Lenovo ThinkSystem SN850 Product Manual - Page 26
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Figure 6. Location of fabric connector in SN850 server
Table 25 and Figure 9
show how the 4 ports of the embedded controller connect through the Fabric
Connector to the corresponding I/O module ports. The Fabric Connector can be removed, if required, to
allow the installation of an I/O adapter on I/O connector 3.
The embedded 10Gb controller is based on the Intel Ethernet Connection X722 network controller which is
part of the Intel C624 "Lewisburg" PCH chipset of the SN850 and other Lenovo ThinkSystem servers.
The Intel X722 controller is optimized for data center, cloud, and mobile applications and includes the
following features:
VXLAN/NVGRE Hardware Offloads: These stateless offloads preserve application performance for
overlay networks. With these offloads, it is possible to distribute network traffic across CPU cores.
At the same time, the controller offloads LSO, GSO, and checksum from the host software, which
reduces CPU overhead.
Low latency: Intel Ethernet Flow Director delivers hardware-based application steering and Intel
Data Direct I/O makes the processor cache the primary destination and source of I/O data rather
than main memory.
Virtualization performance: With Intel Virtualization Technology (VT), the controller delivers
outstanding I/O performance in virtualized server environments. The controller reduces I/O
bottlenecks by providing intelligent offloads for networking traffic per virtual machine (VM), which
enables near-line rate speeds for small packets and supports almost an unlimited amount of
isolated traffic flows so that you can scale your cloud environment.
Next-generation VMDq: The controller supports up to 128 VMDq VMs and offers enhanced Quality
of Service (QoS) by providing weighted round-robin servicing for the Tx data. The controller offloads
the data-sorting functionality from the hypervisor to the network silicon, which improves data
throughput and CPU usage.
SR-IOV implementation: Provides an implementation of the PCI-SIG standard for I/O Virtualization.
The physical configuration of each port is divided into multiple virtual ports. Each virtual port is
assigned to an individual VM directly by bypassing the virtual switch in the Hypervisor, which results
in near-native performance.
iWarp RDMA support implements kernel bypass and direct data placement and allows for more
efficient high-speed networking by eliminating queues and network related interrupts
Lenovo ThinkSystem SN850 Server
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