QUIC Working GroupJ. Iyengar, Editor
Internet-DraftI. Swett, Editor
Intended status: Standards TrackGoogle
Expires: July 18, 2017January 14, 2017

dating with schizophrenia new york times QUIC Loss Detection and Congestion Control

draft-ietf-quic-recovery-01

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dating app new york times QUIC is a new multiplexed and secure transport atop UDP. QUIC builds on decades of transport and security experience, and implements mechanisms that make it attractive as a modern general-purpose transport. QUIC implements the spirit of known TCP loss detection mechanisms, described in RFCs, various Internet-drafts, and also those prevalent in the Linux TCP implementation. This document describes QUIC loss detection and congestion control, and attributes the TCP equivalent in RFCs, Internet-drafts, academic papers, and TCP implementations.free dating in china

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free polish dating in uk QUIC is a new multiplexed and secure transport atop UDP. QUIC builds on decades of transport and security experience, and implements mechanisms that make it attractive as a modern general-purpose transport. The QUIC protocol is described in [QUIC-TRANSPORT].singles hiking group los angeles

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dating online in qatar This document first describes pre-requisite parts of the QUIC transmission machinery, then discusses QUIC’s default congestion control and loss detection mechanisms, and finally lists the various TCP mechanisms that QUIC loss detection implements (in spirit.)european dating websites

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hong kong dating site review All transmissions in QUIC are sent with a packet-level header, which includes a packet sequence number (referred to below as a packet number). These packet numbers never repeat in the lifetime of a connection, and are monotonically increasing, which makes duplicate detection trivial. This fundamental design decision obviates the need for disambiguating between transmissions and retransmissions and eliminates significant complexity from QUIC’s interpretation of TCP loss detection mechanisms.top dating sites around the world

hong kong compensated dating site Every packet may contain several frames. We outline the frames that are important to the loss detection and congestion control machinery below.gay dating around the world

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hong kong dating websites QUIC’s packet number is strictly increasing, and directly encodes transmission order. A higher QUIC packet number signifies that the packet was sent later, and a lower QUIC packet number signifies that the packet was sent earlier. When a packet containing frames is deemed lost, QUIC rebundles necessary frames in a new packet with a new packet number, removing ambiguity about which packet is acknowledged when an ACK is received. Consequently, more accurate RTT measurements can be made, spurious retransmissions are trivially detected, and mechanisms such as Fast Retransmit can be applied universally, based only on packet number.best singles club in las vegas

hong kong gay dating site This design point significantly simplifies loss detection mechanisms for QUIC. Most TCP mechanisms implicitly attempt to infer transmission ordering based on TCP sequence numbers - a non-trivial task, especially when TCP timestamps are not available.single clubs in las vegas

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hong kong cupid dating site QUIC ACKs contain information that is equivalent to TCP SACK, but QUIC does not allow any acked packet to be reneged, greatly simplifying implementations on both sides and reducing memory pressure on the sender.why is dating in new york so hard

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free anime dating games for iphone QUIC ACKs explicitly encode the delay incurred at the receiver between when a packet is received and when the corresponding ACK is sent. This allows the receiver of the ACK to adjust for receiver delays, specifically the delayed ack timer, when estimating the path RTT. This mechanism also allows a receiver to measure and report the delay from when a packet was received by the OS kernel, which is useful in receivers which may incur delays such as context-switch latency before a userspace QUIC receiver processes a received packet.singles club new york city


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nigerian dating site in usa We now describe QUIC’s loss detection as functions that should be called on packet transmission, when a packet is acked, and timer expiration events.best singles places in new york city

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free online dating in cameroon Constants used in loss recovery and congestion control are based on a combination of RFCs, papers, and common practice. Some may need to be changed or negotiated in order to better suit a variety of environments.new york city speed dating reviews

  • kMaxTLPs: 2 Maximum number of tail loss probes before an RTO fires.
  • kReorderingThreshold: 3 Maximum reordering in packet number space before FACK style loss detection considers a packet lost.
  • kTimeReorderingThreshold: 1/8 Maximum reordering in time sapce before time based loss detection considers a packet lost. In fraction of an RTT.
  • kMinTLPTimeout: 10ms Minimum time in the future a tail loss probe alarm may be set for.
  • kMinRTOTimeout: 200ms Minimum time in the future an RTO alarm may be set for.
  • kDelayedAckTimeout: 25ms The length of the peer’s delayed ack timer.

