What steps will reproduce the problem?
1. Ubuntu 3.13.0-32 x64 virtual machine running on ESXi 5.5, which is running
on a Dell R720 with a 2 port Intel X540-AT2 10Gig network card directly
attached to the VM with DirectPath I/O.
2. I have git cloned netmap and netmap-libpcap and built both successfully.
Downloaded tcpdump-4.6.2 and linked it to the netmap-libpcap, verified by:
./tcpdump -V
tcpdump version 4.6.2
libpcap version 1.6.0-PRE-GIT_2015_02_19
I have turned off flow control with:
ethtool -A eth1 autoneg off rx off
ethtool -A eth2 autoneg off rx off
3. In 1 terminal I run:
./pkt-gen -i eth1 -f tx -l 60 -S <mac of eth1> -D <mac of eth2> -n 500111222
In another terminal I run:
./tcpdump -ni eth2 -s 0 -w test.cap
What is the expected output? What do you see instead?
pkt-gen output averages around 7Mpps. During pkt-gen sending packets I
terminate the tcpdump process, and pkt-gen output changes to around 12Mpps
(around the limit for the ixgbe driver as I understand). The output of the
cancelled tcpdump command states lots of packets dropped by kernel and lots of
packets dropped by interface.
I would expect, for tcpdump linked with netmap-libpcap to drop minimal or no
packets.
Any help gratefully received.
Please provide any additional information below.
I run top during this process and pkt-gen cpu usage goes between 10-50%,
tcpdump is constantly around 70%.
Original issue reported on code.google.com by budede...@gmail.com on 19 Feb 2015 at 8:11
Original issue reported on code.google.com by
budede...@gmail.comon 19 Feb 2015 at 8:11