https://wiki.nplab.de/ 2026-04-30T14:54:24+00:00 https://wiki.nplab.de/ https://wiki.nplab.de/lib/exe/fetch.php?media=wiki:dokuwiki.svg text/html 2021-07-12T15:15:26+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.nplab.de/doku.php?id=public:congestion_avoidance_on_a_lossy_link&rev=1626102926&do=diff Congestion Avoidance on a lossy link Mathis et. al. gave us in its paper The Macroscopic Behavior of the TCP Congestion Avoidance Algorithm a simple formula for throughput for specific scenario. The scenario is a single TCP sender sends full sized segments to a TCP receiver over a link with high bandwidth, a constant delay, and a fixed packet loss rate. The condition for the formula is that the bandwidth is high enough, such that the fixed packet loss limits the throughput. text/html 2024-04-23T13:16:27+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.nplab.de/doku.php?id=public:impressum&rev=1713878187&do=diff Impressum Angaben gemäß § 5 TMG FH Münster University of Applied Sciences vertreten durch den Präsidenten Hüfferstraße 27, 48149 Münster Umsatzsteuer-ID-Nummer: DE 154136385 Aufsichtsbehörde Ministerium für Kultur und Wissenschaft des Landes Nordrhein-Westfalen text/html 2021-07-12T15:17:20+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.nplab.de/doku.php?id=public:omnet_inet_packetdrill&rev=1626103040&do=diff OMNeT++/INET Packetdrill Packetdrill in INET consists of * Node (src/inet/node/packetdrill/PacketDrillQuicHost.ned) * Tests (tests/packetdrill) * Application (src/inet/applications/packetdrill) With a Packetdrill test script, it is possible to check the content and the time of packets a host sends. The expected behavior is described in the script (in a line with text/html 2021-07-12T15:18:52+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.nplab.de/doku.php?id=public:sendqueuelimit&rev=1626103132&do=diff sendQueueLimit QUIC uses the parameter sendQueueLimit to limit the size of total data in the send queues of the streams. The send queue includes unsent data, sent but unacked data, and lost data. When we reach this limit, we notify the application that we are not able to accept any more data. If this happens, we wait until the size of total data in the send queues is down to (sendQueueLimit * sendQueueLowWaterRatio), before we notify the application that we are able to accept data again. text/html 2021-07-12T15:17:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.nplab.de/doku.php?id=public:send_acknowledgment&rev=1626103077&do=diff When to send an acknowledgment? From quic-transport-24 draft, section 13.2. " Endpoints acknowledge all packets they receive and process. However, only ack-eliciting packets cause an ACK frame to be sent within the maximum ack delay. Packets that are not ack-eliciting are only text/html 2021-07-12T14:47:46+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.nplab.de/doku.php?id=public:sizing_router_buffer&rev=1626101266&do=diff Sizing Router Buffer For a single long lived QUIC connection over a bottleneck link, what is the best buffer size for the router before the bottleneck link. A buffer that is too big adds queuing delay. A buffer that is too small has a negative effect on the throughput. text/html 2021-07-12T14:52:40+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.nplab.de/doku.php?id=public:start&rev=1626101560&do=diff Public Documents QUIC Simulation * Congestion Avoidance on a lossy link * OMNeT INET Packetdrill * Send Acknowledgment * sendQueueLimit * Sizing Router Buffer