![]() RFC 1122 specifies that the RTO should be calculated as outlined in. ![]() The duration of this timer is referred to as RTO (retransmission timeout). To end or quit the timer, one must use a cancel () function. Introduction The Transmission Control Protocol (TCP) uses a retransmission timer to ensure data delivery in the absence of any feedback from the remote data receiver. You can schedule a timed notification to occur according to a calendar schedule, at a specific time, after a duration of time, or at timed intervals. ![]() start () is a function that is used to initialize a timer. The timer service of the enterprise bean container enables you to schedule timed notifications for all types of enterprise beans except for stateful session beans. As mentioned before, when a sender decides to retransmits a packet, it indicates that the timeout has been reached (or what you called as "timeout has been finished"). After every specified number of seconds, a timer class function is called. You can however determine when it is 'finished' or more precisely, what behavior does a sender do after the timer/timeout has been reached. I'm just asking for what are indicating that a TCP timeout has been finished. So timeout is the time limit for the sender node to receive a reply from the destination node before retransmit the packet. This will cause the sender node to re-send/retransmit the packet. If a reply for the packet does not arrive within the timeout, the sender node will assume that a packet loss has occurred. When a node is sending a packet to another node (for example, using TCP), the sender node sets a timer for that packet to be replied. Before that, I will explain what is a timeout. Look closely at the picture and you will see that the timeout starts exactly as the packet is being transferred, not when it is loss.Ī node does not know the time of when a packet is loss (it is not possible). If the application desires to have finer control of event port allocationĪnd setup, it can use the rte_event_timer_adapter_create_ext() function.We can see that the timeout starts when the packet loss occur, but how long is the timeout? Is it until the specific packet has been delivered and acknowledged or when? Rte_event_timer_adapter_create() function will use a default method toĬonfigure an event port it will examine the current event deviceĬonfiguration, determine the next available port identifier number, and createĪ new event port with a default port configuration. Based on the eventĭevice capability, it might require creating an additional event port to be #define NSECPERSEC 1E9 const struct rte_event_timer_adapter_conf adapter_config = īefore creating an instance of a timer adapter, the application should createĪnd configure an event device along with its event ports. Code samples are abstracted andĪre based on the example of handling a TCP retransmission. Implementation manages timers using the DPDKĮxamples of using the API are presented in the API Overview and ![]() To determine which implementation should be used. Software implementations of the timer mechanism it will query an eventdev PMD The Event Timer Adapter library is designed to interface with hardware or ![]() The Event Timer Adapter library extends the event driven modelīy introducing a new type of event that representsĪ timer expiration, and providing an API with which adapters can be created orĭestroyed, and event timers can be armed and canceled. Such adapter it bridges event devices and timer mechanisms. New event sources by using event adapters. Event devices can be coupled with arbitrary components to provide Introduces an event driven programming model which presents applications withĪn alternative to the polling model traditionally used in DPDKĪpplications. ![]()
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