e4ec942fc5
Rack includes the following features:
- A different SACK processing scheme (the old sack structures are not used).
- RACK (Recent acknowledgment) where counting dup-acks is no longer done
instead time is used to knwo when to retransmit. (see the I-D)
- TLP (Tail Loss Probe) where we will probe for tail-losses to attempt
to try not to take a retransmit time-out. (see the I-D)
- Burst mitigation using TCPHTPS
- PRR (partial rate reduction) see the RFC.
Once built into your kernel, you can select this stack by either
socket option with the name of the stack is "rack" or by setting
the global sysctl so the default is rack.
Note that any connection that does not support SACK will be kicked
back to the "default" base FreeBSD stack (currently known as "default").
To build this into your kernel you will need to enable in your
kernel:
makeoptions WITH_EXTRA_TCP_STACKS=1
options TCPHPTS
Sponsored by: Netflix Inc.
Differential Revision: https://reviews.freebsd.org/D15525
71 lines
2.8 KiB
C
71 lines
2.8 KiB
C
#ifndef __pacer_timer_h__
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#define __pacer_timer_h__
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/*-
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* Copyright (c) 2017
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* Netflix Inc.
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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 REGENTS 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 REGENTS 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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* __FBSDID("$FreeBSD$");
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*/
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/* Common defines and such used by both RACK and BBR */
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/* Special values for mss accounting array */
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#define TCP_MSS_ACCT_JUSTRET 0
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#define TCP_MSS_ACCT_SNDACK 1
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#define TCP_MSS_ACCT_PERSIST 2
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#define TCP_MSS_ACCT_ATIMER 60
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#define TCP_MSS_ACCT_INPACE 61
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#define TCP_MSS_ACCT_LATE 62
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#define TCP_MSS_SMALL_SIZE_OFF 63 /* Point where small sizes enter */
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#define TCP_MSS_ACCT_SIZE 70
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#define TCP_MSS_SMALL_MAX_SIZE_DIV (TCP_MSS_ACCT_SIZE - TCP_MSS_SMALL_SIZE_OFF)
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/* Magic flags to tell whats cooking on the pacing wheel */
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#define PACE_PKT_OUTPUT 0x01 /* Output Packets being paced */
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#define PACE_TMR_RACK 0x02 /* RACK timer running */
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#define PACE_TMR_TLP 0x04 /* TLP timer running */
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#define PACE_TMR_RXT 0x08 /* Retransmit timer running */
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#define PACE_TMR_PERSIT 0x10 /* Persists timer running */
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#define PACE_TMR_KEEP 0x20 /* Keep alive timer running */
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#define PACE_TMR_DELACK 0x40 /* Delayed ack timer running */
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#define PACE_TMR_MASK (PACE_TMR_KEEP|PACE_TMR_PERSIT|PACE_TMR_RXT|PACE_TMR_TLP|PACE_TMR_RACK|PACE_TMR_DELACK)
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/* Magic flags for tracing progress events */
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#define PROGRESS_DROP 1
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#define PROGRESS_UPDATE 2
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#define PROGRESS_CLEAR 3
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#define PROGRESS_START 4
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/* RTT sample methods */
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#define USE_RTT_HIGH 0
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#define USE_RTT_LOW 1
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#define USE_RTT_AVG 2
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#ifdef _KERNEL
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/* We have only 7 bits in rack so assert its true */
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CTASSERT((PACE_TMR_MASK & 0x80) == 0);
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#endif
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#endif
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