Hey, I've been trying to determine the performance of my application (ie, when does it start dropping packets). I am using the current version of libpcap in git, with Ubuntu 9.04 server (kernel 2.6.28-15-server). I am using the new pcap API calls to set the ring buffer to something like 2GB, and I'm reasonably sure that pcap compiles with mmap support enabled.
I noticed that when looking at the packet counts as reported by ifconfig, it agrees with the counts reported by my generator box, and in this particular instance it reports a handful of dropped packets. However, the number of packets my application processed is the number reported by ifconfig, but pcap_get_stats() does *not* report the number of dropped packets correctly. Traffic generator ifconfig: 41843935 inbound, 0 drops 27987584 outbound, 0 drops Application box ifconfig: 41843935 inbound, 1382 drops 27987584 outbound, 0 drops Application report via pcap_get_stats() 41842553 inbound, 0 drops 27987584 outbound, 0 drops Any thoughts on why this might be the case, and where I can find the bug? Dustin -- Innovation is just a problem away
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