----- Original Message ----- From: "Tim Dylla" <[email protected]> To: <[email protected]> Sent: Monday, September 07, 2009 4:01 AM Subject: [Winpcap-users] winpcap-app looses packets on full duplex GigabitEthernet connection
> Hi List, > > I'm trying to exchange Data between a PC and a DSP over Gigabit > Ethernet. Since it's a point-to-point connection and bandwidth is > critical I don't use any other Protocol than Ethernet frames. > The DSP is capable of utilizing the full bandwidth of a full duplex > Gigabit Connection, so there is a lot of traffic to be captured and sent. > On the PC I use WinPcap to capture and send raw Ethernet frames from/to > the DSP. Unfortunately, when I stress the Connection (sending and > receiving Packets at full bandwidth), packets get lost while capturing. > Interestingly, if I use Wireshark and let it write the captured packets > to disk, all packets get captured, but at the same time, some of them do > not show up in my little Winpcap-based app. > I use the pcap_loop() approach in a dedicated Thread and provide a -1 > for the amount of packets to capture (capture unless pcap_breakloop() is > called). Another Thread sends packet queues by subsequent calls of > pcap_sendqueue_transmit(). > To open the NIC-device I call pcap_open() with following flags: > PCAP_OPENFLAG_MAX_RESPONSIVENESS | PCAP_OPENFLAG_NOCAPTURE_LOCAL. > The packets have all the same Length of 1514 byte (incl. Etherframe > header). > > Does anyone know a better way to capture Ethernet frames > programmatically? Or can anyone give me a hint, how to avoid this problem? > I would avoid using PCAP_OPENFLAG_MAX_RESPONSIVENESS, it gives better responsiveness at the expense of a bigger cpu load, possibly causing packet losses. Also, which network card are you using? Have a nice day GV > Best, > > T. Dylla > > > _______________________________________________ > Winpcap-users mailing list > [email protected] > https://www.winpcap.org/mailman/listinfo/winpcap-users _______________________________________________ Winpcap-users mailing list [email protected] https://www.winpcap.org/mailman/listinfo/winpcap-users
