QUIC Working GroupJ. Iyengar, Editor
Internet-DraftI. Swett, Editor
Intended status: Standards TrackGoogle
Expires: September 14, 2017March 13, 2017

best free online dating sites in canada QUIC Loss Detection and Congestion Control

draft-ietf-quic-recovery-02

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100 percent free europe dating sites 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.best fb chat app for java

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100 free dating sites 2014 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].best 100 free australian dating sites

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100 free dating germany 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.)100 free american dating sites

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free singles dating sites in usa 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.anime dating sims for guys pc

gratis dating chat seite Every packet may contain several frames. We outline the frames that are important to the loss detection and congestion control machinery below.best free online dating apps 2013

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100 percent free dating site in europe 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.play anime dating sims online free

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online dating sites reviews 2013 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.free dating sites uk

best online dating sites uk 2012 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.free dating sites

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online dating sites in us 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.top 10 online dating site in usa

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best online dating sites uk 2014 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.free online dating without registration

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best online dating sites uk 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.100 free online dating sites in canada

kMaxTLPs (default 2):
Maximum number of tail loss probes before an RTO fires.
kReorderingThreshold (default 3):
Maximum reordering in packet number space before FACK style loss detection considers a packet lost.
kTimeReorderingFraction (default 1/8):
Maximum reordering in time sapce before time based loss detection considers a packet lost. In fraction of an RTT.
kMinTLPTimeout (default 10ms):
Minimum time in the future a tail loss probe alarm may be set for.
kMinRTOTimeout (default 200ms):
Minimum time in the future an RTO alarm may be set for.
kDelayedAckTimeout (default 25ms):
The length of the peer’s delayed ack timer.
kDefaultInitialRtt (default 100ms):
The default RTT used before an RTT sample is taken.

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best free online dating sites uk We first describe the variables required to implement the loss detection mechanisms described in this section.free online indian dating without registration

loss_detection_alarm:
Multi-modal alarm used for loss detection.
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, computed as described in [RFC6298]
initial_rtt:
The initial RTT used before any RTT measurements have been made.
reordering_threshold:
The largest delta between the largest acked retransmittable packet and a packet containing retransmittable frames before it’s declared lost.
time_reordering_fraction:
The reordering window as a fraction of max(smoothed_rtt, latest_rtt).
loss_time:
The time at which the next packet will be considered lost based on early transmit or exceeding the reordering window in time.
sent_packets:
An association of packet numbers to information about them, including a number field indicating the packet number, a time field indicating the time a packet was sent, and a bytes field indicating the packet’s size. sent_packets is ordered by packet number, and packets remain in sent_packets until acknowledged or lost.

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best online dating sites uk 2015 At the beginning of the connection, initialize the loss detection variables as follows:top 10 free dating websites uk

   loss_detection_alarm.reset()
   handshake_count = 0
   tlp_count = 0
   rto_count = 0
   if (UsingTimeLossDetection())
     reordering_threshold = infinite
     time_reordering_fraction = kTimeReorderingFraction
   else:
     reordering_threshold = kReorderingThreshold
     time_reordering_fraction = infinite
   loss_time = 0
   smoothed_rtt = 0
   rttvar = 0
   initial_rtt = kDefaultInitialRtt

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free online chat physic reading 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:free online chat astrology consultation

  • 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.
  • sent_bytes: The number of bytes sent in the packet.

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 OnPacketSent(packet_number, is_retransmittable, sent_bytes):
   sent_packets[packet_number].packet_number = packet_number
   sent_packets[packet_number].time = now
   if is_retransmittable:
     sent_packets[packet_number].bytes = sent_bytes
     SetLossDetectionAlarm()

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free online doctor chat rooms When an ack is received, it may acknowledge 0 or more packets.christian counseling chat rooms

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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].time
       if (rtt_sample > ack.ack_delay):
         rtt_sample -= ack.delay
       UpdateRtt(rtt_sample)
     // Find all newly acked packets.
     for acked_packet_number in DetermineNewlyAckedPackets():
       OnPacketAcked(acked_packet_number)

     DetectLostPackets(ack.largest_acked_packet)
     SetLossDetectionAlarm()


   UpdateRtt(rtt_sample):
     // Based on {{RFC6298}}.
     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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top 10 free online dating sites uk 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.top ten international dating sites

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   OnPacketAcked(acked_packet_number):
     handshake_count = 0
     tlp_count = 0
     rto_count = 0
     sent_packets.remove(acked_packet_number)

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reputable online dating sites canada 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.free online chatting with astrologers india

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native american chat line The initial flight has no prior RTT sample. A client SHOULD remember the previous RTT it observed when resumption is attempted and use that for an initial RTT value. If no previous RTT is available, the initial RTT defaults to 200ms. Once an RTT measurement is taken, it MUST replace initial_rtt.top 10 free dating sites in usa

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

    if (handshake packets are outstanding):
      // Handshake retransmission alarm.
      if (smoothed_rtt == 0):
        alarm_duration = 2 * initial_rtt
      else:
        alarm_duration = 2 * smoothed_rtt
      alarm_duration = max(alarm_duration, kMinTLPTimeout)
      alarm_duration = alarm_duration << handshake_count
    else if (loss_time != 0):
      // Early retransmit timer or time loss detection.
      alarm_duration = loss_time - now
    else if (tlp_count < kMaxTLPs):
      // Tail Loss Probe
      if (retransmittable_packets_outstanding = 1):
        alarm_duration = 1.5 * smoothed_rtt + kDelayedAckTimeout
      else:
        alarm_duration = kMinTLPTimeout
      alarm_duration = max(alarm_duration, 2 * smoothed_rtt)
    else:
      // RTO alarm
      if (rto_count = 0):
        alarm_duration = smoothed_rtt + 4 * rttvar
        alarm_duration = max(alarm_duration, kMinRTOTimeout)
      else:
        alarm_duration = loss_detection_alarm.get_delay() << 1

    loss_detection_alarm.set(now + alarm_duration)

