raw socket bypassing tcp/ip headers

I have a 2 programs that are communicating via sockets on the same computer. Currently 1.6 million bytes is taking about 7 seconds to transfer using TCP/IP. I ne开发者_运维知识库ed to make it fast.

If I use a raw socket instead, and ignore the TCP/IP headers, then this should increase the speed? Is there anything else I can do to increase speed? Is the SOCKET_RAW option a straight copy or does it do anything else?

1.6MB shouldn't take 7 seconds using "normal" TCP/IP - certainly not on the same machine! That suggests you've got inefficient code somewhere. I'd address that before trying to do anything "special" in terms of the networking.

EDIT: I've just written a short C# program on a netbook, and that transfers 2MB (generating random data as it goes) in 279ms. That's with no optimization. Unless you're running on a machine from the 1980s, you should definitely be getting better performance than that...

Try using Unix Domain Sockets instead.

To get that poor of performance, you are doing something very inefficient. Perhaps the i/o operations are single byte?

Changing to raw sockets is a bad idea. To get reliable communication, you'd then have to add some sort of data checking, sequencing, etc., etc.: everything that TCP does for reliability.

If the purpose is to transfer data from one process to another on the same machine, use shared memory and a mutex to synchronize access. Of course this is not a good solution if the programs will eventually have to run on separate machines.

No, using raw IP sockets is definitely not a good idea. Using a unix-domain socket might be marginally more efficient, but I doubt it's going to solve your problem. You clearly have another problem. Perhaps it is your application-level protocol which is inefficient?