[Pandora] about MMAP_PACKET and drops

[uaca]

Hi Simon

please, see the following log, it's about drops 

pcap: Trying enough memory for 41943040 bytes 
pcap: Got memory for 41943040 bytes 
tcpdump: listening on atm0

54097 packets received by filter
1085 packets dropped by kernel
1781 packets received by filter
0 packets dropped by kernel
1776 packets received by filter
0 packets dropped by kernel
1455 packets received by filter
0 packets dropped by kernel
1421 packets received by filter
0 packets dropped by kernel

I have repeated this test several times all times with the same results

I describe the test:

I modified your lib to get 40MB of buffer (ct= ct*10), this is for making
sure I have enogh space to buffer 1 second at interface data rate

and then I make the same test I described in the text I sent to you:

sleep 10 seconds, then 

kill -INT 

        got:

        54097 packets received by filter
        1085 packets dropped by kernel

nanosleep 250ms, kill -INT again

        got:

        1781 packets received by filter
        0 packets dropped by kernel

nanosleep 250ms again, kill -INT

        got:

        1776 packets received by filter
        0 packets dropped by kernel
        
nanosleep 250ms again, kill -INT

        got:

        1455 packets received by filter
        0 packets dropped by kernel

nanosleep 250ms again, kill -INT

        got:

        1421 packets received by filter
        0 packets dropped by kernel

The tests were made using tcpdump, without calling the callback function.
(that prints everything)

any clue what the initial drops? It shouldn't be there

        Ulisses

        
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