User Manual

Rev 4.70

Mellanox Technologies

11.1.5 SR-IOV Tuning

To achieve best performance on SR-IOV VF, please run the following powershell commands on

the host:

11.1.6 Improving Live Migration

In order to improve live migration over SMB direct performance, please set the following regis-

try key to 0 and reboot the machine:

For further details, please refer to:

http://blogs.technet.com/b/josebda/archive/2010/12/01/the-basics-of-smb-signing-covering-

both-smb1-and-smb2.aspx

11.2 Application Specific Optimization and Tuning

11.2.1 Ethernet Performance Tuning

The user can configure the Ethernet adapter by setting some registry keys. The registry keys may

affect Ethernet performance.

 To improve performance, activate the performance tuning tool as follows:

Step 1. Start the "Device Manager" (open a command line window and enter: devmgmt.msc).

Step 2. Open "Network Adapters".

Step 3. Right click the relevant Ethernet adapter and select Properties.

Step 4. Select the "Advanced" tab

Step 5. Modify performance parameters (properties) as desired.

11.2.1.1 Performance Known Issues

• On Intel I/OAT supported systems, it is highly recommended to install and enable the

latest I/OAT driver (download from www.intel.com).

• With I/OAT enabled, sending 256-byte messages or larger will activate I/OAT. This will

cause a significant latency increase due to I/OAT algorithms. On the other hand,

throughput will increase significantly when using I/OAT.

11.2.2 IPoIB Performance Tuning

The user can configure the IPoIB adapter by setting some registry keys. The registry keys may

affect IPoIB performance.

For the complete list of registry entries that may be added/changed by the performance tuning

procedure, see MLNX_VPI_WinOF Registry Keys following the path below:

Set-VMNetworkAdapter -Name "Network Adapter" -VMName vm1 -IovQueuePairsRequested 4

Set-VMNetworkAdapter -Name "Network Adapter" -VMName vm1 -IovQueuePairsRequested 8

for 40GbE

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanServer\Parameters\RequireSe-

curitySignature