BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  is it possible to increase transfer speed with UDP          BorlandTalk.com Forum Index -> Delphi Internet Winsock View previous topic :: View next topic   Author Message Eugene V. Goldberg Guest Posted: Wed Sep 17, 2003 12:34 pm    Post subject: is it possible to increase transfer speed with UDP Hey guys, Is it possible to increase data transfer rate using UDP between two hosts, lets say i know for sure that connection hardware speed is stable...Can i use custom integrity scheme to avoid waiting for packet confirmations etc? Any tips and links would be greatly appreciated. Thanx, Eugene. Back to top tcpip Guest Posted: Wed Sep 17, 2003 2:02 pm    Post subject: Re: is it possible to increase transfer speed with UDP If you do not care about loosing some data some times - definitly yes. rgds. "Eugene V. Goldberg" <egold (AT) mts-nn (DOT) ru> wrote Quote: Hey guys, Is it possible to increase data transfer rate using UDP between two hosts, lets say i know for sure that connection hardware speed is stable...Can i use custom integrity scheme to avoid waiting for packet confirmations etc? Any tips and links would be greatly appreciated. Thanx, Eugene. Back to top Francois Piette Guest Posted: Wed Sep 17, 2003 2:27 pm    Post subject: Re: is it possible to increase transfer speed with UDP Quote: Is it possible to increase data transfer rate using UDP between two hosts, lets say i know for sure that connection hardware speed is stable...Can i use custom integrity scheme to avoid waiting for packet confirmations etc? You will reinvent TCP... UDP is an unreliable protocol by design. If you need a reliable link, then use TCP or build your own error detection and correction system. Even with stable connection speed, you will loose UDP datagrams in high trafic situation, specially if you have a fast network and fast sending computer with slow receiving computer. You will also loose packets when you have different network segments with different speed. For example a GigabitThernet as backbone and FastEthernet to the user. -- Contribute to the SSL Effort. Visit http://overbyte.delphicenter.com/eng/ssl.html -- [email]francois.piette (AT) overbyte (DOT) be[/email] Author of ICS (Internet Component Suite, freeware) Author of MidWare (Multi-tier framework, freeware) http://www.overbyte.be Back to top Martin James Guest Posted: Wed Sep 17, 2003 4:43 pm    Post subject: Re: is it possible to increase transfer speed with UDP "Francois Piette" <francois.piette (AT) overbyte (DOT) be> wrote Quote: Is it possible to increase data transfer rate using UDP between two hosts, lets say i know for sure that connection hardware speed is stable...Can i use custom integrity scheme to avoid waiting for packet confirmations etc? You will reinvent TCP... IP is missing a reliable datagram protocol. TCP is fine if you have a byte stream, but sucks if you want to send a datagram-type structure. I wonder why such an obviously useful protocol was never included with IP? Wierd. Rgds, Martin Back to top tcpip Guest Posted: Wed Sep 17, 2003 5:09 pm    Post subject: Re: is it possible to increase transfer speed with UDP do not use it. there are plenty protocols much better, e.g. ipx or try ipv6 rgds Quote: IP is missing a reliable datagram protocol. TCP is fine if you have a byte stream, but sucks if you want to send a datagram-type structure. I wonder why such an obviously useful protocol was never included with IP? Wierd. Rgds, Martin Back to top Francois PIETTE Guest Posted: Wed Sep 17, 2003 6:00 pm    Post subject: Re: is it possible to increase transfer speed with UDP Quote: IP is missing a reliable datagram protocol. TCP is fine if you have a byte stream, but sucks if you want to send a datagram-type structure. There is no problem at all sending datagram-type structure. There are mainly two solutions: 1) Prefix your datagram with a byte count 2) Append a delimiter to your datagram, escaping this delimiter if present in the datagram Both solutions are easy to implement, specially with ICS and in anywase is much easier that implementing an eror detection and correction system with UDP. -- Contribute to the SSL Effort. Visit http://overbyte.delphicenter.com/eng/ssl.html -- [email]francois.piette (AT) overbyte (DOT) be[/email] The author for the freeware multi-tier middleware MidWare The author of the freeware Internet Component Suite (ICS) http://www.overbyte.be Back to top Remy Lebeau (TeamB) Guest Posted: Wed Sep 17, 2003 6:02 pm    Post subject: Re: is it possible to increase transfer speed with UDP "Martin James" <mjames_falcon (AT) dial (DOT) pipex.com> wrote Quote: TCP is fine if you have a byte stream, but sucks if you want to send a datagram-type structure. TCP works just fine for packet-based protocols as well as stream-based ones. Gambit --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system ([url]http://www.grisoft.com)[/url]. Version: 6.0.515 / Virus Database: 313 - Release Date: 9/1/03 Back to top Martin James Guest Posted: Wed Sep 17, 2003 6:44 pm    Post subject: Re: is it possible to increase transfer speed with UDP "Francois PIETTE" <francois.piette (AT) overbyte (DOT) be> wrote Quote: IP is missing a reliable datagram protocol. TCP is fine if you have a byte stream, but sucks if you want to send a datagram-type structure. There is no problem at all sending datagram-type structure. There are mainly two solutions: 1) Prefix your datagram with a byte count 2) Append a delimiter to your datagram, escaping this delimiter if present in the datagram Both solutions are easy to implement, specially with ICS Yeeess... ish. The 'solutions' above are another protocol on top of TCP on top of IP. I would like a reliable datagram protocol on top of IP so you don't have to enstream & destream your data to fit into TCP. The only obvious reason why there is no such IP protocol is that the Unix developers who thought up the protocols couldn't be bothered 'cos they were ony ever going to use 'readLn' anyway. and in anywase is Quote: much easier that implementing an eror detection and correction system with UDP. I agree on that one! Rgds, Martin Back to top Martin James Guest Posted: Wed Sep 17, 2003 6:46 pm    Post subject: Re: is it possible to increase transfer speed with UDP "Remy Lebeau (TeamB)" <gambit47 (AT) yahoo (DOT) com> wrote Quote: "Martin James" <mjames_falcon (AT) dial (DOT) pipex.com> wrote in message news:3f688eed (AT) newsgroups (DOT) borland.com... TCP is fine if you have a byte stream, but sucks if you want to send a datagram-type structure. TCP works just fine for packet-based protocols as well as stream-based ones. Exactly - 'packet-based protocols '. You need to have an application-layer streamer/destreamer to make it work. You cannot send a reliable datagram with TCP or UDP. Rgds, Martin Back to top SocketSlave Guest Posted: Fri Sep 19, 2003 2:24 pm    Post subject: Re: is it possible to increase transfer speed with UDP Isn't one of the best things about UDP the broadcast and multicast ability? I can see one tricky problem if you are going to create a reliable protocol that can do this and that is that you dont know how many people are listening to your broadcasts. So how will you decide when everyone has your datagram? "Martin James" <mjames_falcon (AT) dial (DOT) pipex.com> wrote Quote: "Remy Lebeau (TeamB)" <gambit47 (AT) yahoo (DOT) com> wrote in message news:3f68a189$1 (AT) newsgroups (DOT) borland.com... "Martin James" <mjames_falcon (AT) dial (DOT) pipex.com> wrote in message news:3f688eed (AT) newsgroups (DOT) borland.com... TCP is fine if you have a byte stream, but sucks if you want to send a datagram-type structure. TCP works just fine for packet-based protocols as well as stream-based ones. Exactly - 'packet-based protocols '. You need to have an application-layer streamer/destreamer to make it work. You cannot send a reliable datagram with TCP or UDP. 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