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internet dating sites in zimbabwe We first describe the variables required to implement the loss detection mechanisms described in this section.christian speed dating new york city

  • loss_detection_alarm: Multi-modal alarm used for loss detection.
  • alarm_mode: QUIC maintains a single loss detection alarm, which switches between various modes. This mode is used to determine the duration of the alarm.
  • handshake_count: The number of times the handshake packets have been retransmitted without receiving an ack.
  • tlp_count: The number of times a tail loss probe has been sent without receiving an ack.
  • rto_count: The number of times an rto has been sent without receiving an ack.
  • smoothed_rtt: The smoothed RTT of the connection, computed as described in [RFC6298]
  • rttvar: The RTT variance.
  • reordering_threshold: The largest delta between the largest acked retransmittable packet and a packet containing retransmittable frames before it’s declared lost.
  • use_time_loss: When true, loss detection operates solely based on reordering threshold in time, rather than in packet number gaps.
  • sent_packets: An association of packet numbers to information about them.

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   loss_detection_alarm.reset();
   handshake_count = 0;
   tlp_count = 0;
   rto_count = 0;
   reordering_threshold = kReorderingThreshold;
   use_time_loss = false;
   smoothed_rtt = 0;
   rttvar = 0;

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free gay dating in hull QUIC loss detection uses a single alarm for all timer-based loss detection. The duration of the alarm is based on the alarm’s mode, which is set in the packet and timer events further below. The function SetLossDetectionAlarm defined below shows how the single timer is set based on the alarm mode.best singles neighborhood los angeles

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 SetLossDetectionAlarm():
    if (retransmittable packets are not outstanding):
      loss_detection_alarm.cancel();
      return;

    if (handshake packets are outstanding):
      // Handshake retransmission alarm.
      alarm_duration = max(1.5 * smoothed_rtt, kMinTLPTimeout) << handshake_count;
      handshake_count++;
    else if (largest sent packet is acked):
      // Early retransmit alarm.
      alarm_duration = 0.25 x smoothed_rtt;
    else if (tlp_count < kMaxTLPs):
      // Tail Loss Probe alarm.
      if (retransmittable_packets_outstanding = 1):
        alarm_duration = max(1.5 x smoothed_rtt + kDelayedAckTimeout,
                             2 x smoothed_rtt);
      else:
        alarm_duration = max (kMinTLPTimeout, 2 x smoothed_rtt);
      tlp_count++;
    else:
      // RTO alarm.
      if (rto_count = 0):
        alarm_duration = max(kMinRTOTimeout, smoothed_rtt + 4 x rttvar);
      else:
        alarm_duration = loss_detection_alarm.get_delay() << 1;
      rto_count++;

    loss_detection_alarm.set(now + alarm_duration);

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single mom dating in bangalore After any packet is sent, be it a new transmission or a rebundled transmission, the following OnPacketSent function is called. The parameters to OnPacketSent are as follows:dating customs around the world

  • packet_number: The packet number of the sent packet.
  • is_retransmittble: A boolean that indicates whether the packet contains at least one frame requiring reliable deliver. The retransmittability of various QUIC frames is described in [QUIC-TRANSPORT]. If false, it is still acceptable for an ack to be received for this packet. However, a caller MUST NOT set is_retransmittable to true if an ack is not expected.

