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Thursday, November 16 • 11:05am - 11:30am
Trouble-shooting the Data Plane in OVS

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As OVS is getting adopted in wide variety of deployments, both the complexity of the OVS configuration and of the environment in which OVS operates are constantly increasing.

Especially in the event of data plane issues, such as packet drops, mis-routing of packets, or performance degradation (throughput or latency) it is often extremely difficult to find the root cause of the problem. Currently available OVS debug commands and tools do not provide much aid in troubleshooting such problems, especially on target systems.

In this talk we present new debugging tools and techniques tailored for an efficient root cause analysis of data plane problems in OVS. These tools are designed to be used in production deployments with only minimal disturbance on the real-time performance of OVS even under very high load.

We are addressing two complementary classes of problems that have emerged in our testing of OVS-DPDK in Telco Cloud (NFVI) environment: 1. Sporadic latency spikes and bursts of dropped packets due to non-deterministic real-time behavior of OVS PMDs. 2. Systematic packet drops or mis-routed packets due to unexpected packet format/content, OVS configuration errors or software faults in OVS.

The presented debugging tools and techniques are work in progress and will be upstream soon (targeting OVS 2.9).

Thursday November 16, 2017 11:05am - 11:30am