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Altera_Forum
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14 years ago

Ethernet roundtrip time with NicheStack & Nios-II

Hi, We are using TSE IP with NichStack, MicroC OS-II on Nios-II. FPGA is running a simple UDP host which echoes all packets it gets from client. The client is a PC running real-time OS and con...
Altera_Forum's avatar
Altera_Forum
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14 years ago

tens of ms seems a lot. A NicheStack/Nios II system isn't very fast, but it should be more than capable of sending more than 10 packets a second. What Ethernet hardware are you using? The driver could use a polling mode instead of interrupt, which could explain the long time before it gets a packet.

You could also use a profiler to see where the CPU is spending some time.

Other things to look into that can affect speed are the RAM interface, CPU cache (or lack of) and optimizations used during compiling (going from -O0 to -O2 has a significant impact).