October 2001
- (no subject) J C Lawrence
- Lum the Mad is closing--sort of Koster, Raph
- Questing (was: Request for ideas) Eli Stevens
- Questing (was: Request for ideas) Joe Andrieu
- Questing (was: Request for ideas) Matt Mihaly
- Questing (was: Request for ideas) Sellers, Mike
- Questing (was: Request for ideas) Vincent Archer
- contract games/markets (was: Request for ideas) Bruce Mitchener
- DEV: Peer-to-Peer MUD Phil O'Donnell
- DEV: Peer-to-Peer MUD Dan MacDonald
- DEV: Peer-to-Peer MUD Robin Lee Powell
- DEV: Peer-to-Peer MUD Justin Rogers
- DEV: Peer-to-Peer MUD Adam Martin
- DEV: Peer-to-Peer MUD Frank Crowell
- Psychology and game design (Was Geometric content generation) John Hopson
- Psychology and game design (Was Geometric content generation) Ola Fosheim Grøstad
- Psychology and game design (Was Geometric content generation) Dave Rickey
- Psychology and game design (Was Geometric content generation) Ola Fosheim Grøstad
- Psychology and game design (Was Geometric content generation) Matt Mihaly
- Psychology and game design (Was Geometric content generation) Ola Fosheim Grøstad
- Psychology and game design (Was Geometric content generation) rayzam
- in-game vs web-based boards (was: Geometric content generation) Freeman, Jeff
- State of the RP: Verant's attempt at a RP Server Eric Rhea
- New MMP Networking Architecture Lee Sheldon
- New MMP Networking Architecture Adam Martin
- New MMP Networking Architecture Bruce Mitchener
- New MMP Networking Architecture Ling Lo
- New MMP Networking Architecture Norman Nunley, Jr.
- Mucking about in time Eli Stevens
- Mucking about in time Travis Casey
- Mucking about in time Adam Martin
- Mucking about in time John Robert Arras
- Many MUDs in one? (was: Geometric content generation) Ian Collyer
- Many MUDs in one? (was: Geometric content generation) Matt Mihaly
- Many MUDs in one? (was: Geometric content generation) Robin Lee Powell
- Pueblo still kicking Jon Lambert
- FWD: Call for papers: AAAI symposium on AI and Interactive Entertainment Robert Zubek
- Game Theory Introduction Ling Lo
- MUD-Dev digest, Vol 1 #438 - 22 msgs Phil O'Donnell
- Uniqueness of Games Adam Martin
- Uniqueness of Games Ling Lo
- Psychology & Player Motivation (was Geometric Content Generation) Sasha Hart
- Simulation, just how much? (was: Uniqueness of Games) Derek Licciardi
- Laws of Competition Matt Mihaly
- UDP Revisted Daniel.Harman@barclayscapital.com
- UDP Revisted Brian Hook
- UDP Revisted Bobby Martin
- UDP Revisted Brian Hook
- UDP Revisted Dave Rickey
- UDP Revisted Daniel.Harman@barclayscapital.com
- UDP Revisted Dave Rickey
- UDP Revisted Travis Nixon
- UDP Revisted Amanda Walker
- UDP Revisted Brian Hook
- UDP Revisted Ben Greear
- UDP Revisted amanda@alfar.com
- UDP Revisted Brian Hook
- UDP Revisted Travis Nixon
- UDP Revisted Daniel.Harman@barclayscapital.com
- UDP Revisted Travis Nixon
- UDP Revisted David H. Loeser Jr.
From: "Travis Nixon" <tnixon@avalanchesoftware.com>
> Er, then I truly do not understand why you don't just use TCP.
> Good point about the chat messages though.
> If you've implemented ALL the features of TCP though, then why
> aren't you just using TCP? Brian mentioned sync issues, but
> there's no reason that TCP packets and UDP packets couldn't get
> put into a single container based on timestamp. And most of the
> sync issues are caused by the in-order requirement anyway, I'd
> think.
> Unless, of course, you've looked at the TCP implementation,
> decided it sucked, and thought you could do better. That's
> certainly a valid reason. But if you implement all the same
> features, you have all the same problems.
