Wireshark-dev: Re: [Wireshark-dev] High speed packet captures - libpcap with TPACKET_V3
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From: Jakub Zawadzki <darkjames-ws@xxxxxxxxxxxx>
Date: Sun, 10 Nov 2013 12:19:44 +0100
Hi,

On Sun, Nov 10, 2013 at 11:50:27AM +0100, Anders Broman wrote:
> The upcoming libpcap 1.5 have support for TPACKET_V3 which seems to 
> improve on packet drops at high sped captures.

Finally ;-)

> However some tests on a 1 Gb link with ~900 Mb/s indicates that tcpdump does better than dumpcap
> possibly because dumpcap uses "inpkts = pcap_dispatch(pcap_opts->pcap_h, 
> 1, capture_loop_write_packet_cb, (u_char *)pcap_opts);"  fetching 
> packets one by one rather than using -1.

Try saving in libpcap (not libpcap-ng) format, try to use threads (or not if you were using them).
Does it helps?