Opened 7 weeks ago

#31 new defect

prague/dualpi2 under-utilization with bi-directional traffic in low bandwidth, asymmetric links

Reported by: pete@… Owned by: draft-ietf-tsvwg-l4s-arch@…
Priority: major Milestone:
Component: l4s-arch Version:
Severity: - Keywords:
Cc:

Description

In the following test result of bi-directional traffic over a 1/10Mbit asymmetric link, we noticed the download throughput dropping to near 0 for long periods of time, and an overall mean throughput of around 1Mbit, well below the 10Mbit capacity of the link:

​http://sce.dnsmgr.net/results/ect1-2020-05-07T143702-s8-s9/l4s-s9-bidir-asym-1mbit/l4s-s9-bidir-asym-1mbit-ns-prague-dualpi2-1Mbit-10Mbit-20ms_all_scaled_delivery.svg

The resulting box plot is here:

​http://sce.dnsmgr.net/results/ect1-2020-05-07T143702-s8-s9/l4s-s9-bidir-asym-1mbit/l4s-s9-bidir-asym-1mbit-ns-prague-dualpi2-1Mbit-10Mbit-20ms_box_totals.svg

Client and server pcaps are here:

​http://sce.dnsmgr.net/results/ect1-2020-05-07T143702-s8-s9/l4s-s9-bidir-asym-1mbit/batch-l4s-s9-bidir-asym-1mbit-ns-prague-dualpi2-1Mbit-10Mbit-20ms.tcpdump_cli_cli.r.pcap.xz

​http://sce.dnsmgr.net/results/ect1-2020-05-07T143702-s8-s9/l4s-s9-bidir-asym-1mbit/batch-l4s-s9-bidir-asym-1mbit-ns-prague-dualpi2-1Mbit-10Mbit-20ms.tcpdump_srv_srv.l.pcap.xz

The qdisc setup is documented in this log file:

​http://sce.dnsmgr.net/results/ect1-2020-05-07T143702-s8-s9/l4s-s9-bidir-asym-1mbit/batch-l4s-s9-bidir-asym-1mbit-ns-prague-dualpi2-1Mbit-10Mbit-20ms.teardown.log

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