1. Towards a single virtualized data path for VPP
Zhihong Wang – Intel
FD.io Mini Summit – Seattle – 2016

2. Outline
Background Features, performance Integration

3. Background Why virtio ring? Standard spec. High performance
Virtual Appliance
Host Kernel
vSwitch or
vRouter
Virtual Appliance
Virtual Appliance
Why virtio ring?
Standard spec.
High performance
Bypass kernel
Share memory based
Smart notification
Cache friendly
Continuously evolving
Secure

4. A single Vhost 1 + 1 + … = 1 2 Vhost in VPP
DPDK
VPP
OVS
Contrail
BESS
Lagopus
2 Vhost in VPP
Historically, VPP has a stock Vhost-user
Unified PMD for Vhost in DPDK
Desire: A single Vhost
Development/optimization convergence
Lower maintenance effort
Better usability
… = 1

5. DPDK Vhost evolution Feature support
Reconnect, live migration, offloading, multiqueue…
Performance optimization: Design + Implementation
Reaching the maximum throughput for 0.95/1.0
Cache access: Batching, avoid RFO bubbles…
Virtio 1.1
New ring layout
Rings, descs, …
Virtio core
R/W
Vhost core
R/W
“Simple can be harder than complex.”
― Steve Jobs

6. Performance
VPP xconnect between NIC and a Vhost port On a Haswell server
DPDK Vhost is faster
12%
35%
30%
28%
23% 8%
12%
21%
15% 5%
Based on upcoming DPDK Vhost patches

7. Feature support
Continuous feature development in both communities

8. DPDK Vhost re-integration in progress
DPDK evolution in upcoming releases
Vhost enqueue performance enhancement
Delay copy at TX side
A single Vhost for VPP on the way – VPP 17.01
Better integration with Vhost PMD
Code clean up
Now we’re bringing it all to VPP!

9. Summary The Power and Beauty of Open Source!
DPDK Vhost is evolving continuously
Richer function support, better performance
Bring DPDK Vhost into VPP
A single Vhost, let’s do it together!
Maintainer: