I-D Action: draft-chung-ccwg-search-02.txt

internet-drafts@ietf.org Sun, 21 July 2024 12:02 UTC

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Internet-Draft draft-chung-ccwg-search-02.txt is now available.

   Title:   SEARCH -- a New Slow Start Algorithm for TCP and QUIC
   Authors: Jae Won Chung
            Maryam Ataei Kachooei
            Feng Li
            Mark Claypool
   Name:    draft-chung-ccwg-search-02.txt
   Pages:   15
   Dates:   2024-07-21

Abstract:

   TCP slow start is designed to ramp up to the network congestion point
   quickly, doubling the congestion window each round-trip time until
   the congestion point is reached, whereupon TCP exits the slow start
   phase.  Unfortunately, the default Linux TCP slow start
   implementation -- TCP Cubic with HyStart -- can cause premature exit
   from slow start, especially over wireless links, degrading link
   utilization.  However, without HyStart, TCP exits slow start too
   late, causing unnecessary packet loss.  To improve TCP slow start
   performance, this document proposes using the Slow start Exit At
   Right CHokepoint (SEARCH) algorithm where the TCP sender determines
   the congestion point based on acknowledged deliveries --
   specifically, the sender computes the delivered bytes compared to the
   expected delivered bytes, smoothed to account for link latency
   variation and normalized to accommodate link capacities, and exits
   slow start if the delivered bytes are lower than expected.  We
   implemented SEARCH as a Linux kernel v5.16 module and evaluated it
   over WiFi, 4G/LTE, and low earth orbit (LEO) and geosynchronous (GEO)
   satellite links.  Analysis of the results show that the SEARCH
   reliably exits from slow start after the congestion point is reached
   but before inducing packet loss.

The IETF datatracker status page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-chung-ccwg-search/

There is also an HTMLized version available at:
https://datatracker.ietf.org/doc/html/draft-chung-ccwg-search-02

A diff from the previous version is available at:
https://author-tools.ietf.org/iddiff?url2=draft-chung-ccwg-search-02

Internet-Drafts are also available by rsync at:
rsync.ietf.org::internet-drafts

I-D Action: draft-chung-ccwg-search-02.txt internet-drafts