But - this computer can do memcpy at 80MB/s, so at 3.5MB/s it should be 5%
CPU for memcpy, and one interrupt per one packet (2500 packets/s).
Is something more that make it consume >50% CPU?
Accessing the on-card memory through PCI is guaranteed to be
slower than the main memory, and depending on the particular
card it may be much slower.
as comment say - this card do DMA to main memory then computer must copy.
so PCI speed needs just to be faster than 100Mbit/s, certainly is
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