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| <a href="#404" id="404">404</a> |
| <a href="#405" id="405">405</a> |
| <a href="#406" id="406">406</a> |
| <a href="#407" id="407">407</a> |
| <a href="#408" id="408">408</a> |
| <a href="#409" id="409">409</a> |
| <a href="#410" id="410">410</a> |
| <a href="#411" id="411">411</a> |
| <a href="#412" id="412">412</a> |
| <a href="#413" id="413">413</a> |
| <a href="#414" id="414">414</a> |
| <a href="#415" id="415">415</a> |
| <a href="#416" id="416">416</a> |
| <a href="#417" id="417">417</a> |
| <a href="#418" id="418">418</a> |
| <a href="#419" id="419">419</a> |
| <a href="#420" id="420">420</a> |
| <a href="#421" id="421">421</a> |
| <a href="#422" id="422">422</a> |
| </pre></div><pre class="rust"><code><span class="comment">// Copyright (C) 2019, Cloudflare, Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright notice, |
| // this list of conditions and the following disclaimer. |
| // |
| // * Redistributions in binary form must reproduce the above copyright |
| // notice, this list of conditions and the following disclaimer in the |
| // documentation and/or other materials provided with the distribution. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| // IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| // THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR |
| // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| </span><span class="doccomment">//! Reno Congestion Control |
| //! |
| //! Note that Slow Start can use HyStart++ when enabled. |
| |
| </span><span class="kw">use </span>std::cmp; |
| <span class="kw">use </span>std::time::Instant; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::recovery; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::recovery::Acked; |
| <span class="kw">use </span><span class="kw">crate</span>::recovery::CongestionControlOps; |
| <span class="kw">use </span><span class="kw">crate</span>::recovery::Recovery; |
| <span class="kw">use </span><span class="kw">crate</span>::recovery::Sent; |
| |
| <span class="kw">pub static </span>RENO: CongestionControlOps = CongestionControlOps { |
| on_init, |
| reset, |
| on_packet_sent, |
| on_packets_acked, |
| congestion_event, |
| collapse_cwnd, |
| checkpoint, |
| rollback, |
| has_custom_pacing, |
| debug_fmt, |
| }; |
| |
| <span class="kw">pub fn </span>on_init(_r: <span class="kw-2">&mut </span>Recovery) {} |
| |
| <span class="kw">pub fn </span>reset(_r: <span class="kw-2">&mut </span>Recovery) {} |
| |
| <span class="kw">pub fn </span>on_packet_sent(_r: <span class="kw-2">&mut </span>Recovery, _sent_bytes: usize, _now: Instant) {} |
| |
| <span class="kw">fn </span>on_packets_acked(r: <span class="kw-2">&mut </span>Recovery, packets: <span class="kw-2">&mut </span>Vec<Acked>, now: Instant) { |
| <span class="kw">for </span>pkt <span class="kw">in </span>packets.drain(..) { |
| on_packet_acked(r, <span class="kw-2">&</span>pkt, now); |
| } |
| } |
| |
| <span class="kw">fn </span>on_packet_acked(r: <span class="kw-2">&mut </span>Recovery, packet: <span class="kw-2">&</span>Acked, now: Instant) { |
| <span class="kw">if </span>r.in_congestion_recovery(packet.time_sent) { |
| <span class="kw">return</span>; |
| } |
| |
| <span class="kw">if </span>r.app_limited { |
| <span class="kw">return</span>; |
| } |
| |
| <span class="kw">if </span>r.congestion_window < r.ssthresh { |
| <span class="comment">// In Slow slart, bytes_acked_sl is used for counting |
| // acknowledged bytes. |
| </span>r.bytes_acked_sl += packet.size; |
| |
| <span class="kw">if </span>r.hystart.in_css() { |
