A device for avionics full-duplex switched Ethernet (AFDX) communication can include a transmit port for transmitting AFDX data and a processor. The processor can be configured to obtain AFDX data frames for transmission over a plurality of sub-virtual links (subVLs) of a virtual link (VL), and maintain, for each of the plurality of subVLs, a corresponding data queue by storing AFDX data frames associated with that subVL in the corresponding data queue. The processor can transmit the AFDX data frames from the plurality of data queues on the plurality subVLs via the transmit port according to a scheduling policy that is based on subVL prioritization. The scheduling policy that is based on subVL prioritization can include static priority (SPn) scheduling, earliest deadline first (EDF) scheduling, or least laxity first (LLF) scheduling.

To more efficiently utilize buffer resources, schedulers within a traffic manager may generate and queue read instructions for reading buffered portions of data units that are ready to be sent to the egress blocks. The traffic manager may be configured to select a read instruction for a given buffer bank from the read instruction queues based on a scoring mechanism or other selection logic. To avoid sending too much data to an egress block during a given time slot, once a data unit portion has been read from the buffer, it may be temporarily stored in a shallow read data cache. Alternatively, a single, non-bank specific controller may determine all of the read instructions and write operations that should be executed in a given time slot. The read instruction queue architecture may be duplicated for link memories and other memories in addition to the buffer memory.

According to an embodiment, a transfer control device controls transfer of data stored in a communication device. The transfer control device includes a memory and one or more hardware processors electrically coupled to the memory and configured to function as a control unit, and a determining unit. The control unit performs control for transferring the data to a first transmission buffer. The determining unit determines, depending on a state of the communication device, data to be restricted from being transferred. When transfer is to be restricted, the control unit delays transfer of data to be restricted from being transferred.

A packet forwarding method includes receiving N Time-Sensitive Networking (TSN) packet flows, where each of the N TSN packet flows corresponds to a constraint condition that defines duration of a cycle, a maximum quantity of packets that are allowed to be transmitted in the cycle, and a maximum length of a single packet, and forwarding the N TSN packet flows based on a new constraint condition, where the new constraint condition is based on the constraint condition corresponding to each of the N TSN packet flows and defines duration of a new cycle, a new maximum quantity of new packets that are allowed to be transmitted in the new cycle, and a new maximum length of a new packet, where each of the N TSN packet flows is forwarded in a case in which a corresponding constraint condition is complied with.

Approaches, techniques, and mechanisms are disclosed for improving operations of a network switching device and/or network-at-large by utilizing queue delay as a basis for measuring congestion for the purposes of Automated Queue Management (AQM) and/or other congestion-based policies. Queue delay is an exact or approximate measure of the amount of time a data unit waits at a network device as a consequence of queuing, such as the amount of time the data unit spends in an egress queue while the data unit is being buffered by a traffic manager. Queue delay may be used as a substitute for queue size in existing AQM, Weighted Random Early Detection (WRED), Tail Drop, Explicit Congestion Notification (ECN), reflection, and/or other congestion management or notification algorithms. Or, a congestion score calculated based on the queue delay and one or more other metrics, such as queue size, may be used as a substitute.

A packet forwarding method, an electronic device, and a storage medium are disclosed. The method may include: determining a flow identifier of the service flow; determining a basic time slot number of a first packet in the service flow according to the flow identifier; determining a time slot offset of the first node for the service flow according to the flow identifier; and determining an enqueue slot number of the first packet according to the basic time slot number and the time slot offset.

Provided is a server delay control device for a server in which an OS having a kernel is deployed. The OS includes: a ring buffer managed by the kernel; and a poll list in which information on a net device of a hardware interrupt from an NIC is registered. The server delay control device is deployed in the server and configured to receive a timer interrupt at predetermined specified intervals and monitors a packet arrival and includes: a packet arrival monitoring part configured to check the presence or absence of a packet in the poll list upon being triggered by the timer interrupt to monitor the poll list; and a packet dequeuer configured to, when a packet has arrived, reference the packet held in the ring buffer, and perform dequeuing to remove the corresponding queue entry from the ring buffer.

Methods and systems for managing data transmissions are disclosed. An example method can comprise determining a plurality of time allocations for a time cycle. The plurality of time allocations can comprise a first time allocation which can be determined based on an information rate, a committed information rate, an excess information rate, an effective bandwidth rate, other factors, or a combination thereof. Data can be received from multiple sources into a buffer, for example, and can be processed within a time cycle if processing the data will not exceed the time allocation.

Systems and methods of performing rate limiting traffic shaping with a time-indexed data structure in a network device are provided. A network interface driver of the network device can received packets at the packet layer of a network host from a plurality of applications. The network interface driver can prevent one of the applications from sending additional packets for transmission until the application received a transmission completion notification indicating a packet previously forwarded to the packet layer of the network host has been transmitted. The network interface driver can process the received packets to determine a transmission time for each packet based on at least on rate limit policy. The network interface driver can store an identifier associated with the respective packet in a time-indexed data structure at a position associated with the transmission time determined for the packet. The network interface driver can determine that a time indexed in the time-indexed data structure has been reached and in response transmit a packet associated with the identifier stored in the time-indexed data structure at a position associated with the reached time. The network interface driver can communicate a transmission completion notification subsequent to the network interface driver transmitting the packet.

According to an embodiment, a transfer control device controls transfer of data stored in a communication device. The transfer control device includes a memory and one or more hardware processors electrically coupled to the memory and configured to function as a control unit, and a determining unit. The control unit performs control for transferring the data to a first transmission buffer. The determining unit determines, depending on a state of the communication device, data to be restricted from being transferred. When transfer is to be restricted, the control unit delays transfer of data to be restricted from being transferred.