max &&
sendwin >= (sbused(&so->so_snd) -
(tp->snd_nxt - tp->snd_una))) {