I will take a look with netstat, but this is a headless embedded system - no graphical interface.
"Ronciak, John" <[email protected]> wrote: > -----Original Message----- > From: Jonathan Haws [mailto:[email protected]] > Sent: Friday, July 08, 2011 1:55 PM > To: [email protected] > Subject: [E1000-devel] e1000e driver missing first multicast message > from each data source > > I have seeing some very strange behavior with our e1000e driver. We > are trying to use this interface to capture high rate network data and > store it to disk. However, we seem to be dropping the very first > packet we get on each socket we create. > > It almost appears that the very first multicast datagram from any given > source is missing (our application listens on multiple ports to any > sources of data; anyone can send to these ports data that needs to be > logged and the application will log it; I seem to miss the first packet > from each source). Is that expected behavior? > > Our data are all UDP multicast datagrams on a local subnet, so we don't > have to worry about a message getting lost in routing or anything else. > What is bothering me is that ifconfig does not report any errors or > dropped packets, neither does ethtool. > > # ethtool -i eth0 > driver: e1000e > version: 1.3.10-k2 > firmware-version: 1.8-4 > bus-info: 0000:00:19.0 > > I know that the datagrams on the wire from the source - I have verified > that with Wireshark. However, my application code just never picks it > up. Once I get past these first missing packets, I do not miss another > packet - even at our 40 MB/s rates. > > Am I configuring my socket incorrectly? I can provide code if someone > thinks that may be an issue. Could there be a bug in the driver? I > can't see how that would be since I get every single packet after these > first ones. I am baffled at this! > > Thanks, > > Jonathan Hi Jonathan, So you know that the datagrams are on the wire but is the system seeing them? If you use Wireshark again on the receiving system you should see the packets arrive. If they do indeed arrive, then the NIC HW and driver are seeing the packets. This leave the stack that must be consuming the packets for some reason. If you use netstat to look at the stack statistics the packets will most likely show up there. Please take a look and let us know. Thanks, John ------------------------------------------------------------------------------ All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2d-c2 _______________________________________________ E1000-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
