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| </pre></div><pre class="rust"><code><span class="comment">// Copyright (C) 2020-2022, 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">//! Delivery rate estimation. |
| //! |
| //! This implements the algorithm for estimating delivery rate as described in |
| //! <https://tools.ietf.org/html/draft-cheng-iccrg-delivery-rate-estimation-01> |
| |
| </span><span class="kw">use </span>std::time::Duration; |
| <span class="kw">use </span>std::time::Instant; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::recovery::Acked; |
| <span class="kw">use </span><span class="kw">crate</span>::recovery::Sent; |
| |
| <span class="attr">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>Rate { |
| delivered: usize, |
| |
| delivered_time: Instant, |
| |
| first_sent_time: Instant, |
| |
| <span class="comment">// Packet number of the last sent packet with app limited. |
| </span>end_of_app_limited: u64, |
| |
| <span class="comment">// Packet number of the last sent packet. |
| </span>last_sent_packet: u64, |
| |
| <span class="comment">// Packet number of the largest acked packet. |
| </span>largest_acked: u64, |
| |
| <span class="comment">// Sample of rate estimation. |
| </span>rate_sample: RateSample, |
| } |
| |
| <span class="kw">impl </span>Default <span class="kw">for </span>Rate { |
| <span class="kw">fn </span>default() -> <span class="self">Self </span>{ |
| <span class="kw">let </span>now = Instant::now(); |
| |
| Rate { |
| delivered: <span class="number">0</span>, |
| |
| delivered_time: now, |
| |
| first_sent_time: now, |
| |
| end_of_app_limited: <span class="number">0</span>, |
| |
| last_sent_packet: <span class="number">0</span>, |
| |
| largest_acked: <span class="number">0</span>, |
| |
| rate_sample: RateSample::default(), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Rate { |
| <span class="kw">pub fn </span>on_packet_sent( |
| <span class="kw-2">&mut </span><span class="self">self</span>, pkt: <span class="kw-2">&mut </span>Sent, bytes_in_flight: usize, bytes_lost: u64, |
| ) { |
| <span class="comment">// No packets in flight. |
| </span><span class="kw">if </span>bytes_in_flight == <span class="number">0 </span>{ |
| <span class="self">self</span>.first_sent_time = pkt.time_sent; |
| <span class="self">self</span>.delivered_time = pkt.time_sent; |
| } |
| |
| pkt.first_sent_time = <span class="self">self</span>.first_sent_time; |
| pkt.delivered_time = <span class="self">self</span>.delivered_time; |
| pkt.delivered = <span class="self">self</span>.delivered; |
| pkt.is_app_limited = <span class="self">self</span>.app_limited(); |
| pkt.tx_in_flight = bytes_in_flight; |
| pkt.lost = bytes_lost; |
| |
| <span class="self">self</span>.last_sent_packet = pkt.pkt_num; |
| } |
| |
| <span class="comment">// Update the delivery rate sample when a packet is acked. |
| </span><span class="kw">pub fn </span>update_rate_sample(<span class="kw-2">&mut </span><span class="self">self</span>, pkt: <span class="kw-2">&</span>Acked, now: Instant) { |
| <span class="self">self</span>.delivered += pkt.size; |
| <span class="self">self</span>.delivered_time = now; |
| |
| <span class="comment">// Update info using the newest packet. If rate_sample is not yet |
| // initialized, initialize with the first packet. |
| </span><span class="kw">if </span><span class="self">self</span>.rate_sample.prior_time.is_none() || |
| pkt.delivered > <span class="self">self</span>.rate_sample.prior_delivered |
| { |
| <span class="self">self</span>.rate_sample.prior_delivered = pkt.delivered; |
| <span class="self">self</span>.rate_sample.prior_time = <span class="prelude-val">Some</span>(pkt.delivered_time); |
| <span class="self">self</span>.rate_sample.is_app_limited = pkt.is_app_limited; |
| <span class="self">self</span>.rate_sample.send_elapsed = |
| pkt.time_sent.saturating_duration_since(pkt.first_sent_time); |
| <span class="self">self</span>.rate_sample.rtt = pkt.rtt; |
| <span class="self">self</span>.rate_sample.ack_elapsed = <span class="self">self |
| </span>.delivered_time |
| .saturating_duration_since(pkt.delivered_time); |
| |
| <span class="self">self</span>.first_sent_time = pkt.time_sent; |
| } |
| |
| <span class="self">self</span>.largest_acked = <span class="self">self</span>.largest_acked.max(pkt.pkt_num); |
| } |
| |
| <span class="kw">pub fn </span>generate_rate_sample(<span class="kw-2">&mut </span><span class="self">self</span>, min_rtt: Duration) { |
| <span class="comment">// End app-limited phase if bubble is ACKed and gone. |
