Q1: tough question to answer, as it depends on a number of factors. What is the average packet size? Are you just counting the packets, or dumping them to disk/DB/...? Do you see packet drops in the pcap_stats? Q2: I will need to run some tests on this. Do you have some minimal sample code that shows the issue? Q3: Yes, *if* the NIC (and NIC driver) are not dropping packets themselves.
Did you disable any protocol bound to the NIC where you receive all these packets? Have a nice day GV From: yulou liu Sent: Wednesday, August 25, 2010 11:08 AM To: winpcap Subject: [Winpcap-users] About the packets loss , what is the bottleneck ? 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! -------------------------------------------------------------------------------- _______________________________________________ Winpcap-users mailing list Winpcap-users@winpcap.org https://www.winpcap.org/mailman/listinfo/winpcap-users
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