Re: regd network communication between RTLinux installed computers

Ethernet itself, in the MAC and physical layers can be realtime (after 
the destination ethernet address is determined) when used in a point to 
point application (i.e. two devices).  It can also be real-time if used 
in a multi-point application if the connecting switch supports real-time 
packet transmission.  Now, almost all ethernet applications use TCP/IP, 
which is not very real-time, although UDP packets can be real-time in 
certain cases (i.e. with fixed routing and some other considerations).  
TCP will never be real-time UNLESS your underlying packet loss is zero, 
in which case TCP is unneccesary.

Robert Kavaler


Kali Gaddam wrote:

>hi
>I have two computers with RTLinux installed and there is some data
>passing back and forth between these two computers in a closed loop.
>The linux user level programs are currently handling the data transfer
>through network. So if we want to have real time Communication, but
>Ethernet is not a real time protocol. Not sure of delay inherent in
>it. Did anybody face this situation, like you have to send certain
>packets with in certain time limit.
>how to decrease the delay in network
>how are
>
>  
>

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