4e4c84f8d1
TCP Hystart draft version -03: https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-hystartplusplus Is a new version of hystart that allows one to carefully exit slow start if the RTT spikes too much. The newer version has a slower-slow-start so to speak that then kicks in for five round trips. To see if you exited too early, if not into congestion avoidance. This commit will add that feature to our newreno CC and add the needed bits in rack to be able to enable it. Reviewed by: tuexen Sponsored by: Netflix Inc. Differential Revision: https://reviews.freebsd.org/D32373
66 lines
2.6 KiB
C
66 lines
2.6 KiB
C
/*-
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* Copyright (c) 2017 Tom Jones <tj@enoti.me>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _CC_NEWRENO_H
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#define _CC_NEWRENO_H
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#define CCALGONAME_NEWRENO "newreno"
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struct newreno {
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uint32_t beta;
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uint32_t beta_ecn;
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uint32_t newreno_flags;
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uint32_t css_baseline_minrtt;
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uint32_t css_current_round_minrtt;
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uint32_t css_lastround_minrtt;
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uint32_t css_rttsample_count;
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uint32_t css_entered_at_round;
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uint32_t css_current_round;
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uint32_t css_fas_at_css_entry;
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uint32_t css_lowrtt_fas;
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uint32_t css_last_fas;
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};
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struct cc_newreno_opts {
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int name;
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uint32_t val;
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};
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#define CC_NEWRENO_BETA 1 /* Beta for normal DUP-ACK/Sack recovery */
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#define CC_NEWRENO_BETA_ECN 2 /* ECN Beta for Abe */
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#define CC_NEWRENO_ENABLE_HYSTART 3 /* Enable hystart */
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/* Flags values */
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#define CC_NEWRENO_HYSTART_ALLOWED 0x0001 /* Does the tcp connection allow hystart? */
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#define CC_NEWRENO_HYSTART_ENABLED 0x0002 /* We can do hystart, a loss removes this flag */
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#define CC_NEWRENO_HYSTART_IN_CSS 0x0004 /* If we enter hystart CSS this flag is set */
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#define CC_NEWRENO_HYSTART_CAN_SH_CWND 0x0008 /* Can hystart when going CSS -> CA slam the cwnd */
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#define CC_NEWRENO_HYSTART_CONS_SSTH 0x0010 /* Should hystart use the more conservative sstrhesh */
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#define CC_NEWRENO_BETA_ECN_ENABLED 0x0020
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#endif /* _CC_NEWRENO_H */
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