3.7 KiB
I recommend you to disable CPU freq scaling for gain max performance (max frequency):
echo performance | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
You can use script irq_balance_manually.sh for irq balancing on heavy loaded networks.
Running tool without root permissions:
useradd fastnetmon
setcap cap_net_admin+eip fastnetmon
su fastnetmon
./fastnetmon eth0,eth1
Please keep in mind when run tool on OpenVZ because without root permissions tool can't get all VE ips and you should pass it explicitly.
Debugging flags.
DUMP_ALL_PACKETS will enable all packets dumping to console. It's very useful for testing tool on non standard platforms.
DUMP_ALL_PACKETS=yes ./fastnetmon
Recommended configuration options for ixgbe Intel X540 driver (netmap mode):
cat /etc/modprobe.d/ixgbe.conf
options ixgbe IntMode=2,2 MQ=1,1 DCA=2,2 RSS=8,8 VMDQ=0,0 max_vfs=0,0 L2LBen=0,0 InterruptThrottleRate=1,1 FCoE=0,0 LRO=1,1 allow_unsupported_sfp=0,0
I got very big packet size (more than mtu) in attack log? In PF_RING this behaviour will be related with offload features of NIC. For INtel 82599 I recommend disable all offload:
ethtool -K eth0 gro off gso off tso off
How I can enable hardware filtration for Intel 82599 NIC? Install patched ixgbe driver from PF_RING distro and apply this patch to CMakeLists.txt and recompile tool:
add_definitions(-DHWFILTER_LOCKING)
How I can compile FastNetMon without PF_RING support?
cmake .. -DDISABLE_PF_RING_SUPPORT=ON
If you saw intel_idle in perf top with red higlihting you can disable it with following kernel params (more details you can find Performance_Tuning_Guide_for_Mellanox_Network_Adapters.pdf):
intel_idle.max_cstate=0 processor.max_cstate=1
If you want build with clang:
cmake -DCMAKE_C_COMPILER=/usr/bin/clang -DCMAKE_CXX_COMPILER=/usr/bin/clang++ ..
If tou want build tool with debug info:
cmake -DCMAKE_BUILD_TYPE=Debug ..
If you want speedup build process please build with ninja instead of make:
apt-get install -y ninja-build
cd build
cmake -GNinja ..
ninja
Ninja use all CPUs for build process:
1 [||||||||||||||||||||||||||||||||||||||||||||||100.0%] Tasks: 53, 103 thr, 64 kthr; 6 running
2 [||||||||||||||||||||||||||||||||||||||||||||||100.0%] Load average: 1.32 0.45 0.19
3 [||||||||||||||||||||||||||||||||||||||||||||||100.0%] Uptime: 1 day, 12:58:40
4 [||||||||||||||||||||||||||||||||||||||||||||||100.0%]
Build script for reading Netflow (v5, v9, ipfix) data from pcap dump:
cmake .. -DBUILD_PCAP_READER=ON
Run pcap data:
./fastnetmon_pcap_reader dump.pcap
Build script for running packet capture plugins without analyzer backend:
cmake .. -DBUILD_PLUGIN_RUNNER=ON
Examples for different plugins (plugin name could be netflow, netmap, sflow, pfring, pcap):
./fastnetmon_plugin_runner netflow
How to collect data for debugging netflow:
tcpdump -w /root/netflow_data.pcap -n 'udp dst port 2055'
How to collect data for debugging sFLOW:
tcpdump -w /root/sflow_data.pcap -n 'udp dst port 6343'
Performance tuning:
- Do not use short prefixes (lesser then /24)
- Do not use extremely big prefixes (/8, /16) because memory consumption will be very big
How I can enable ZC support for PF_RING? Please install DNA/ZC dreivers, load they and add interface name with zc prefix in config file (i.e. zc:eth3)
For development new code, please check .clang-format as code guide example.
You can find more info and graphics here