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 OnPacketSent(packet_number, is_retransmittable):
   # TODO: Clarify the data in sent_packets.
   sent_packets[packet_number] = {now}
   if is_retransmittable:
     SetLossDetectionAlarm()

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   OnAckReceived(ack):
     // If the largest acked is newly acked, update the RTT.
     if (sent_packets[ack.largest_acked]):
       rtt_sample = now - sent_packets[ack.largest_acked]
       if (rtt_sample > ack.ack_delay):
         rtt_sample -= ack.delay;
       UpdateRtt(rtt_sample)
     // Find all newly acked packets.
     for acked_packet in DetermineNewlyAckedPackets():
       OnPacketAcked(acked_packet)

     DetectLostPackets(ack.largest_acked_packet);
     SetLossDetectionAlarm();


   UpdateRtt(rtt_sample):
     if (smoothed_rtt == 0):
       smoothed_rtt = rtt_sample
       rttvar = rtt_sample / 2
     else:
       rttvar = 3/4 * rttvar + 1/4 * (smoothed_rtt - rtt_sample)
       smoothed_rtt = 7/8 * smoothed_rtt + 1/8 * rtt_sample

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indian speed dating new york When a packet is acked for the first time, the following OnPacketAcked function is called. Note that a single ACK frame may newly acknowledge several packets. OnPacketAcked must be called once for each of these newly acked packets.mingling singles meetup las vegas

most popular dating site in belgium OnPacketAcked takes one parameter, acked_packet, which is the packet number of the newly acked packet, and returns a list of packet numbers that are detected as lost.places to meet singles los angeles

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   OnPacketAcked(acked_packet):
     handshake_count = 0;
     tlp_count = 0;
     rto_count = 0;
     # TODO: Don't remove packets immediately, since they can be used for
     # detecting spurous retransmits.
     sent_packets.remove(acked_packet);

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zimbabwe dating in south africa QUIC uses one loss recovery alarm, which when set, can be in one of several modes. When the alarm fires, the mode determines the action to be performed. OnAlarm returns a list of packet numbers that are detected as lost.dating sites new york

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   OnAlarm(acked_packet):
     lost_packets = DetectLostPackets(acked_packet);
     MaybeRetransmitLostPackets();
     SetLossDetectionAlarm();

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   DetectLostPackets(acked_packet):
     lost_packets = {};
     foreach (unacked_packet less than acked_packet):
         if (unacked_packet.time_sent <
             acked_packet.time_sent - kTimeReorderThreshold * smoothed_rtt):
           lost_packets.insert(unacked_packet.packet_number);
       else if (unacked_packet.packet_number <
                acked_packet.packet_number - reordering_threshold)
         lost_packets.insert(unacked_packet.packet_number);
     return lost_packets;

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most popular dating site in hong kong QUIC only reduces its CWND once per congestion window, in keeping with the NewReno RFC. It tracks the largest outstanding packet at the time the loss is declared and any losses which occur before that packet number are considered part of the same loss event. It’s worth noting that some TCP implementations may do this on a sequence number basis, and hence consider multiple losses of the same packet a single loss event.singles in las vegas new mexico

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best dating site reviews australia QUIC implements hybrid slow start, but disables ack train detection, because it has shown to falsely trigger when coupled with packet pacing, which is also on by default in QUIC. Currently the minimum delay increase is 4ms, the maximum is 16ms, and within that range QUIC exits slow start if the min_rtt within a round increases by more than one eighth of the connection michat gay latino new york

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most popular dating apps korea Normative References

[QUIC-TLS]
Thomson, M., Ed. and S. Turner, Ed, Ed., “Using Transport Layer Security (TLS) to Secure QUIC”.
[QUIC-TRANSPORT]
Iyengar, J., Ed. and M. Thomson, Ed., “QUIC: A UDP-Based Multiplexed and Secure Transport”.
[RFC2119]
Bradner, S., “dating agency in new york”, BCP 14, RFC 2119, best dating sites manchester, March 1997, <best dating page on facebook>.
[RFC6298]
Paxson, V., Allman, M., Chu, J., and M. Sargent, “best dating website on facebook”, RFC 6298, best dating in facebook, June 2011, <can you park on a single yellow line in central london on sundays>.

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  • Improved description of constants and ACK behavior

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  • Adopted as base for draft-ietf-quic-recovery.
  • Updated authors/editors list.
  • Added table of contents.

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free dating ads manchester Jana Iyengar (editor)
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