DPDK & Openstack why?Team 3

Why? Too many logical devices make “Latency” “Latency”

“Latency”. Hypervisor wasn’t designated to support network

functions! Device service routine works with Interrupt!

Linux BridgeOVS Bridge

Namespace

Tap Device

EncapsulationDVR

Neutron NodeOVS Tunnel Bridge

External Bridge

Bottleneck ?

NetworkingApplication #2

NetworkingApplication #1

LPC? TCP? UDP? That’s ok. I assume it just “mem copy”.

Software Interrupt

Bottleneck ?

NIC : Buffer

KernelDeviceDriver

Interrupt > Interrupt Service Routine > DPC

NetworkingApplication

APC > Networking Application

Interrupt

DPDK? Data Plan Developer Kit DPDK is a set of software libraries and Ethernet drivers (native and

virtualized) that run in Linux user space to boost packet processing

throughput on Intel® architecture.

Support

Investment!

Proof of concept

Hardware : IBM PureFlex Spec Host - 16core / 256G / 10g nic * 2eaGuest – 8core / 32G / virtio nic * 2ea => CPU Socket Isolation & NUMA

• Software Iperfdpdk-ovsvirtio-net-pmd

Proof of concept

Host

Guest

KVM KVMdpdk-ovs

virtio-net-pmd

Guest

virtio-net-pmd

Iperf server Iperf client

Conclusion

non with DPDK0

5000100001500020000250003000035000

intr/sec

Bridge OVS OVS with DPDK

0102030

Gbps/sec

cpu usage

Iperf server

Self-reflec-tion

Something strange..

causeShort TimeSide effectLow experience

Anyway… PMD = “Poll Mode Driver”

Accelerationfeatures

SR-IOV VMQ / DVMQ RSS / vRSS Jumbo Frame Large Send Offload Checksum Offload RDMA DCB Datacenter TCP (ECN) RSC (Receive Segment Coalescing) NVGRE/VXLAN offload

Thank you