Are you transmitting and receiving from the same WinPcap-based application with the same pcap_t handle?
Have a nice day GV -------------------------------------------------- From: "Terence Neill" <[email protected]> Sent: Sunday, May 16, 2010 9:40 AM To: <[email protected]> Subject: [Winpcap-users] WinPcap performance > Hi folks, > > I'm doing some performance testing with WinPcap running under Windows > 7. My test setup is as follows: > > 1. Windows 7 PC (Q6600 4Gb RAM) and a Belkin RTL8169 based PCI GigE > network card. > 2. SmartBits 200 to generate and monitor traffic. > 3. The SmartBits is connected directly to the GigE network card using a > standard Cat5 cable. > 4. The SmartBits is indicating that the link is established as > Full-Duplex. > 5. I have two WinPcap processes running, one that transmits packets and > one that receives packets. > > When using Winpcap to transmit packets (1024 byte packets) using send > queues in batches of 255 packets, I'm finding that I can sustain a > transmit rate of 650Mbps (based on the network utilisation shown by > Windows) and no packets are lost. This is significantly more than I > need for the application that I have in mind, so no problem there. > > In the receive direction (with the SmartBits generating the traffic, > 1024 byte packets again), I'm finding that I can receive a stream at a > rate of around 200Mbps without WinPcap reporting any lost packets. > Again, this is well in excess of what I require for my application, so > no problem there. > > The problem that I'm seeing that if I try to support bi-directional > traffic (sending and receiving) then I can only sustain a transmit and > receive rate of around 15Mbps before WinPcap starts reporting packets > being dropped. > > To me, this looks like a problem with collisions, but as the GigE link > is reported as full duplex, I don't see how this could be the case. > > Is there anything obvious that I'm doing incorrectly? Any help would be > appreciated! > > Thanks, > > Terry > > > _______________________________________________ > 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
