maximum ethernet speed

UDP speed near 5 MByte per second

TCP 1.2MByte per second (real data playload)

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http://www.niosforum.com/forum/index.php?a...st=0&#entry4398 (http://www.niosforum.com/forum/index.php?act=st&f=2&t=1048&st=0&#entry4398)[/b]

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Hi Major

I read your response about LWIP udp speed , which is about 5Mbits as you mentioned

Is there a demo program that you can refer me to test my udp bandwitch ?

thanks

Shay

5 MByte...ok sounds fine.

I need to transmit 400 - 600 MBit/s. Think its a long way to do that. Now I am working on a hardware implementation of an UDP Ethernet Frame Creator.

So I havent to use the slow stack.

I searched the inet...but I didnt found a ready-to-use implementation of that.

regards.

2 shay: 5 mbyte (not MBit) and it has been tested by "revolt".

I only check TCP effective data bandwidth.

May be anybody have same tested results for "OpenCores.org EMAC Development Package" (instead of LAN91C111)?

The EMAC package use a DMA channel for data transfer?

Another link about ethernet speed <div class='quotetop'>QUOTE </div>

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http://www.niosforum.com/forum/index.php?a...t=st&f=2&t=2169 (http://www.niosforum.com/forum/index.php?act=st&f=2&t=2169)[/b]

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400 - 600 Mbit/s. Thats a word. I think that is impossible via Ethernet.

I have a NIOS II @ 100 Mhz and the UDP checksum calulation in HW.

With this configuration I reached ~62 MBit/s transfer rate. I think with more

optimization 70-75 MBit/s should be possible with the 91C111.

kind regards

revolt

excuse me,How could you do the this job that measure the Ethernet speed??

Use any tool??

Or just write a socket program??

But the data could be written on the board??(in ram? in flash??)

I mean that when packet arrive from ethernet how could you do ?store it?? or??

Could anyone give me the source code for understand?

I wrote a little UDP Server (Windows) that measures the time for receiving a given amount of packets, e.g. 10000 UDP packets.

Parallel I used the Packetizer Ethernet Sniffer to check if the result is okay.

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But the data could be written on the board??(in ram? in flash??)

I mean that when packet arrive from ethernet how could you do ?store it?? or??

Could anyone give me the source code for understand?[/b]

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From which side are you talking? The NIOS II or PC side.

In my case I have a NIOS II and a PC connected via a crossover ethernet cable. The NIOS II only sends data to the PC and never receives packets form the server, expect ARP packets.

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originally posted by revolt@Sep 25 2005, 09:44 AM

400 - 600 mbit/s. thats a word. i think that is impossible via ethernet.<div align='right'><{post_snapback}> (index.php?act=findpost&pid=9947)

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The only time I&#39;ve seen that is with Gigabit Ethernet, transferring between GHz-class machines. Given that a Nios processor is usually 50-150 MHz, you&#39;d have to be transferring 4-12 bits per CPU clock cycle (!) to meet that data rate.

I&#39;ve been testing Ethernet throughput on my board (64MHz Cyclone Nios II w/ LAN91C111) and I get a TCP data rate (one way socket) of about 450kbytes/sec, and a UDP (TFTP upload) data rate of about 300kbytes/sec. I&#39;m running the eCos OS on my board (stock drivers), though, so I&#39;m not sure how much that hurts things. During transfers, the Ethernet pretty much eats the whole CPU (I can see a lowest-priority monitor task simply stopping for several seconds). I know for sure that I don&#39;t have any hardware checksum calculation. Are there any general guidelines on what to optimize to increase this speed?

I took a look at a 1000 MBit MAC IP from MorethanIP. They use a 4 bit MII Interface @ 25 MHz to transfer the data to the PHY. So the Interface has a limit from 12.5 MByte/s. I think GigaBit Ethernet is not fast enough.

Kind regards

revolt

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originally posted by revolt@Sep 25 2005, 09:44 AM

400 - 600 mbit/s. thats a word. i think that is impossible via ethernet.

i have a nios ii @ 100 mhz and the udp checksum calulation in hw.

with this configuration i reached ~62 mbit/s transfer rate. i think with more

optimization 70-75 mbit/s should be possible with the 91c111.

kind regards

revolt

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=9947)

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Hi Revolt,

you said you could reach a bitrate of ~62 MBit/s with UDP checksum in HW. How did you do this?!

Cheers,

Danny