| </span><span class="kw">if </span><span class="self">self</span>.app_limited() && <span class="self">self</span>.largest_acked > <span class="self">self</span>.end_of_app_limited { |
| <span class="self">self</span>.update_app_limited(<span class="bool-val">false</span>); |
| } |
| |
| <span class="kw">if </span><span class="self">self</span>.rate_sample.prior_time.is_some() { |
| <span class="kw">let </span>interval = <span class="self">self |
| </span>.rate_sample |
| .send_elapsed |
| .max(<span class="self">self</span>.rate_sample.ack_elapsed); |
| |
| <span class="self">self</span>.rate_sample.delivered = |
| <span class="self">self</span>.delivered - <span class="self">self</span>.rate_sample.prior_delivered; |
| <span class="self">self</span>.rate_sample.interval = interval; |
| |
| <span class="kw">if </span>interval < min_rtt { |
| <span class="self">self</span>.rate_sample.interval = Duration::ZERO; |
| |
| <span class="comment">// No reliable sample. |
| </span><span class="kw">return</span>; |
| } |
| |
| <span class="kw">if </span>!interval.is_zero() { |
| <span class="comment">// Fill in rate_sample with a rate sample. |
| </span><span class="self">self</span>.rate_sample.delivery_rate = |
| (<span class="self">self</span>.rate_sample.delivered <span class="kw">as </span>f64 / interval.as_secs_f64()) |
| <span class="kw">as </span>u64; |
| } |
| } |
| } |
| |
| <span class="kw">pub fn </span>update_app_limited(<span class="kw-2">&mut </span><span class="self">self</span>, v: bool) { |
| <span class="self">self</span>.end_of_app_limited = <span class="kw">if </span>v { <span class="self">self</span>.last_sent_packet.max(<span class="number">1</span>) } <span class="kw">else </span>{ <span class="number">0 </span>} |
| } |
| |
| <span class="kw">pub fn </span>app_limited(<span class="kw-2">&mut </span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.end_of_app_limited != <span class="number">0 |
| </span>} |
| |
| <span class="kw">pub fn </span>delivered(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.delivered |
| } |
| |
| <span class="kw">pub fn </span>sample_delivery_rate(<span class="kw-2">&</span><span class="self">self</span>) -> u64 { |
| <span class="self">self</span>.rate_sample.delivery_rate |
| } |
| |
| <span class="kw">pub fn </span>sample_rtt(<span class="kw-2">&</span><span class="self">self</span>) -> Duration { |
| <span class="self">self</span>.rate_sample.rtt |
| } |
| |
| <span class="kw">pub fn </span>sample_is_app_limited(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.rate_sample.is_app_limited |
| } |
| |
| <span class="kw">pub fn </span>sample_delivered(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.rate_sample.delivered |
| } |
| |
| <span class="kw">pub fn </span>sample_prior_delivered(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.rate_sample.prior_delivered |
| } |
| } |
| |
| <span class="attr">#[derive(Default, Debug)] |
| </span><span class="kw">struct </span>RateSample { |
| delivery_rate: u64, |
| |
| is_app_limited: bool, |
| |
| interval: Duration, |
| |
| delivered: usize, |
| |
| prior_delivered: usize, |
| |
| prior_time: <span class="prelude-ty">Option</span><Instant>, |
| |
| send_elapsed: Duration, |
| |
| ack_elapsed: Duration, |
| |
| rtt: Duration, |
| } |
| |
| <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><span class="kw">crate</span>::recovery::<span class="kw-2">*</span>; |
| |
| <span class="kw">use </span>smallvec::smallvec; |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>rate_check() { |
| <span class="kw">let </span>config = Config::new(<span class="number">0xbabababa</span>).unwrap(); |
| <span class="kw">let </span><span class="kw-2">mut </span>r = Recovery::new(<span class="kw-2">&</span>config); |
| |
| <span class="kw">let </span>now = Instant::now(); |
| <span class="kw">let </span>mss = r.max_datagram_size(); |
| |
| <span class="comment">// Send 2 packets. |
| </span><span class="kw">for </span>pn <span class="kw">in </span><span class="number">0</span>..<span class="number">2 </span>{ |
| <span class="kw">let </span>pkt = Sent { |
| pkt_num: pn, |
| 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: mss, |
| ack_eliciting: <span class="bool-val">true</span>, |
| in_flight: <span class="bool-val">true</span>, |
| delivered: <span class="number">0</span>, |
| delivered_time: now, |
| first_sent_time: 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.on_packet_sent( |
| pkt, |
| packet::Epoch::Application, |
| HandshakeStatus::default(), |
| now, |
| <span class="string">""</span>, |
| ); |
| } |
| |
| <span class="kw">let </span>rtt = Duration::from_millis(<span class="number">50</span>); |