> Not criticizing, just trying to understand. :)
Basically the difference between TCP and UDP are:
(I presume that you know or at least have a basic knowledge of
this but I post it for completeness)
TCP is of course connection oriented and TCP provides all the
reliability necessary for two (or more) machines to communicate
across the internet. TCP verifies that the data arrives, and
automatically retransmits segments that do not arrive. TCP computes
a checksum over the data to guarantee that the data was not
corrupted during transmission. It uses sequence numbers to ensure
that the data arrives in order, and automatically eliminates
duplicate packets. TCP provides flow control to ensure that the
sender does not transmit data faster than the receiver can consume
it. Finally, TCP informs both the client and server if the
underlying network becomes inoperable for any reason.
UDP is connectionless and there are no guarantees that the data is
delivered. When UDP sends data, it may be lost, duplicated, delayed
or delivered out of order, from both server and client (or client to
client).
Underneath all of the above is the actual implementation of each
protocol. TCP has four output states, IDLE, TRANSMIT, PERSIST,
RETRANSMIT. The state machine for input has numerous states, CLOSED,
LISTEN, SYN SENT, SYN RCVD, ESTABLISHED, CLOSE WAIT, LAST ACK, FIN
WAIT-1, CLOSING, TIME WAIT, FIN WAIT-2 and they are
interconnected. I tried to find a state machine for UDP... couldn't
find anything similar to what I located for TCP - so I can't compare
the state machines for the implementation of the protocols. I did
find an interesting chart that graphed the total lines of code that
were used to implement each major protocol as a percentage of the
total. Here are some comparison numbers:
PROTOCOL %LINES %FUNCTIONS
TCP 20.7% 22.3%
SNMP 19.2% 19.6%
OSPF 14.4% 14.4%
IP 12.0% 13.6%
ICMP 3.1% 2.2%
RIP 3.2% 3.3%
UDP 2.5% 2.2%
The Summary of this text (Internetworking with TCP/IP second edition
volume 2 ISBN:0-13-125527-4, Comer, Stevens) reads like this: An
analysis of the code provides few surprises. As expected, TCP
requires the most code because it provides the most services and
handles the most problems....
I take the old adage that as a game programmer, I can write linked
list code that will be faster and take up less memory than that
canned list class that comes with the compiler (is my age showing,
anyone remember writing 6502 assembly and searching for one free
byte to use?). My (albeit elitist/programmers ego) attitude about
TCP -vs.- UDP is inline with just that kind of thinking -- I will
implement my own sequencing and by the way make it reliable
guaranteeing that the data arrives ect...
Additionally, a quick look check of the MORPGs that have tried to
utilize TCP and haven't had much success in terms of server response
(or player enjoyment) and had to drop back and punt or retrofit,
should be enough of a reason to decide against TCP.
Hope that is helpful... it's nearly 2:AM and I'm out of Dew so I'm
finished -
Good Luck,
David "Dak Lozar" Loeser - UDP Revisted Adam Martin
- UDP Revisted Bobby Martin
- UDP Revisted David H. Loeser Jr.
