User Manual

Rev 4.70
Mellanox Technologies
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8.9.6 DSCP Sanity Testing
To verify that all QoS and DSCP settings were correct, you can capture incoming and outgoing
traffic by using the ibdump tool and see the DSCP value in the captured packets as displayed in
the figure below.
8.10 SR-IOV
Single Root I/O Virtualization (SR-IOV) is a technology that allows a physical PCIe device to
present itself multiple times through the PCIe bus. This technology enables multiple virtual
instances of the device with separate resources. Mellanox adapters are capable of exposing in
ConnectX®-3/ConnectX®-3 Pro adapter cards, up to 126 virtual instances called Virtual Func-
tions (VFs). These virtual functions can then be provisioned separately. Each VF can be seen as
an addition device connected to the Physical Function. It also shares resources with the Physical
Function.
SR-IOV is commonly used in conjunction with an SR-IOV enabled hypervisor to provide virtual
machines direct hardware access to network resources hence increasing its performance.
This guide demonstrates the setup and configuration of SR-IOV, using Mellanox ConnectX®
VPI adapter cards family, in Windows Server 2012 R2 and above. SR-IOV VF is a single port
device.
RroceDscpMarkPriorityFlowControl_7 7
Table 8 - DSCP Default Registry Keys Settings
Registry Key Default Value