Red Hat APPLICATION STACK 2.0 RELEASE Uživatelský manuál stáhnout pdf (Strana 12)

Rev 1.1

Network Virtualization on ConnectX-3 Adapters

Mellanox Technologies Confidential

 QoS: The eSwitch supports traffic class management, priority mapping, rate limiting, and

scheduling. In addition, DCBX control plane can set Priority Flow Control (PFC) and FC

parameters on the physical port.

 Monitoring: Port counters are supported.

3.1 Performance Measurements

Many data center applications require lower latency network performance. Some applications

require latency stability as well. Using regular TCP connectivity between VMs can create high

latency and unpredictable delay behavior.

Figure 5 shows the dramatic difference (20X) when using para-virtualized vNIC running a

TCP stream compared to SR-IOV connectivity running RDMA.

Due to the direct connection of the SR-IOV and the ConnectX-3 hardware capabilities, there is

a significant reduction in software interference that adds unpredictable delay to the packet

processing.

Figure 5: Latency Comparison

3.2 Seamless OpenStack Integration

The eSwitch configuration is transparent to the Red Hat Enterprise Linux OpenStack Platform

4.0 administrator. The installed eSwitch daemon on the server is responsible for hiding the

low-level configuration. The administrator will use the OpenStack dashboard for the fabric

management.

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Red Hat APPLICATION STACK 2.0 RELEASE Uživatelský manuál Strana 12