- UDP Revisted Bobby Martin
- UDP Revisted Kwon Ekstrom
- UDP Revisted Bruce Mitchener
- UDP Revisted Bobby Martin
- UDP Revisted Bruce Mitchener
- UDP Revisted Daniel.Harman@barclayscapital.com
- Procedural content generation Brian Hook
- Procedural content generation John Buehler
- Procedural content generation Brian Hook
- Procedural content generation John Buehler
- Procedural content generation Hans-Henrik Staerfeldt
- Procedural content generation lhulbert@hotmail.com
- Procedural content generation Travis Nixon
- Procedural content generation Ola Fosheim Grøstad
- Procedural content generation Daniel.Harman@barclayscapital.com
- Procedural content generation Daniel.Harman@barclayscapital.com
- Procedural content generation Freeman, Jeff
- Procedural content generation Matt Mihaly
- Procedural content generation Ola Fosheim Grøstad
- Simulation, Christopher Allen
- Simulation, Travis Casey
- MMORPG Comparison (UO, EQ, AC, AO, DAoC) Dave Kennerly
- MMORPG Comparison (UO, EQ, AC, AO, DAoC) Robin Lee Powell
- MMORPG Comparison (UO, EQ, AC, AO, DAoC) Dave Rickey
- MMORPG Comparison (UO, EQ, AC, AO, DAoC) John Buehler
- MMORPG Comparison (UO, EQ, AC, AO, DAoC) Dave Rickey
- MMORPG Comparison (UO, EQ, AC, AO, DAoC) John Buehler
- MMORPG Comparison (UO, EQ, AC, AO, DAoC) Brian Hook
- MMORPG Comparison (UO, EQ, AC, AO, DAoC) John Buehler
- MMORPG Comparison (UO, EQ, AC, AO, DAoC) Daniel.Harman@barclayscapital.com
- MMORPG Comparison (UO, EQ, AC, AO, DAoC) Vincent Archer
- MMORPG Comparison (UO, EQ, AC, AO, DAoC) Derek Licciardi
- MMORPG Comparison (UO, EQ, AC, AO, DAoC) John Buehler
- MMORPG Comparison (UO, EQ, AC, AO, DAoC) Dave Rickey
- MMORPG Comparison (UO, EQ, AC, AO, DAoC) Dan Burke
- Simulation, Adam Martin
- UDP Revisited Daniel.Harman@barclayscapital.com
- UDP Revisited Brian Hook
- UDP Revisited Mats Lidstrom
- UDP Revisited Jeremy Gaffney
- Simulation Revisited Dave Rickey
- TCP Vegas Adam Martin
- Procedural content generation, randomness Adam Martin
- Procedural content generation, randomness Brian Hook
- Content authorship Adam Martin
- Content authorship Ola Fosheim Grøstad
- Content authorship Travis Casey
- DAoC dev team (was: MMORPG Comparison (UO, EQ, AC, AO, DAoC)) Eli Stevens
- DAoC dev team (was: MMORPG Comparison (UO, EQ, AC, AO, DAoC)) Dave Rickey
- DAoC dev team (was: MMORPG Comparison (UO, EQ, AC, AO, DAoC)) Ola Fosheim Grøstad
- DAoC dev team (was: MMORPG Comparison (UO, EQ, AC, AO, DAoC)) Robin Lee Powell
- DAoC dev team (was: MMORPG Comparison (UO, EQ, AC, AO, DAoC)) Brian Hook
- DAoC dev team (was: MMORPG Comparison (UO, EQ, AC, AO, DAoC)) Daniel.Harman@barclayscapital.com
- DAoC dev team (was: MMORPG Comparison (UO, EQ, AC, AO, DAoC)) Neufeld, Don
- DAoC dev team (was: MMORPG Comparison (UO, EQ, AC, AO, DAoC)) Brian Hook
- DAoC dev team Dave Rickey
- SSL vs. SASL (was: UDP Revisted) Bruce Mitchener
- MUD-Dev digest, Vol 1 #445 - 27 msgs Paul Schwanz
- MUD-Dev digest, Vol 1 #445 - 27 msgs Travis Nixon
- Proposed Law John Buehler
- Proposed Law Matt Mihaly
- Proposed Law John Buehler
- Proposed Law Freeman, Jeff
- Proposed Law John Buehler
- Proposed Law Matt Mihaly
- Proposed Law John Buehler
- Proposed Law Matt Mihaly
- Proposed Law John Buehler
- Proposed Law Matt Mihaly
- Proposed Law Koster, Raph
- Proposed Law Matt Mihaly
- Proposed Law John Buehler
- Proposed Law Koster, Raph
