[JDEV] UDP vs TCP

[mark at mjwilcox.com]

We knew if we beat you long enough with a wet noodle, you'd learn 
=).

Just kidding. It was a very interesting discussion. 

Though if you're strictly looking at Linux and you still want to hack 
on your own transport, you might look at UNIX sockets. If you and I 
are on the same machine, that would be much more efficient than 
UDP or TCP.

Mark

On 3 Sep 00, at 23:28, Peter Donald wrote:

> At 02:12  1/9/00 -0400, you wrote:
> >It is true that for a long-lived connection, you have the chance of buffers
> >sitting empty for TCP connections, and being a substantial draw on system
> >resources. However, many systems (I can only assume Solaris, but know linux
> >as of 2.4) don't do this - they have a shared buffer space for all TCP
> >connections in the kernel.
> 
> Okay I checked this out with some people I consider with it and your right.
> TCP is getting a lot more efficient - thou not quite as efficient as UDP it
> is narrowing the boundary for lossless comms. I was told bluntly that in 2
> years UDP would be relatively worthless for lossless services and so I
> guess I should not do a UDP transport =)
> 
> There is a few other advantages especially with respect to low latency over
> relatively error free connections and TCP at the moment is only protocol
> that has compression between modem users and server. 
> 
> I can't honestly see *any* use for UDP in the future. I'm glad I posted
> here before I wasted time implementing it :P. While UDP may still be more
> efficient on some platforms linux is my target and thus my main concern and
> it is going to be very hard to beat it given some of the optimisations that
> will/have taken place.
> 
> 
> 
> 
> 
> Cheers,
> 
> Pete
> 
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Mark Wilcox
mark at mjwilcox.com
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