• <div><p>This pull request introduces transport hints to specify the TCP-NO-DELAY option when creating a new subscriber. Furthermore, it also processes the TCP-NO-DELAY header field for incoming ...
  • [1] Low Extra Delay Background Transport (LEDBAT) http://tools.ietf.org/html/rfc6817 What is LEDBAT? LEDBAT, Developed by BitTorrent and approved by IETF in Dec.2012, is a new applicati


    [1] Low Extra Delay Background Transport (LEDBAT)


    What is LEDBAT?

    LEDBAT, Developed by BitTorrent and approved by IETF in Dec.2012, is a new application layer congestion control algorithm, LEDBAT aims to enable the background bulk-transfer applications (e.g. large file transfers, software updating, etc) to be assigned a priority lower than standard TCP and interactive traffic (e.g. VoIP, online gaming, etc). It can be used with any application.

    Basic idea

    Standard TCP congestion control is activated when loss is detected or ECN mark is received, which occurs only when bottleneck link overflows or active queue management (ARQ) is applied. In summary, the increase in queueing delay precedes the phenomenon of loss and ECN marking. LEDBAT utilizes the increase in queueing delay as an early indication of congestion, enabling itselft to report congestion earlier than standard TCP.

    LEDBAT employs one-way delay measurements to estimate queueing delayWhen the estimated queueing delay is less than a predetermined target, LEDBAT infers that the network is not yet congested and increases its sending rate to utilize any spare capacity in the network.  When the estimated queueing delay becomes greater than the predetermined target, LEDBAT decreases its sending rate as a response to potential congestion in the network.

    Queueing Delay Estimation

    LEDBAT uses data packets to estimate queueing delay, without additional measurement packets. 

    End-to-end delay consists of 1) transmission delay 2) propagation delay 3) processing delay 4) queueing delay. Except the queueing delay, the sum of the first three delays (base delay) are constant (in the absence of any route changes), thus, queueing delay is additive to the end-to-end delay. LEDBAT estimates the queuesing delay simply equals the difference of the end-to-end delay measurement and the current estimate of base delay. The queueing delay needs to be filtered to eliminated noise, such as spike in processing delay.

    Features of LEDBAT

    • avoid bulk-transfer flows from persistently delaying other flows sharing the same queue.

    Applicability [1]

    works with transport protocol and applications which are capable of carrying timestamps (for queueing delay estimation) and acknowledging data frequently (for reporting congestion), such as TCP, SCTP, DCCP, P2P over UDP, etc.

  • <div><p>…dia until DTLS handshake is done <p>Without this we are going to drop the initial keyframe most of the time as we will try to send it before DTLS and ICE are ready. Also we will often let ...
  • Delay_causality_network_in_air_transport_systems.pdf
  • Priority and delay aware packet management framework for real-time video transport over 802.11e WLANs
  • Delay Information

    2020-12-08 19:18:01
    <div><p>There are two options for getting the (arrival) delay of a train. One is to read the field stationboard.prognosis.arrival and subtract the value in stationboard....OpendataCH/Transport</p></div>
  • Transport Resumption

    2020-12-27 16:48:27
    <p>Hence, when the client looses the uplink router connection during a Wifi handover, the application only sees a slight delay in responses to WAMP requests (eg CALL a remote procedure, or PUBLISH ...
  • login, password, delay_plugin_installed" under "enqueue.transport.rabbitmq_amqp" in /var/www/html/vendor/symfony/config/Definition/ArrayNode.php on line 319</code> Send a message with : ...
  • max delay reached

    2020-12-27 11:17:34
    0x32ce310] max delay reached. need to consume packetbitrate= 223.6kbits/s dup=88 drop=5 speed=0.374x [rtsp @ 0x32ce310] RTP: missed 705 packets [h264 @ 0x3352050] error...
  • <p>Upto now I worked under the assumption that the delay information is just not working because it is realtime information, and I was not too bothered by that. However according to #108 #109 or #151 ...
  • <div><p>Some time delay occurs in ...On specifying the transport layer Manually to WebSockets or LongPolling The delay is not there</p><p>该提问来源于开源项目:DyKnow/SignalR-ObjC</p></div>
  • - Use default HTTP transport or pass in custom implementation - Setup acceptable status code ranges, retry on EOF, a delay time-base, max retries and global timeout - Backoff-delay strategies: ...
  • Delay stamps not supported

    2020-12-08 22:47:35
    <div><p>I'm using Symfony's Messenger component, going through this interop layer and finally going through Enqueue. <p>It seems like envelopes are ...sroze/messenger-enqueue-transport</p></div>
  • Delay using multiple cameras

    2020-12-01 19:33:29
    s Inter-Packet Delay in the Transport Layer category to reduce the required bandwidth, and adjust the camera's Packet Size setting to the highest supported frame size." <p>Therefore I decided...
  • Delay not reported anymore

    2020-12-01 13:16:38
    <div><p>I have always <code>delay: null</code> since August (more or less). I caught the issue today. <p>I was querying on station Mendrisio S. Martino (stationboard API ...OpendataCH/Transport</p></div>
  • <p>However, the delay for modeling transport delay isn't modeled by <code>FGActuator, rather it's modeled by it's base class <code>FGFCSComponent::Delay()</code> which doesn't make use...
  • delay is always null

    2020-12-08 19:18:02
  • Besides train schedule data, Travic is even using real-time position of trains, plus it is illustrating the current delay, for regions in which the required data is publicly accessible. The potential...
  • Add delay times to Sydney

    2020-12-02 07:42:30
    <p>Apparently this is who I ask for Sydney delay times, so if you could add those, that would be greatly appreciated. Thanks!</p><p>该提问来源于开源项目:schildbach/public-transport-enabler</p>...
  • at com.github.nkzawa.engineio.client.Transport.onError(Transport.java:63) at com.github.nkzawa.engineio.client.transports.PollingXHR.access$100(PollingXHR.java:19) at ...
  • <p>This would allow the application to implement counters to retry a failing transport a number of times, even introduce a delay before retrying (and therefore this may have impacts on the backoff ...
  • In all cases, the keyboard continued operation with no apparent loss of key presses or delay. <h3>Other Changes <p>During development, it was discovered that the main loop on the receiver was very ...
  • <div><p>Sec 7.3.1 of quic-transport says: A client that attempts to send 0-RTT data MUST remember the transport parameters used by the server. The transport parameters that the server advertises ...
  • Growing delay in RTSP stream

    2020-12-30 09:54:26
    rtsp_transport"] = "tcp"; e.Options.Format.FlagNoBuffer = true; e.Options.Format.ProbeSize = 40000; e.Options.Format.MaxAnalyzeDuration = System.TimeSpan.Zero; } ...
  • m puzzled about use rtps to discovery and tcp transport to delivery data,the first data will delay about 10 secondes, help me~~~thank you.</p><p>该提问来源于开源项目:objectcomputing/OpenDDS</p>...
  • QUIC Transport: Flow Control

    2020-12-30 03:19:18
    It does not yet motivate the use of adding credit when this is needed - which is also an important design consideration for a user of QUIC transport, as it is for http. - That is, the section should...
  • Omission of the following details may delay your support request or receive no attention at all. <em>Keep in mind that the commands we provide to retrieve information are oriented to GNU/Linux ...
  • <div><p>Currently the recovery draft specifies a default... This should be communicated via transport params. <p>A similar proposal exists to add this to TCP, we should ensure it exists in QUIC as well. ...
  • Most of the time it works fine but we are intermittently seeing a situation where there is a ~30 second delay part-way through the connection upgrade process, and no messages are received during this...



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