- Proposed Law Ola Fosheim Grøstad
- Proposed Law Jon Lambert
- Proposed Law Paul Schwanz
- Proposed Law Matt Mihaly
- Proposed Law Paul Schwanz
- Proposed Law Paul Schwanz
- Proposed Law Madman Across the Water
- Proposed Law Travis Nixon
- Proposed Law Mark Eaton
- Proposed Law Sami Kosonen
- Proposed Law Madman Across the Water
- Proposed Law Andrew Hefford {Coregen}
- Proposed Law Dan Burke
- Proposed Law Matt Mihaly
- Proposed Law John Buehler
- Proposed Law Matt Mihaly
- Proposed Law Paul Schwanz
- Proposed Law Ian Collyer
- Proposed Law Matthew Estes
- Proposed Law Matt Mihaly
- Proposed Law Ola Fosheim Grøstad
- Proposed Law John Buehler
- Proposed Law Ola Fosheim Grøstad
- Proposed Law John Buehler
- Proposed Law Adam Martin
- Proposed Law Matt Mihaly
- Proposed Law Adam Martin
- Proposed Law Matt Mihaly
- Proposed Law Paul Schwanz
- Quality Testing Michael Tresca
- Quality Testing John Buehler
- Quality Testing Michael Tresca
- Quality Testing Dave Rickey
- Quality Testing Nathan F. Yospe
- Quality Testing Michael Tresca
- Quality Testing Koster, Raph
- Quality Testing Dave Rickey
- Quality Testing Dave Rickey
- Quality Testing Derek Licciardi
- Quality Testing Dave Rickey
- Quality Testing Michael Tresca
- Quality Testing Dave Rickey
- Quality Testing Jeff Cole
- Quality Testing Robin Lee Powell
- Quality Testing Daniel.Harman@barclayscapital.com
- Quality Testing J C Lawrence
- Quality Testing Daniel.Harman@barclayscapital.com
- Quality Testing Dave Rickey
- Quality Testing Daniel.Harman@barclayscapital.com
- Quality Testing Michael Tresca
- Quality Testing Daniel.Harman@barclayscapital.com
- Quality Testing Paul Dahlke
- Quality Testing Dave Rickey
- Players Controlling Monsters rayzam
- High Level Architecture Adam Martin
- Networking architecture overview Brian Hook
- Networking architecture overview Dave Rickey
- Networking architecture overview Brian Hook
- Networking architecture overview Amanda Walker
- Networking architecture overview Brian Hook
- Networking architecture overview Bobby Martin
- Networking architecture overview Daniel.Harman@barclayscapital.com
- Connection Stats Ben Tolputt
- MUD-Dev digest, Vol 1 #443 - 12 msgs Dr. Cat
- Fourteen forms of fun Ola Fosheim Grøstad
- Fourteen forms of fun rayzam
- Fourteen forms of fun Sasha Hart
- Fourteen forms of fun Jon Lambert
- Fourteen forms of fun David H. Loeser Jr.
- Fourteen forms of fun Matt Mihaly
- Fourteen forms of fun Ola Fosheim Grøstad
- Incorporating Plot/Backstory/Scenario Design Tools Nathan F. Yospe
- Extreme Programing Ling Lo
- DAoC dev team Lars Duening
- Documentation Adam Martin
- Documentation Brian Hook
- English grammar thoughts Par Winzell
- English grammar thoughts Kylotan
- English grammar thoughts Travis Casey
- English grammar thoughts Jasper McChesney
- English grammar thoughts Marian Griffith
- English grammar thoughts Travis Casey
- English grammar thoughts Jasper McChesney
- English grammar thoughts bruce@puremagic.com
- English grammar thoughts Marian Griffith
- English grammar thoughts Travis Casey
- English grammar thoughts Robert Zubek
- English grammar thoughts Robert Zubek
- English grammar thoughts Travis Casey
- English grammar thoughts Chris Gray
- English grammar thoughts Jon Leonard
- ADMIN: The code documenting/commenting thread J C Lawrence
- Players Controlling Monsters David H. Loeser Jr.
