[Winpcap-users] About the packets loss , what is the bottleneck ?

[yulou liu]

I'm using winpcap to capture datas from FPGA board via 1G Ethernet
connection(directly connected).
the FPGA is configed to send data at a special rate. With the fpga sending
rate increases,especially above 500Mbps, it sometimes loss packets.

Q1:  Is it possible to totally avoid packets loss by optimism the code?  I
want to collect datas at speed 614Mbps without packet loss (collecting all
datas

last about 1 minutes). My workstations features with 2 Xeon CPU (each has
4core), DDR3 SDRAM, 1 G onboard  netcard.  Which part is the most probably
bottleneck ?

Q2: As a test ,  I found the pcap_next_ex() can't get any packets  when the
user buffer is set over 64 MB,  what does it happen ?

Q3: if the Kernel buffer's size is 16MB , then the first 16Mb packets from
fpga won't be lost,  so ,  if I set the kernel buffer as 128MB ,  then at
least

the first coming 128MB data from FPGA won't be lost either ?  but I found
When I set the kernel buffer bigger than 100 MB, the packets drops is
getting

worse.


Thanks a lot!
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