Add a sysctl to toggle the use of the sockets LOWAT when calculating auto window growth
Submitted by: j@nitrology.com (Jason Wolfe) Reviewed by: gnn hiren Sponsored by: Limelight Networks Differential Revision: https://reviews.freebsd.org/D11016
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6ef9566177
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ac952dd274
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=320614
@ -130,6 +130,12 @@ SYSCTL_INT(_net_inet_tcp, OID_AUTO, sendbuf_max, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(tcp_autosndbuf_max), 0,
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"Max size of automatic send buffer");
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VNET_DEFINE(int, tcp_sendbuf_auto_lowat) = 0;
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#define V_tcp_sendbuf_auto_lowat VNET(tcp_sendbuf_auto_lowat)
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SYSCTL_INT(_net_inet_tcp, OID_AUTO, sendbuf_auto_lowat, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(tcp_sendbuf_auto_lowat), 0,
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"Modify threshold for auto send buffer growth to account for SO_SNDLOWAT");
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/*
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* Make sure that either retransmit or persist timer is set for SYN, FIN and
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* non-ACK.
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@ -521,8 +527,12 @@ tcp_output(struct tcpcb *tp)
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* XXXGL: should there be used sbused() or sbavail()?
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*/
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if (V_tcp_do_autosndbuf && so->so_snd.sb_flags & SB_AUTOSIZE) {
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if ((tp->snd_wnd / 4 * 5) >= so->so_snd.sb_hiwat &&
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sbused(&so->so_snd) >= (so->so_snd.sb_hiwat / 8 * 7) &&
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int autosndbuf_mod = 0;
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if (V_tcp_sendbuf_auto_lowat)
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autosndbuf_mod = so->so_snd.sb_lowat;
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if ((tp->snd_wnd / 4 * 5) >= so->so_snd.sb_hiwat - autosndbuf_mod &&
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sbused(&so->so_snd) >= (so->so_snd.sb_hiwat / 8 * 7) - autosndbuf_mod &&
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sbused(&so->so_snd) < V_tcp_autosndbuf_max &&
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sendwin >= (sbused(&so->so_snd) -
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(tp->snd_nxt - tp->snd_una))) {
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