- Players Controlling Monsters Brian Hook
- Players Controlling Monsters John Buehler
- Expectations of in-game reality Matt Mihaly
- Expectations of in-game reality Freeman, Jeff
- Expectations of in-game reality J C Lawrence
- Expectations of in-game reality Freeman, Jeff
- Expectations of in-game reality Travis Casey
- Expectations of in-game reality Lars Duening
- Expectations of in-game reality Marian Griffith
- Expectations of in-game reality Derek Licciardi
- Expectations of in-game reality Lars Duening
- Expectations of in-game reality Paul Schwanz
- Expectations of in-game reality Nip
- Expectations of in-game reality Ian Collyer
- Expectations of in-game reality Adam Martin
- Expectations of in-game reality Michael Tresca
- Expectations of in-game reality J C Lawrence
- Expectations of in-game reality Matt Mihaly
- Expectations of in-game reality Daniel.Harman@barclayscapital.com
- Expectations of in-game reality Eli Stevens
- Expectations of in-game reality Marian Griffith
- Expectations of in-game reality Travis Casey
- Expectations of in-game reality Sami Kosonen
- Respecting NPCs Lee Sheldon
- Respecting NPCs J C Lawrence
- Respecting NPCs Lee Sheldon
- Respecting NPCs J C Lawrence
- Respecting NPCs Sami Kosonen
- Respecting NPCs Travis Nixon
- Respecting NPCs Matthew Estes
- Respecting NPCs Chris Gray
- Respecting NPCs Michael Tresca
- Respecting NPCs Freeman, Jeff
- Respecting NPCs Michael Tresca
- Respecting NPCs Freeman, Jeff
- Respecting NPCs Travis Nixon
- Respecting NPCs Michael Tresca
- Respecting NPCs Adam Martin
- Respecting NPCs Michael Tresca
- Respecting NPCs Daniel.Harman@barclayscapital.com
- Respecting NPCs rayzam
- Respecting NPCs Joe Andrieu
- Respecting NPCs Bruce Mitchener
- Respecting NPCs Joe Andrieu
- Respecting NPCs Michael Tresca
- Respecting NPCs Adam Martin
- Respecting NPCs Lee Sheldon
- Respecting NPCs T.A.J.BARTON
- Respecting NPCs Bruce Mitchener
- Respecting NPCs Adam Martin
- Respecting NPCs Madman Across the Water
- Respecting NPCs Travis Nixon
- Respecting NPCs J C Lawrence
- Respecting NPCs John Buehler
- Respecting NPCs lazarus@ourplace.org
- Respecting NPCs Colin Coghill
- Respecting NPCs gamaiun@yahoo.com
- Respecting NPCs J C Lawrence
- Respecting NPCs Phillip Lenhardt
- Respecting NPCs gamaiun@yahoo.com
- Respecting NPCs Ola Fosheim Grøstad
- Respecting NPCs J C Lawrence
- Respecting NPCs Ola Fosheim Grøstad
- Respecting NPCs Bruce Mitchener
- Respecting NPCs Norman Nunley, Jr.
- Respecting NPCs J C Lawrence
- Respecting NPCs Brian Hook
- Respecting NPCs J C Lawrence
- Respecting NPCs gamaiun@yahoo.com
- Respecting NPCs Ola Fosheim Grøstad
- Respecting NPCs Matthew D. Fuller
- Respecting NPCs Timothy Dang
- Respecting NPCs gamaiun@yahoo.com
- TECH : RMI (was UDP Revisted) Daniel.Harman@barclayscapital.com
- TECH : RMI (was UDP Revisted) Bobby Martin
- Chatbots Adam Martin
- TECH: UDP Revisted Bobby Martin
- The function of NPCs in novels versus MUDs Ola Fosheim Grøstad
- RE: Koster, Raph
- RE: Joe Andrieu
- RE: Marian Griffith
- RE: gamaiun@yahoo.com
- RE: Daniel.Harman@barclayscapital.com
- Violence Matt Mihaly
- Quality Testing (and community) Ola Fosheim Grøstad
- ADMIN: Recent outages J C Lawrence
- [ECOSYSTEMS] Fishing in the real world Adam Martin
- [ECOSYSTEMS] Fishing in the real world Daniel.Harman@barclayscapital.com
- [ECOSYSTEMS] Fishing in the real world Hans-Henrik Staerfeldt
- [ECOSYSTEMS] Fishing in the real world Ian Collyer
- [ECOSYSTEMS] Fishing in the real world Dave Rickey
- Statistics Ben Chambers
- Statistics Eli Stevens
- Statistics Adam Martin
- Statistics Hans-Henrik Staerfeldt
- Statistics John Buehler
- Statistics Ben Chambers
- Statistics Ben Chambers
- Statistics Travis Casey