Tcp and sctp rto restart draft ietf tcpm rtorestart 01 tcpm wg ietf 88
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TCP and SCTP RTO Restart draft-ietf-tcpm-rtorestart-01 TCPM WG IETF-88 PowerPoint PPT Presentation


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TCP and SCTP RTO Restart draft-ietf-tcpm-rtorestart-01 TCPM WG IETF-88. P. Hurtig, A. Brunstrom, A. Petlund , M. Welzl. RTO Restart. As the RTO timer is restarted on an incoming ACK (RFC 6298, RFC 4960), the effective RTO often becomes RTO = RTO + t Where t ≈ RTT [+ delACK ]

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TCP and SCTP RTO Restart draft-ietf-tcpm-rtorestart-01 TCPM WG IETF-88

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Tcp and sctp rto restart draft ietf tcpm rtorestart 01 tcpm wg ietf 88

TCP and SCTP RTO Restartdraft-ietf-tcpm-rtorestart-01TCPM WGIETF-88

P. Hurtig, A. Brunstrom, A. Petlund, M. Welzl


Rto restart

RTO Restart

  • As the RTO timer is restarted on an incoming ACK (RFC 6298, RFC 4960), the effective RTO often becomesRTO = RTO + t

    • Where t ≈ RTT [+delACK]

  • RTO restart adjusts the RTO so that retransmissions are performed after exactly RTO seconds

  • The modified restart is only used when

    • the number of outstanding segments < 4;

    • and there is no unsent data ready for transmission.

    • Thus, only flows incapable of FR can use modified RTO restart


Updates to draft 1

Updatesto draft (1)

  • New section that discusses the applicability of and problems related to the RTO restart mechanism

    • Reduces the loss detection time and thereby increases the risk of spurious timeouts in some situations

    • Impact of spurious RTO is negligible for short flows and thin streams

    • Spurious RTO can be a problem for flows with multiple bursts, as cwndis reduced

    • Further experience related to spurious RTOs required to move specification from experimental to proposed standard


Updates to draft 2

Updatesto draft (2)

  • Removed the possibility for a connection limited by the receiver's advertised window to use RTO restart

    • Gain for this scenario unclear

    • Decreasing the risk of spurious timeouts


Updates to draft 3

Updatesto draft (3)

  • Improved wording throughout the document

  • Updates to the text that describe RTO restart's relation to TLP

  • Acknowledgments added


Implementation

Implementation

  • Updated for the 3.12 Linux kernel

    • http://riteproject.eu/projects/wp1-end-systems-and-applications/rto-restart/


Tcp and sctp rto restart draft ietf tcpm rtorestart 01 tcpm wg ietf 88

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