Hello,
 
I'm using zc with ixgbe and RSS enabled (40 queues, one for each core) and I have noticed the following behavior:
 
1. When I execute tcpdump -i zc:eth0@39 (last queue)  with no bpf-> I see no packets and the following in the summary stats:
 
0 packets captured
0 packets received by filter
101092 packets dropped by kernel
 
2. A similar behavior occurs when I execute: zc -i zc:eth0@39 :
 
Absolute stats: 0 pkts (12'293 drops) - 0 bytes
 
My question is: how come I can see drops in both tcpdump and zc's output but no actual packets ? what drops the packets and why ?
 
Thanks in advance,
 
Moshe
 
 
 
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