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Old 07-27-2006, 12:07 PM   #1
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Intel NIC 82551 - slow UDP Packets w/ 2.6

I am trying to help find a solution for a customer.

He has tried various CPU Boards that have onboard INTEL 82551ER Ethernet chips.
Running under Linux 2.6, he is experiencing very slow UDP Packet updates - in the order of 500 per second. This is not fast enough for his NTP Server.

If he changes to a similar board using the REALTEK RTL 8139 chip, his UDP Packet speed increases to over 8000 per second.

This comparison has been done with a number of CPU's, so it is not CPU dependent.

He is using the INTEL LINUX DRIVER provided on the Intel website for the 82551ER chip.

Any thoughts or suggestions are welcome!

Thanks in advance.


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