Lasse Skov(deleted)
01/06/2009 4:39 AM
post19421
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Hey
We are trying to determine the best strategy for implementing a high speed
hard real-time ethernet protocol (EtherCAT master). We are considering
using io-pkt package filtering as the method for sending and receiving raw
EtherCAT packages (Ethernet packages with ethertype EtherCAT) which needs
to be transmitted at a higher frame rate than available from commercial
vendors as source code for QNX.
Is this possible (and reccomendable) using package filtering (or
alternatively bpf) under io-pkt, or should we go for a more "direct"
autonomous control of the standard NIC interface in order to reach sub
200us package frame rate?
The core networking documentation for io-pkt states that the ip-part is
tightly compiled into io-pkt. Does this mean that transmitting raw
EtherCAT frames without IP src and dst addresses will be impossible for us
using io-pkt?
The io-pkt is proberly not build for real-time communications, so maybe it is an argument for writing our own stack, and
not use the io-pkt.
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