[Twisted-Python] UDP with multiple connections
george at ringdevelopment.com
Sun Oct 14 15:53:03 EDT 2007
On Thu, 2007-10-11 at 16:30 +0000, glyph at divmod.com wrote:
> On 03:20 pm, sipickles at hotmail.com wrote:
> >UDP is often used in online gaming, where other methods are employed to
> >compensate for its weaknesses, in return for its speed.
> "Speed" is an oversimplified way of explaining this usage.
> Some games use a TCP control channel for most logical messages and UDP
> for updates to a small set of values where only the _most current_ value
> ever matters. This is most often the position, orientation, and
> velocity of an object in the game world. This can improve the apparent
> performance of twitchy games over lossy links.
> Some games, having heard secondhand about this previous strategy, use
> UDP for everything because their implementors mistakenly believe that
> it's faster than TCP. Often, these games eventually switch to TCP later
> in the development cycle when networking bugs and profiling indicate
> that the features of TCP are actually required or the performance
> "gains" are actually losses. For example, routers on the public
> internet can and often do cheat in a variety of ways to use the
> additional information that TCP provides to make it go faster. UDP
> can't take advantage of that and its overall throughput is often slower
> (especially on congested networks).
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