If the new window size is less than the old window size, skip the
calculations to check if we should advertise a larger window. Reviewed by: gnn MFC after: 2 weeks Sponsored by: Juniper Networks, Netflix Differential Revision: https://reviews.freebsd.org/D7076 Tested by: Limelight, Netflix
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=306768
@ -654,10 +654,11 @@ tcp_output(struct tcpcb *tp)
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oldwin = 0;
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/*
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* If the new window size ends up being the same as the old
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* size when it is scaled, then don't force a window update.
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* If the new window size ends up being the same as or less
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* than the old size when it is scaled, then don't force
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* a window update.
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*/
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if (oldwin >> tp->rcv_scale == (adv + oldwin) >> tp->rcv_scale)
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if (oldwin >> tp->rcv_scale >= (adv + oldwin) >> tp->rcv_scale)
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goto dontupdate;
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if (adv >= (long)(2 * tp->t_maxseg) &&
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