[Solved] Pc to pc communication with straight cable cat6

What shall i do to achieve maximum speed with 1gbps??

If you are copying files between PC's, your hard drives are the limiting factor.

Actually i don't require file transfer. i need to transmit packets of size 1KB from my application to another application in other PC contineously which are connected directly. when i tested with my application i get only 80Mbps speed with 1gbps connection. So i tested with file transferring its giving around 100Mbps.
My application is written in delphi. what i have to consider to get maximum throughput?

Are 1K packets necessary? Those are kind of small. You may be better off with a larger packet size? Also, depending on which socket library you are using can make a difference. Are you using the standard indy controls that come with delphi? Also, what version of delphi are you using?

You didn't list your version of delphi or indy component. I think delphi 7 came with indy version 9 and delphi 2009 and higher have indy version 10. Indy version 9 had some problems that can be fixed with updates. You can download them from embarcadero's web site if you have an account. These were fixed in indy version 10. Sorry I can't be more specific. It's been a while since I've used the indy components.

I am using UDP protocol and non blocking socket.
I tested both senarios loop and waiting for acknowledgements. when i tested with acknowledgement senario its giving only 15Mbps speed, whereas without acknowledgement its giving around 65Mbps for 1gbps connection. Can u please explain how to manage the udp connection to get maximum throughput in delphi??

Thank you..

You say you are writing a file. I wonder if the disk i/o is slowing the transfer down. Is the file you are transferring small enough to capture in a TMemoryStream, then dump the memory stream to file once the transfer is complete? Other than that, the indy 10 components should be fine. Still, I would think you would get better than 15mbps. Also, if you have this code running in a thread, try bumping the thread's priority.

^+1

I agree. I just assumed the file was for testing purposes. If file transfer is the goal of the application then it should use TCP.

If those are your requirements, then you are being limited by them.

Do this: try using 2048, 4096, and finally 8192 size messages instead of 1024. What are your results now?

i think instead of using a component for communication, handling socket programming may improve the application performance..since calling component functions taking time for data sending or receiving. Thats why i started socket programming using winsock API im my application.. Is it correct approach or not? Please posr reply.. by that i can proceed further..

I have tested with 1000 packet sending using winsock API functions, here each packet size is 1024bytes. And also i have included multi thread concept in my application for data preparation and data sending (these two tasks are implemented in suparate threads which are using a same buffer, for that i used critical section concept). The performance throughput is 25Mbps (on average of 10 Tests). Is my approach is right for improving application performance as well as network performance??

Thank You..

A profiler would help. If AQTime comes with that version of delphi, use it.

My cable is 2meters of length..I think its not a cable problem..

TCP is always more reliable, but has more overhead. UDP is almost always used for streaming data, including video.

UDP provides an unreliable service and datagrams may arrive out of order, appear duplicated, or go missing without notice. UDP assumes that error checking and correction is either not necessary or performed in the application.

I've never worked with SCTP. Someone with more knowledge of this will need to answer this.

This topic has been closed by Mousemonkey