| r.congestion_window += r.hystart.css_cwnd_inc(r.max_datagram_size); |
| } <span class="kw">else </span>{ |
| r.congestion_window += r.max_datagram_size; |
| } |
| |
| <span class="kw">if </span>r.hystart |
| .on_packet_acked(packet, r.rtt_stats.latest_rtt, now) |
| { |
| <span class="comment">// Exit to congestion avoidance if CSS ends. |
| </span>r.ssthresh = r.congestion_window; |
| } |
| } <span class="kw">else </span>{ |
| <span class="comment">// Congestion avoidance. |
| </span>r.bytes_acked_ca += packet.size; |
| |
| <span class="kw">if </span>r.bytes_acked_ca >= r.congestion_window { |
| r.bytes_acked_ca -= r.congestion_window; |
| r.congestion_window += r.max_datagram_size; |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>congestion_event( |
| r: <span class="kw-2">&mut </span>Recovery, _lost_bytes: usize, largest_lost_pkt: <span class="kw-2">&</span>Sent, now: Instant, |
| ) { |
| <span class="comment">// Start a new congestion event if packet was sent after the |
| // start of the previous congestion recovery period. |
| </span><span class="kw">let </span>time_sent = largest_lost_pkt.time_sent; |
| |
| <span class="kw">if </span>!r.in_congestion_recovery(time_sent) { |
| r.congestion_recovery_start_time = <span class="prelude-val">Some</span>(now); |
| |
| r.congestion_window = (r.congestion_window <span class="kw">as </span>f64 * |
| recovery::LOSS_REDUCTION_FACTOR) |
| <span class="kw">as </span>usize; |
| |
| r.congestion_window = cmp::max( |
| r.congestion_window, |
| r.max_datagram_size * recovery::MINIMUM_WINDOW_PACKETS, |
| ); |
| |
| r.bytes_acked_ca = (r.congestion_window <span class="kw">as </span>f64 * |
| recovery::LOSS_REDUCTION_FACTOR) <span class="kw">as </span>usize; |
| |
| r.ssthresh = r.congestion_window; |
| |
| <span class="kw">if </span>r.hystart.in_css() { |
| r.hystart.congestion_event(); |
| } |
| } |
| } |
| |
| <span class="kw">pub fn </span>collapse_cwnd(r: <span class="kw-2">&mut </span>Recovery) { |
| r.congestion_window = r.max_datagram_size * recovery::MINIMUM_WINDOW_PACKETS; |
| r.bytes_acked_sl = <span class="number">0</span>; |
| r.bytes_acked_ca = <span class="number">0</span>; |
| |
| <span class="kw">if </span>r.hystart.enabled() { |
| r.hystart.reset(); |
| } |
| } |
| |
| <span class="kw">fn </span>checkpoint(_r: <span class="kw-2">&mut </span>Recovery) {} |
| |
| <span class="kw">fn </span>rollback(_r: <span class="kw-2">&mut </span>Recovery) -> bool { |
| <span class="bool-val">true |
| </span>} |
| |
| <span class="kw">fn </span>has_custom_pacing() -> bool { |
| <span class="bool-val">false |
| </span>} |
| |
| <span class="kw">fn </span>debug_fmt(_r: <span class="kw-2">&</span>Recovery, _f: <span class="kw-2">&mut </span>std::fmt::Formatter) -> std::fmt::Result { |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="attr">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="kw">use </span>smallvec::smallvec; |
| <span class="kw">use </span>std::time::Duration; |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>reno_init() { |
| <span class="kw">let </span><span class="kw-2">mut </span>cfg = <span class="kw">crate</span>::Config::new(<span class="kw">crate</span>::PROTOCOL_VERSION).unwrap(); |
| cfg.set_cc_algorithm(recovery::CongestionControlAlgorithm::Reno); |
| |
| <span class="kw">let </span>r = Recovery::new(<span class="kw-2">&</span>cfg); |
| |
| <span class="macro">assert!</span>(r.cwnd() > <span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(r.bytes_in_flight, <span class="number">0</span>); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>reno_send() { |
