Hi, Damien Can you please let me know the versions of your SW - pktgen-dpdk, DPDK and MLNX_OFED? Also Firmware version if available.
Thanks, Yongseok > On Sep 25, 2017, at 10:19 AM, Damien Clabaut <damien.clab...@corp.ovh.com> > wrote: > > Hello DPDK devs, > > I am sending this message here as I did not find a bugtracker on the website. > > If this is the wrong place, I would kindly apologize and ask you to redirect > me to the proper place, > > Thank you. > > Description of the issue: > > I am using pktgen-dpdk to replay a pcap file containing exactly 1 packet. > > The packet in question is generated using this Scapy command: > > pkt=(Ether(src="ec:0d:9a:37:d1:ab",dst="7c:fe:90:31:0d:52")/Dot1Q(vlan=2)/IP(dst="192.168.0.254")/UDP(sport=1020,dport=1021)/Raw(RandBin(size=8500))) > > The pcap is then replayed in pktgen-dpdk: > > ./app/app/x86_64-native-linuxapp-gcc/pktgen -l 0-7 -- -m [1-7].0 -s > 0:pcap/8500Bpp.pcap > > When I run this on a machine with Mellanox ConnectX-4 NIC (MCX4), the switch > towards which I generate traffic gets a strange behaviour > > #sh int et29/1 | i rate > 5 seconds input rate 39.4 Gbps (98.4% with framing overhead), 0 packets/sec > > A capture of this traffic (I used a monitor session to redirect all to a > different port, connected to a machine on which I ran tcpdump) gives me this: > > 19:04:50.210792 00:00:00:00:00:00 (oui Ethernet) > 00:00:00:00:00:00 (oui > Ethernet) Null Unnumbered, ef, Flags [Poll], length 1500 > 19:04:50.210795 00:00:00:00:00:00 (oui Ethernet) > 00:00:00:00:00:00 (oui > Ethernet) Null Unnumbered, ef, Flags [Poll], length 1500 > 19:04:50.210796 00:00:00:00:00:00 (oui Ethernet) > 00:00:00:00:00:00 (oui > Ethernet) Null Unnumbered, ef, Flags [Poll], length 1500 > 19:04:50.210797 00:00:00:00:00:00 (oui Ethernet) > 00:00:00:00:00:00 (oui > Ethernet) Null Unnumbered, ef, Flags [Poll], length 1500 > 19:04:50.210799 00:00:00:00:00:00 (oui Ethernet) > 00:00:00:00:00:00 (oui > Ethernet) Null Unnumbered, ef, Flags [Poll], length 1500 > > The issue cannot be reproduced if any of the following conditions is met: > > - Set the size in the Raw(RandBin()) to a value lower than 1500 > > - Send the packet from a Mellanox ConnectX-3 (MCX3) NIC (both machines are > indentical in terms of software). > > Is this a known problem ? > > I remain available for any question you may have. > > Regards, > > -- > Damien Clabaut > R&D vRouter > ovh.qc.ca >
