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Why would an application use udp instead of tcp

Because UDP is not using congestion control it can be both faster, and experience lower delay because it will not seek to maximize the buffers up to the dropping point, i.e. UDP packets are spending less time in buffers and get there faster with lower delay.

Why do we use the Linux kernel's TCP stack? | Hacker News

Browse other questions tagged networking tcp udp or ask your own question.But knowledge of when TCP might be the problem verse something else helps when your trying to solve that performance problem.

In general, you want the answer to be in one response packet, and you are prepared to implement your own protocol for reliability or to resend.Tips for London Public Transport for a first visit with a 3 year old.TCP does not guarantee delivery, it just guarantees that if it is able to deliver the packets they will be in the same order that they were sent.These buffers fill up to their capacity and packets are then dropped, and TCP notices this drop through the lack of a received acknowledgement, and throttles the speed of the connection to estimation of the capacity.An application can use UDP and can be reliable by using timeout and resend at.TCP re-orders packets so that data is delivered in the sent order.

Setup connections faster as there are no initial handshake to setup the connection.UDP is useful for broadcasting information in a publish-subscribe kind of application.Applications can use Transmission Control Protocol (TCP) and User Datagram Protocol (UDP).There are rarely any problems, but they do sometimes occur and so must be handled.The following knowledgebase explains why some services use both the protocols: TCP and UDP. So any application needs data to be transferred greater.Similar reasoning (UDP being faster than TCP in the mid-1980s along with a predominance of LANs over WANs) led the precursor of the DCE RPC package (the Apollo NCS package) to also choose UDP over TCP, although current implementations support both UDP and TCP.The numbers seemed to agree with what others have found in the past (UDP is about 5% faster in most situations).

Slow start and congestion avoidance—This is a form of flow control imposed by the sender to determine the current network capacity and to handle periods of congestion.

[Zookeeper-User] Why ZK uses TCP instead of UPD (IP

Official: Port is registered with IANA for the application. Unofficial: Port is not registered with IANA for the application.

Is the TCP protocol good enough for real-time multiplayer

Hence one generally prefers to tunnel TCP over UDP (or some other stateless protocol).This limits your application to only communicate with machines that it already knows about. UNIXguide.net.When is it better to prefer TCP instead of. always prefer TCP.

In fact, there are now user-land TCP stacks that can be used so that the application writer may have finer grained control over the resources needed for that TCP state.This becomes important if the latency exceeds the bandwidth, as described in Appendix A of TCPv3.It started out with IPX over 15 years ago with IP support added 13 years ago.With regard to Figure, UDP requires only two packets to exchange a request and a reply (assuming the size of each is less than the minimum MTU between the two end-systems).And then, you can use UDP to build your own TCP replacements, of.Multicast applications requiring reliable delivery have been built (e.g., multicast file transfer), but we must decide whether the performance gain in using multicasting (sending one packet to N destinations versus sending N copies of the packet across N TCP connections) outweighs the added complexity required within the application to provide reliable communications.

UDP is often harder in that you must write your program in such a way that it is not dependent on the accuracy of the packets.Even when packets are sent over very reliable links, such as in the core network, routers have limited size buffers.But if you get that udp packet it arrives with all the same bytes in the same order as it left, no changes.TCP has head-of-queue blocking, as it guarantees complete and in-order.

We have web service that has thousands of winforms client in as many PCs.

networking - what is type of ICMP packets? TCP or UDP

We discussed these two addressing modes in Chapters 20 and 21.

This is still an optimization, which should follow from actual testing.We should let the vendors focus on better TCP performance and concentrate our efforts on the application itself.

TCP versus UDP resilience to DDoS - Information Security

With TCP, you may feed the sending socket 300 Bytes, but the receiver only reads 100 Bytes and you have to figure out somehow that there 200 more Bytes on the way.The implementation of these two features requires that every TCP data segment contain a sequence number that can then be acknowledged.Stack Overflow is a community of 7.4 million programmers, just like you, helping each other.This is important if your application transmit fixed size messages, rather than a stream of bytes.In Sections 2.3 and 2.4, we described the major differences between UDP and TCP.For example, dropped segments might not need to be retransmitted for a real-time audio application, if the receiver can interpolate the missing data.