| <span class="kw">let </span><span class="kw-2">mut </span>cfg = <span class="kw">crate</span>::Config::new(<span class="kw">crate</span>::PROTOCOL_VERSION).unwrap(); |
| cfg.set_cc_algorithm(recovery::CongestionControlAlgorithm::Reno); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>r = Recovery::new(<span class="kw-2">&</span>cfg); |
| |
| <span class="kw">let </span>now = Instant::now(); |
| |
| r.on_packet_sent_cc(<span class="number">0</span>, <span class="number">1000</span>, now); |
| |
| <span class="macro">assert_eq!</span>(r.bytes_in_flight, <span class="number">1000</span>); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>reno_slow_start() { |
| <span class="kw">let </span><span class="kw-2">mut </span>cfg = <span class="kw">crate</span>::Config::new(<span class="kw">crate</span>::PROTOCOL_VERSION).unwrap(); |
| cfg.set_cc_algorithm(recovery::CongestionControlAlgorithm::Reno); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>r = Recovery::new(<span class="kw-2">&</span>cfg); |
| |
| <span class="kw">let </span>now = Instant::now(); |
| |
| <span class="kw">let </span>p = recovery::Sent { |
| pkt_num: <span class="number">0</span>, |
| frames: <span class="macro">smallvec!</span>[], |
| time_sent: now, |
| time_acked: <span class="prelude-val">None</span>, |
| time_lost: <span class="prelude-val">None</span>, |
| size: r.max_datagram_size, |
| ack_eliciting: <span class="bool-val">true</span>, |
| in_flight: <span class="bool-val">true</span>, |
| delivered: <span class="number">0</span>, |
| delivered_time: std::time::Instant::now(), |
| first_sent_time: std::time::Instant::now(), |
| is_app_limited: <span class="bool-val">false</span>, |
| tx_in_flight: <span class="number">0</span>, |
| lost: <span class="number">0</span>, |
| has_data: <span class="bool-val">false</span>, |
| pmtud: <span class="bool-val">false</span>, |
| }; |
| |
| <span class="comment">// Send initcwnd full MSS packets to become no longer app limited |
| </span><span class="kw">for </span>pn <span class="kw">in </span><span class="number">0</span>..r.initial_congestion_window_packets { |
| r.on_packet_sent_cc(pn <span class="kw">as _</span>, p.size, now); |
| } |
| |
| <span class="kw">let </span>cwnd_prev = r.cwnd(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>acked = <span class="macro">vec!</span>[Acked { |
| pkt_num: p.pkt_num, |
| time_sent: p.time_sent, |
| size: p.size, |
| delivered: <span class="number">0</span>, |
| delivered_time: now, |
| first_sent_time: now, |
| is_app_limited: <span class="bool-val">false</span>, |
| tx_in_flight: <span class="number">0</span>, |
| lost: <span class="number">0</span>, |
| rtt: Duration::ZERO, |
| }]; |
| |
| r.on_packets_acked(<span class="kw-2">&mut </span>acked, now); |
| |
| <span class="comment">// Check if cwnd increased by packet size (slow start). |
| </span><span class="macro">assert_eq!</span>(r.cwnd(), cwnd_prev + p.size); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>reno_slow_start_multi_acks() { |
| <span class="kw">let </span><span class="kw-2">mut </span>cfg = <span class="kw">crate</span>::Config::new(<span class="kw">crate</span>::PROTOCOL_VERSION).unwrap(); |
| cfg.set_cc_algorithm(recovery::CongestionControlAlgorithm::Reno); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>r = Recovery::new(<span class="kw-2">&</span>cfg); |
| |
| <span class="kw">let </span>now = Instant::now(); |
| |
| <span class="kw">let </span>p = recovery::Sent { |
| pkt_num: <span class="number">0</span>, |
| frames: <span class="macro">smallvec!</span>[], |
| time_sent: now, |
| time_acked: <span class="prelude-val">None</span>, |
