QUIC Working GroupJ. Iyengar, Editor
Internet-DraftI. Swett, Editor
Intended status: Standards TrackGoogle
Expires: June 1, 2017November 28, 2016

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draft-ietf-quic-recovery-00

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whatsapp messenger kostenlos anmelden 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.kostenlos registrieren msn

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most popular dating app in europe 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].immobilienscout kostenlos registrieren

pferdespiele kostenlos anmelden QUIC implements the spirit of known TCP loss recovery mechanisms, described in RFCs, various Internet-drafts, and also those prevalent in the Linux TCP implementation. This document describes QUIC congestion control and loss recovery, and where applicable, attributes the TCP equivalent in RFCs, Internet-drafts, academic papers, and/or TCP implementations.kostenlos icq anmelden

pferdespiele kostenlos testen 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.)kostenlos anmelden itunes

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msn kostenlos anmelden deutsch 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.christian dating uk free

drivenow kostenlos registrieren berlin Every packet may contain several frames. We outline the frames that are important to the loss detection and congestion control machinery below.www.free online dating site.com

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farmerama kostenlos anmelden und spielen There are some notable differences between QUIC and TCP which are important for reasoning about the differences between the loss recovery mechanisms employed by the two protocols. We briefly describe these differences below.south american dating apps

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farmerama kostenlos testen TCP conflates transmission sequence number at the sender with delivery sequence number at the receiver, which results in retransmissions of the same data carrying the same sequence number, and consequently to problems caused by “retransmission ambiguity”. QUIC separates the two: QUIC uses a packet sequence number (referred to as the “packet number”) for transmissions, and any data that is to be delivered to the receiving application(s) is sent in one or more streams, with stream offsets encoded within STREAM frames inside of packets that determine delivery order.herpes dating uk free

farmerama kostenlos ohne registrieren 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 free dating site uk forum

psn kostenlos anmelden 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.beste gay dating app

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psn anmelden kostenlos ps4 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.black white dating germany

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freenet singles löschen QUIC supports up to 256 ACK ranges, opposed to TCP’s 3 SACK ranges. In high loss environments, this speeds recovery.amway kostenlos registrieren

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freenet singles login 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.kostenlos registrieren bei avast


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freenet singles profil löschen 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.arcor kostenlos registrieren

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christian dating for christian singles join free We first describe the variables required to implement the loss detection mechanisms described in this section.single holiday south america

  • 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]. TODO: Describe RTT computations.
  • reordering_threshold: The largest delta between the largest acked retransmittable packet and a packet containing retransmittable frames before it’s declared lost.
  • time_loss: When true, loss detection operates solely based on reordering threshold in time, rather than in packet number gaps.

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parship kostenlos anmelden At the beginning of the connection, initialize the loss detection variables as follows:top 10 online free dating sites

   loss_detection_alarm.reset();
   handshake_count = 0;
   tlp_count = 0;
   rto_count = 0;
   smoothed_rtt = 0;
   reordering_threshold = 3;
   time_loss = false;

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freenet singles abo kündigen 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.south american singles cruises

freenet singles app Pseudocode for SetLossDetectionAlarm follows:online dating india no registration

 SetLossDetectionAlarm():
    if (retransmittable packets are not outstanding):
      loss_detection_alarm.cancel();
      return;
    if (handshake packets are outstanding):
      alarm_duration = max(1.5 * smoothed_rtt, 10ms) << handshake_count;
      handshake_count++;
    else if (largest sent packet is acked):
      // Set alarm based on short timer for early retransmit.
      alarm_duration = 0.25 x smoothed_rtt;
    else if (tlp_count < 2):
      if (retransmittable_packets_outstanding = 1):
        alarm_duration = max(1.5 x smoothed_rtt + delayed_ack_timer,
                             2 x smoothed_rtt);
      else:
        alarm_duration = max (10ms, 2 x smoothed_rtt);
      tlp_count++;
    else:
      if (rto_count = 0):
        alarm_duration = max(200ms, 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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freenet singles anmelden 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:best dating sites london ontario

  • 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):
     if is_retransmittable:
       SetLossDetectionAlarm()

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dating site in canada free 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.gay dating site london

kostenlos ohne anmeldung flirt chat 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.gay dating northern ireland

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   OnPacketAcked(acked_packet):
     handshake_count = 0;
     tlp_count = 0;
     rto_count = 0;
     UpdateRtt(); // TODO: document RTT estimator.
     DetectLostPackets(acked_packet);
     SetLossDetectionAlarm();

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kostenlos ohne anmeldung alchemy mahjong spielen 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.cherry blossoms dating login

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

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moviestarplanet kostenlos anmelden und spielen deutsch Packets in QUIC are only considered lost once a larger packet number is acknowledged. DetectLostPackets is called every time there is a new largest packet or if the loss detection alarm fires the previous largest acked packet is supplied.free online dating dublin ireland

moviestarplanet kostenlos registrieren DetectLostPackets takes one parameter, acked_packet, which is the packet number of the largest acked packet, and returns a list of packet numbers detected as lost.online dating profile bio

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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 - 1/8 * 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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freenet.de singlebörse QUIC calculates SRTT and RTTVAR according to the standard formulas. An RTT sample is only taken if the delayed ack correction is smaller than the measured RTT (otherwise a negative RTT would result), and the ack’s contains a new, larger largest observed packet number. min_rtt is only based on the observed RTT, but SRTT uses the delayed ack correction delta.best dating sites in europe 2014

singles freenet de cockpit As described above, QUIC implements RTO with the standard timeout and CWND reduction. However, QUIC retransmits the earliest outstanding packets rather than the latest, because QUIC doesn’t have retransmission ambiguity. QUIC uses the commonly accepted min RTO of 200ms instead of the 1s the RFC specifies.best european dating site

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freenet singles mitgliedschaft kündigen QUIC implements the algorithm for early loss recovery described in the FACK paper (and implemented in the Linux kernel.) QUIC uses the packet number to measure the FACK reordering threshold. Currently QUIC does not implement an adaptive threshold as many TCP implementations (i.e., the Linux kernel) do.best eastern european dating site

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freenet singles mahnung 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.tumblr registrierung kostenlos

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freenet singles plus mitgliedschaft kündigen QUIC always sends two tail loss probes before RTO is triggered. QUIC invokes tail loss probe even when a loss is outstanding, which is different than some TCP implementations.single girl travelling south america

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freenet singles mobil QUIC implements F-RTO by not reducing the CWND and SSThresh until a subsequent ack is received and it’s sure the RTO was not spurious. Conceptually this is similar, but it makes for a much cleaner implementation with fewer edge cases.dating rules in united states

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best gay dating site in europe PRR-SSRB is implemented by QUIC in the epoch when recovering from a loss.dating app united states

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kostenlos bei google anmelden 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 mitop ten european dating sites

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kostenlos bei google eintragen lassen QUIC’s loss detection is by it’s time-ordered nature, very similar to RACK. Though QUIC defaults to loss detection based on reordering threshold in packets, it could just as easily be based on fractions of an rtt, as RACK does.dating website first message template


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singles south america tours 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., “best south american tours for singles”, BCP 14, RFC 2119, best christian dating site in europe, March 1997, <best dating sites in europe 2016>.
[RFC6298]
Paxson, V., Allman, M., Chu, J., and M. Sargent, “apple udid kostenlos registrieren”, RFC 6298, iphone udid kostenlos registrieren, June 2011, <kostenlos udid eintragen>.

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kostenlos ohne anmeldung spielen merkur Jana Iyengar (editor)
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