Location via proxy:   [ UP ]  
[Report a bug]   [Manage cookies]                
SlideShare a Scribd company logo

Tech Talk by Ben Pfaff: Open vSwitch - Part 2

•
•
N
nvirters

Open vSwitch - Part 2 A previous presentation in March 2013 at Bay Area Network Virtualization meetup covered the past, present, and predicted future of Open vSwitch. This talk picks up where that one left off, covering improvements made in Open vSwitch since then, new directions for the coming year, and some related work of interest in the industry. About Ben Pfaff (twitter: @Ben_Pfaff) Ben joined Nicira as one of its first employees in 2007 after finishing his PhD at Stanford. Since then he has been working on what became OpenFlow and Open vSwitch. He also made some early contributions to the NOX controller. He has been involved with free software since about 1996, when he started work on GNU PSPP and joined the Debian project. More info @ http://meetup.com/openvswitch Follow us on twitter @nvirters

1 of 15
Download to read offline
Open vSwitch: Part 2 Ben Pfaff VMware NSBU
What is Open vSwitch? Semi-official description: Open vSwitch is a production quality, multilayer virtual switch licensed under the open source Apache 2.0 license. It is designed to enable massive network automation through programmatic extension, while still supporting standard management interfaces and protocols (e.g. NetFlow, sFlow, SPAN, RSPAN, CLI, LACP, 802.1ag). The exciting parts: ● Write a program to control your network. ● Fast! ● Portable: OSes, hypervisors, CMSes, ...
Open vSwitch Hall of Fame: New Inductees Alex Wang Alexandru Copot Alin Serdean Andy Zhou Ankur Sharma Daniele Di Proietto Flavio Leitner Helmut Schaa Jean Tourrilhes Lorand Jakab Nithin Raju Pavithra Ramesh Ryan Wilson Thomas Graf YAMAMOTO Takashi Contributors with 10 or more commits now (but not in March 2013)
Tech Talk by Ben Pfaff: Open vSwitch - Part 2
New Features ● Six major releases: v1.10 through v2.3. ● OpenFlow 1.1, 1.2, 1.3, some 1.4, prototypes for 1.5 ● Tunnels: VXLAN, LISP, Geneve ● MPLS ● Multicast snooping ● RSTP ● TCP flags matching
New Platforms ● NetBSD ● ESX ● Windows (in progress)
Build Improvements ● More tests: 1179→ 1561 ● Compiler support: – Clang (thread safety!) – MSVC 2013 ● check-oftest ● check-ryu ● Travis continuous integration ● Coverity Scan
OVS Caching ovs-vswitchd openvswitch.ko user kernel firstpacket later packets
● 99% of traffic is not a problem: – Small number of long flows – Large number of medium-length flows. ● Tuning solves some problems. ● Real problem is large numbers of short flows: – Port scans – Peer-to-peer rendezvous servers – Distributed systems – Network monitoring applications Performance, circa OVS 1.9
Megaflows (OVS v1.11) ● Most of the time the whole microflow doesn't matter, e.g. MAC learning ● Push classifier into kernel ● Hard part: userspace generates megaflows ● Exact-match cache layer
Threading (OVS v2.0) ● TCP_CRR ≈ ApacheBench: latency sensitive ● Main loop is busy ● Added periodic packet processing calls ● v2.0: Packet threads ● v2.1: Revalidation, flow setup threads – Why is revalidation important? ● v2.3: Removed dispatcher threads
DPDK/netmap/PF_RING/... ● What are they? ● How do they help? – Fast and clever. – No baggage. – No ring transition. ● OVS v2.4 will support DPDK – Basic work was simple – Preliminary numbers are very good
Performance: Fairness ● Which flows get dropped? – Random is bad. – Per-tenant fairness is better. ● Per-port fairness (OVS v1.11). ● Per-destination fairness: no plans.
OVS 2014 Fall Conference ● Nov. 17 and 18 at VMware in Palo Alto ● Soliciting talks now until Oct. 6 – User, dev, admin, research talks all welcome ● Sign up to attend now ● More information: – Follow link from openvswitch.org ● Free!
Questions?

More Related Content

Tech Talk by Ben Pfaff: Open vSwitch - Part 2

  • 1. Open vSwitch: Part 2 Ben Pfaff VMware NSBU
  • 2. What is Open vSwitch? Semi-official description: Open vSwitch is a production quality, multilayer virtual switch licensed under the open source Apache 2.0 license. It is designed to enable massive network automation through programmatic extension, while still supporting standard management interfaces and protocols (e.g. NetFlow, sFlow, SPAN, RSPAN, CLI, LACP, 802.1ag). The exciting parts: ● Write a program to control your network. ● Fast! ● Portable: OSes, hypervisors, CMSes, ...
  • 3. Open vSwitch Hall of Fame: New Inductees Alex Wang Alexandru Copot Alin Serdean Andy Zhou Ankur Sharma Daniele Di Proietto Flavio Leitner Helmut Schaa Jean Tourrilhes Lorand Jakab Nithin Raju Pavithra Ramesh Ryan Wilson Thomas Graf YAMAMOTO Takashi Contributors with 10 or more commits now (but not in March 2013)
  • 5. New Features ● Six major releases: v1.10 through v2.3. ● OpenFlow 1.1, 1.2, 1.3, some 1.4, prototypes for 1.5 ● Tunnels: VXLAN, LISP, Geneve ● MPLS ● Multicast snooping ● RSTP ● TCP flags matching
  • 6. New Platforms ● NetBSD ● ESX ● Windows (in progress)
  • 7. Build Improvements ● More tests: 1179→ 1561 ● Compiler support: – Clang (thread safety!) – MSVC 2013 ● check-oftest ● check-ryu ● Travis continuous integration ● Coverity Scan
  • 9. ● 99% of traffic is not a problem: – Small number of long flows – Large number of medium-length flows. ● Tuning solves some problems. ● Real problem is large numbers of short flows: – Port scans – Peer-to-peer rendezvous servers – Distributed systems – Network monitoring applications Performance, circa OVS 1.9
  • 10. Megaflows (OVS v1.11) ● Most of the time the whole microflow doesn't matter, e.g. MAC learning ● Push classifier into kernel ● Hard part: userspace generates megaflows ● Exact-match cache layer
  • 11. Threading (OVS v2.0) ● TCP_CRR ≈ ApacheBench: latency sensitive ● Main loop is busy ● Added periodic packet processing calls ● v2.0: Packet threads ● v2.1: Revalidation, flow setup threads – Why is revalidation important? ● v2.3: Removed dispatcher threads
  • 12. DPDK/netmap/PF_RING/... ● What are they? ● How do they help? – Fast and clever. – No baggage. – No ring transition. ● OVS v2.4 will support DPDK – Basic work was simple – Preliminary numbers are very good
  • 13. Performance: Fairness ● Which flows get dropped? – Random is bad. – Per-tenant fairness is better. ● Per-port fairness (OVS v1.11). ● Per-destination fairness: no plans.
  • 14. OVS 2014 Fall Conference ● Nov. 17 and 18 at VMware in Palo Alto ● Soliciting talks now until Oct. 6 – User, dev, admin, research talks all welcome ● Sign up to attend now ● More information: – Follow link from openvswitch.org ● Free!