| time_lost: <span class="prelude-val">None</span>, |
| size: r.max_datagram_size, |
| ack_eliciting: <span class="bool-val">true</span>, |
| in_flight: <span class="bool-val">true</span>, |
| delivered: <span class="number">0</span>, |
| delivered_time: std::time::Instant::now(), |
| first_sent_time: std::time::Instant::now(), |
| is_app_limited: <span class="bool-val">false</span>, |
| tx_in_flight: <span class="number">0</span>, |
| lost: <span class="number">0</span>, |
| has_data: <span class="bool-val">false</span>, |
| pmtud: <span class="bool-val">false</span>, |
| }; |
| |
| <span class="comment">// Send initcwnd full MSS packets to become no longer app limited |
| </span><span class="kw">for </span>pn <span class="kw">in </span><span class="number">0</span>..r.initial_congestion_window_packets { |
| r.on_packet_sent_cc(pn <span class="kw">as _</span>, p.size, now); |
| } |
| |
| <span class="kw">let </span>cwnd_prev = r.cwnd(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>acked = <span class="macro">vec!</span>[ |
| Acked { |
| pkt_num: p.pkt_num, |
| time_sent: p.time_sent, |
| size: p.size, |
| delivered: <span class="number">0</span>, |
| delivered_time: now, |
| first_sent_time: now, |
| is_app_limited: <span class="bool-val">false</span>, |
| tx_in_flight: <span class="number">0</span>, |
| lost: <span class="number">0</span>, |
| rtt: Duration::ZERO, |
| }, |
| Acked { |
| pkt_num: p.pkt_num, |
| time_sent: p.time_sent, |
| size: p.size, |
| delivered: <span class="number">0</span>, |
| delivered_time: now, |
| first_sent_time: now, |
| is_app_limited: <span class="bool-val">false</span>, |
| tx_in_flight: <span class="number">0</span>, |
| lost: <span class="number">0</span>, |
| rtt: Duration::ZERO, |
| }, |
| Acked { |
| pkt_num: p.pkt_num, |
| time_sent: p.time_sent, |
| size: p.size, |
| delivered: <span class="number">0</span>, |
| delivered_time: now, |
| first_sent_time: now, |
| is_app_limited: <span class="bool-val">false</span>, |
| tx_in_flight: <span class="number">0</span>, |
| lost: <span class="number">0</span>, |
| rtt: Duration::ZERO, |
| }, |
| ]; |
| |
| r.on_packets_acked(<span class="kw-2">&mut </span>acked, now); |
| |
| <span class="comment">// Acked 3 packets. |
| </span><span class="macro">assert_eq!</span>(r.cwnd(), cwnd_prev + p.size * <span class="number">3</span>); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>reno_congestion_event() { |
| <span class="kw">let </span><span class="kw-2">mut </span>cfg = <span class="kw">crate</span>::Config::new(<span class="kw">crate</span>::PROTOCOL_VERSION).unwrap(); |
| cfg.set_cc_algorithm(recovery::CongestionControlAlgorithm::Reno); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>r = Recovery::new(<span class="kw-2">&</span>cfg); |
| |
| <span class="kw">let </span>prev_cwnd = r.cwnd(); |
| |
| <span class="kw">let </span>now = Instant::now(); |
| |
| <span class="kw">let </span>p = recovery::Sent { |
| pkt_num: <span class="number">0</span>, |
| frames: <span class="macro">smallvec!</span>[], |
| time_sent: now, |
| time_acked: <span class="prelude-val">None</span>, |
| time_lost: <span class="prelude-val">None</span>, |
| size: r.max_datagram_size, |
| ack_eliciting: <span class="bool-val">true</span>, |
| in_flight: <span class="bool-val">true</span>, |
| delivered: <span class="number">0</span>, |
| delivered_time: std::time::Instant::now(), |
| first_sent_time: std::time::Instant::now(), |
| is_app_limited: <span class="bool-val">false</span>, |
| has_data: <span class="bool-val">false</span>, |
| tx_in_flight: <span class="number">0</span>, |
| lost: <span class="number">0</span>, |
| pmtud: <span class="bool-val">false</span>, |
| }; |
| |
| r.congestion_event(r.max_datagram_size, <span class="kw-2">&</span>p, now); |
| |
| <span class="comment">// In Reno, after congestion event, cwnd will be cut in half. |
| </span><span class="macro">assert_eq!</span>(prev_cwnd / <span class="number">2</span>, r.cwnd()); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>reno_congestion_avoidance() { |
| <span class="kw">let </span><span class="kw-2">mut </span>cfg = <span class="kw">crate</span>::Config::new(<span class="kw">crate</span>::PROTOCOL_VERSION).unwrap(); |
| cfg.set_cc_algorithm(recovery::CongestionControlAlgorithm::Reno); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>r = Recovery::new(<span class="kw-2">&</span>cfg); |
| <span class="kw">let </span>now = Instant::now(); |
| <span class="kw">let </span>prev_cwnd = r.cwnd(); |
| |
| <span class="comment">// Fill up bytes_in_flight to avoid app_limited=true |
| </span>r.on_packet_sent_cc(<span class="number">0</span>, <span class="number">20000</span>, now); |
| |
| <span class="kw">let </span>p = recovery::Sent { |
| pkt_num: <span class="number">0</span>, |
| frames: <span class="macro">smallvec!</span>[], |
| time_sent: now, |
| time_acked: <span class="prelude-val">None</span>, |
| time_lost: <span class="prelude-val">None</span>, |
| size: r.max_datagram_size, |
| ack_eliciting: <span class="bool-val">true</span>, |
| in_flight: <span class="bool-val">true</span>, |
| delivered: <span class="number">0</span>, |
| delivered_time: std::time::Instant::now(), |
| first_sent_time: std::time::Instant::now(), |
| is_app_limited: <span class="bool-val">false</span>, |
| has_data: <span class="bool-val">false</span>, |
| tx_in_flight: <span class="number">0</span>, |
| lost: <span class="number">0</span>, |
| pmtud: <span class="bool-val">false</span>, |
| }; |
| |
| <span class="comment">// Trigger congestion event to update ssthresh |
| </span>r.congestion_event(r.max_datagram_size, <span class="kw-2">&</span>p, now); |
| |
| <span class="comment">// After congestion event, cwnd will be reduced. |
| </span><span class="kw">let </span>cur_cwnd = |
| (prev_cwnd <span class="kw">as </span>f64 * recovery::LOSS_REDUCTION_FACTOR) <span class="kw">as </span>usize; |
| <span class="macro">assert_eq!</span>(r.cwnd(), cur_cwnd); |
| |
| <span class="kw">let </span>rtt = Duration::from_millis(<span class="number">100</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>acked = <span class="macro">vec!</span>[Acked { |
| pkt_num: <span class="number">0</span>, |
| <span class="comment">// To exit from recovery |
| </span>time_sent: now + rtt, |
| <span class="comment">// More than cur_cwnd to increase cwnd |
| </span>size: <span class="number">8000</span>, |
| delivered: <span class="number">0</span>, |
| delivered_time: now, |
| first_sent_time: now, |
| is_app_limited: <span class="bool-val">false</span>, |
| tx_in_flight: <span class="number">0</span>, |
| lost: <span class="number">0</span>, |
| rtt: Duration::ZERO, |
| }]; |
| |
| <span class="comment">// Ack more than cwnd bytes with rtt=100ms |
| </span>r.rtt_stats.update_rtt(rtt, Duration::from_millis(<span class="number">0</span>), now); |
| r.on_packets_acked(<span class="kw-2">&mut </span>acked, now + rtt * <span class="number">2</span>); |
| |
| <span class="comment">// After acking more than cwnd, expect cwnd increased by MSS |
| </span><span class="macro">assert_eq!</span>(r.cwnd(), cur_cwnd + r.max_datagram_size); |
| } |
| } |
| </code></pre></div></section></main></body></html> |
