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pktgen-dpdk.md

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Pktgen-dpdk

Build

  1. Install a recent DPDK release e.g.
git clone https://dpdk.org/git/dpdk
sudo rm -fr /usr/local/lib/x86_64-linux-gnu # DPDK changed a number of lib names and need to clean up
cd dpdk
git checkout v23.03
meson build
ninja -C build
sudo ninja -C build install
sudo ldconfig  # make sure ld.so is pointing new DPDK libraries
  1. Install the corresponding pktgen-dpdk 
git clone http://dpdk.org/git/apps/pktgen-dpdk
cd pktgen-dpdk
git checkout pktgen-23.03.0
make
or
make build    # Same as 'make'
or
make rebuild  # Rebuild Pktgen, which removes the Builddir then builds it again via meson/ninja
or
make rebuildlua # to enable Lua builds
or
make rebuildgui # to enable GUI builds with GTK

DPDK Configuration

  1. GRUB configuration:

    isolcpus=0-39 nohz_full=0-39 rcu_nocbs=0-39 intel_iommu=on iommu=pt
default_hugepagesz=1G hugepagesz=1G hugepages=80 intel_idle.max_cstate=0
processor.max_cstate=0 intel_pstate=disable rcu_nocb_poll audit=0

  2. Flow Control OFF: ethtool -A $netdev rx off tx off

  3. Memory optimizations:

    sysctl -w vm.zone_reclaim_mode=0
sysctl -w vm.swappiness=0

  4. Move all IRQs to far NUMA node: IRQBALANCE_BANNED_CPUS=$LOCAL_NUMA_CPUMAP irqbalance --oneshot

  5. Disable irqbalance: systemctl stop irqbalance

  6. Change PCI MaxReadReq to 1024B for each port of each NIC:

    setpci -s $PORT_PCI_ADDRESS 68.w # it will return 4 digits ABCD
setpci -s $PORT_PCI_ADDRESS 68.w=3BCD

  7. Set CQE COMPRESSION to AGGRESSIVE: mlxconfig -d $PORT_PCI_ADDRESS set CQE_COMPRESSION=1

  8. Disable Linux realtime throttling: echo -1 > /proc/sys/kernel/sched_rt_runtime_us

  9. Setup huge pages and hugetlbfs

    mkdir -p /mnt/huge
chmod 777 /mnt/huge
mount -t hugetlbfs nodev /mnt/huge

  10. Load vfio kernel modules by adding the following modules to /etc/modules:

    vfio
vfio_iommu_type1
vfio_pci
vfio_virqfd

    Then update-initramfs -u -k all.

  11. Reboot and check: dmesg | grep -e DMAR -e IOMMU -e AMD-Vi should display that IOMMU, Directed I/O or Interrupt Remapping is enabled, depending on hardware and kernel the exact message can vary.

    It is also important that the device(s) you want to pass through are in a separate IOMMU group. This can be checked with: find /sys/kernel/iommu_groups/ -type l

  12. Everything ok? Bind the device to DPDK drivers if needed. Mellanox PMD does not device binding.

    # set link down
ip link set dev enp2s0np0 down
python3 dpdk-devbind.py -b vfio-pci 02:00.0

Run

  1. Copy and edit the config file at scripts/cfg/pktgen-setup.sh to pktgen-dpdk/cfg
  2. Copy pktgen-40G to pktgen-dpdk
  3. Run tools/run.py in pktgen-dpdk