| <span class="kw">let </span>now = now + rtt; |
| |
| <span class="comment">// Ack 2 packets. |
| </span><span class="kw">for </span>pn <span class="kw">in </span><span class="number">0</span>..<span class="number">2 </span>{ |
| <span class="kw">let </span>acked = Acked { |
| pkt_num: pn, |
| time_sent: now, |
| size: mss, |
| rtt, |
| delivered: <span class="number">0</span>, |
| delivered_time: now, |
| first_sent_time: now.checked_sub(rtt).unwrap(), |
| is_app_limited: <span class="bool-val">false</span>, |
| tx_in_flight: <span class="number">0</span>, |
| lost: <span class="number">0</span>, |
| }; |
| |
| r.delivery_rate.update_rate_sample(<span class="kw-2">&</span>acked, now); |
| } |
| |
| <span class="comment">// Update rate sample after 1 rtt. |
| </span>r.delivery_rate.generate_rate_sample(rtt); |
| |
| <span class="comment">// Bytes acked so far. |
| </span><span class="macro">assert_eq!</span>(r.delivery_rate.delivered(), <span class="number">2400</span>); |
| |
| <span class="comment">// Estimated delivery rate = (1200 x 2) / 0.05s = 48000. |
| </span><span class="macro">assert_eq!</span>(r.delivery_rate(), <span class="number">48000</span>); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>app_limited_cwnd_full() { |
| <span class="kw">let </span>config = Config::new(<span class="number">0xbabababa</span>).unwrap(); |
| <span class="kw">let </span><span class="kw-2">mut </span>r = Recovery::new(<span class="kw-2">&</span>config); |
| |
| <span class="kw">let </span>now = Instant::now(); |
| <span class="kw">let </span>mss = r.max_datagram_size(); |
| |
| <span class="comment">// Send 10 packets to fill cwnd. |
| </span><span class="kw">for </span>pn <span class="kw">in </span><span class="number">0</span>..<span class="number">10 </span>{ |
| <span class="kw">let </span>pkt = Sent { |
| pkt_num: pn, |
| 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: mss, |
| ack_eliciting: <span class="bool-val">true</span>, |
| in_flight: <span class="bool-val">true</span>, |
| delivered: <span class="number">0</span>, |
| delivered_time: now, |
| first_sent_time: 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.on_packet_sent( |
| pkt, |
| packet::Epoch::Application, |
| HandshakeStatus::default(), |
| now, |
| <span class="string">""</span>, |
| ); |
| } |
| |
| <span class="macro">assert!</span>(!r.app_limited()); |
| <span class="macro">assert!</span>(!r.delivery_rate.sample_is_app_limited()); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>app_limited_check() { |
| <span class="kw">let </span>config = Config::new(<span class="number">0xbabababa</span>).unwrap(); |
| <span class="kw">let </span><span class="kw-2">mut </span>r = Recovery::new(<span class="kw-2">&</span>config); |
| |
| <span class="kw">let </span>now = Instant::now(); |
| <span class="kw">let </span>mss = r.max_datagram_size(); |
| |
| <span class="comment">// Send 5 packets. |
| </span><span class="kw">for </span>pn <span class="kw">in </span><span class="number">0</span>..<span class="number">5 </span>{ |
| <span class="kw">let </span>pkt = Sent { |
| pkt_num: pn, |
| 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: mss, |
| ack_eliciting: <span class="bool-val">true</span>, |
| in_flight: <span class="bool-val">true</span>, |
| delivered: <span class="number">0</span>, |
| delivered_time: now, |
| first_sent_time: 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.on_packet_sent( |
| pkt, |
| packet::Epoch::Application, |
| HandshakeStatus::default(), |
| now, |
| <span class="string">""</span>, |
| ); |
| } |
| |
| <span class="kw">let </span>rtt = Duration::from_millis(<span class="number">50</span>); |
| <span class="kw">let </span>now = now + rtt; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>acked = ranges::RangeSet::default(); |
| acked.insert(<span class="number">0</span>..<span class="number">5</span>); |
| |
| <span class="macro">assert_eq!</span>( |
| r.on_ack_received( |
| <span class="kw-2">&</span>acked, |
| <span class="number">25</span>, |
| packet::Epoch::Application, |
| HandshakeStatus::default(), |
| now, |
| <span class="string">""</span>, |
| <span class="kw-2">&mut </span>Vec::new(), |
| ), |
| <span class="prelude-val">Ok</span>((<span class="number">0</span>, <span class="number">0</span>)), |
| ); |
| |
| <span class="macro">assert!</span>(r.app_limited()); |
| <span class="comment">// Rate sample is not app limited (all acked). |
| </span><span class="macro">assert!</span>(!r.delivery_rate.sample_is_app_limited()); |
| <span class="macro">assert_eq!</span>(r.delivery_rate.sample_rtt(), rtt); |
| } |
| } |
| </code></pre></div></section></main></body></html> |
