is RTL8139 THAT bad?

i have pentium 200 with that card. doing ftp from other machine, getting
3.5MB/s (HDD can 10MB/s, DMA) having 45%-55% interrupt load.

when sending it's not that bad.

tried writing file to disk with cat /dev/zero >file, it's only 3% ints
with 10MB/s traffic.


Why it's THAT bad?

3.5MB/s is less that 2500 packets/second. 50% at 200Mhz means 100000000
cycles spend on interrupt service, which is 40000 CPU cycles per packet.

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