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   OnLossDetectionAlarm():
     if (handshake packets are outstanding):
       // Handshake retransmission alarm.
       RetransmitAllHandshakePackets();
       handshake_count++;
     // TODO: Clarify early retransmit and time loss.
     else if (loss_time != 0):
       // Early retransmit or Time Loss Detection
       DetectLostPackets(largest_acked_packet)
     else if (tlp_count < kMaxTLPs):
       // Tail Loss Probe.
       if (HasNewDataToSend()):
         SendOnePacketOfNewData()
       else:
         RetransmitOldestPacket()
       tlp_count++
     else:
       // RTO.
       RetransmitOldestTwoPackets()
       rto_count++

     SetLossDetectionAlarm()

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best new free dating sites 2014 Packets in QUIC are only considered lost once a larger packet number is acknowledged. DetectLostPackets is called every time an ack is received. If the loss detection alarm fires and the loss_time is set, the previous largest acked packet is supplied.free dating singles in usa

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latest 2014 free dating site The receiver MUST ignore unprotected packets that ack protected packets. The receiver MUST trust protected acks for unprotected packets, however. Aside from this, loss detection for handshake packets when an ack is processed is identical to other packets.free germany online dating sites

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chat with online therapists free DetectLostPackets takes one parameter, acked, which is the largest acked packet.free online dating and chatting sites in india

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   DetectLostPackets(largest_acked):
     loss_time = 0
     lost_packets = {}
     delay_until_lost = infinite;
     if (time_reordering_fraction != infinite):
       delay_until_lost =
         (1 + time_reordering_fraction) * max(latest_rtt, smoothed_rtt)
     else if (largest_acked.packet_number == largest_sent_packet):
       // Early retransmit alarm.
       delay_until_lost = 9/8 * max(latest_rtt, smoothed_rtt)
     foreach (unacked less than largest_acked.packet_number):
       time_since_sent = now() - unacked.time_sent
       packet_delta = largest_acked.packet_number - unacked.packet_number
       if (time_since_sent > delay_until_lost):
         lost_packets.insert(unacked)
       else if (packet_delta > reordering_threshold)
         lost_packets.insert(unacked)
       else if (loss_time == 0 && delay_until_lost != infinite):
         loss_time = delay_until_lost - time_since_sent

     // Inform the congestion controller of lost packets and
     // lets it decide whether to retransmit immediately.
     OnPacketsLost(lost_packets)
     foreach (packet in lost_packets)
       sent_packets.remove(packet.packet_number)

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chat with counselor free (describe NewReno-style congestion control [RFC6582] for QUIC.) (describe appropriate byte counting.) (define recovery based on packet numbers.) (describe min_rtt based hystart.) (describe how QUIC’s F-RTO [RFC5682] delays reducing CWND.) (describe PRR [RFC6937])free chat rooms chennai females


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live chat room america References

suche frau fürs bett ab 50 Normative References

[QUIC-TRANSPORT]
Iyengar, J., Ed. and M. Thomson, Ed., “QUIC: A UDP-Based Multiplexed and Secure Transport”.
[RFC2119]
Bradner, S., “suche frau fürs bett berlin”, BCP 14, RFC 2119, suche frau fürs bett ch, March 1997, <suche frau fürs bett wien>.

chat n date online indonesia Informative References

[I-D.dukkipati-tcpm-tcp-loss-probe]
Dukkipati, N., Cardwell, N., Cheng, Y., and M. Mathis, “100 free asian dating sites usa”, Internet-Draft draft-dukkipati-tcpm-tcp-loss-probe-01 (work in progress), February 2013.
[RFC5682]
Sarolahti, P., Kojo, M., Yamamoto, K., and M. Hata, “100 free asian dating sites”, RFC 5682, google chat application for windows 7, September 2009, <100 free online gay dating sites>.
[RFC5827]
Allman, M., Avrachenkov, K., Ayesta, U., Blanton, J., and P. Hurtig, “free online gay dating sites in usa”, RFC 5827, top free online gay dating sites, May 2010, <free online dating chat no credit card>.
[RFC6298]
Paxson, V., Allman, M., Chu, J., and M. Sargent, “totally free online dating no credit card”, RFC 6298, free online dating no credit cards required, June 2011, <3d chat spiele online>.
[RFC6582]
Henderson, T., Floyd, S., Gurtov, A., and Y. Nishida, “completely free online dating sites uk”, RFC 6582, absolutely free online dating sites uk, April 2012, <sweden dating sites in english>.
[RFC6937]
Mathis, M., Dukkipati, N., and Y. Cheng, “free music chat rooms no registration”, RFC 6937, online dating site in india free chat, May 2013, <100 percent free american dating sites>.

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  • Changes initial default RTT to 100ms
  • Added time-based loss detection and fixes early retransmit
  • Clarified loss recovery for handshake packets
  • Fixed references and made TCP references informative

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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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