Borrowing from the User Guide:
SR‐IOV enabled on Solarflare adapters provides accelerated cut‐through performance and is fully compatible with hypervisor based services and management tools. The advanced design of the Solarflare SFN7000 series adapter incorporates a number of features to support SR‐IOV. These features can be summarized as follows:
Multiple PCIe Physical Functions (PF).
Each physical port on the dual‐port 10G or 40G adapter can be exposed to the OS as multiple physical functions. A total of 16 PFs are supported per adapter with each having a unique MAC address.
PCIe Virtual Functions (VF).
A PF can support a configurable number of PCIe virtual functions. In total 240 VFs can be allocated between the PFs. The adapter can also support a total of 2048 MSI‐X interrupts.
Layer 2 Switching Capability.
A layer 2 switch configured in firmware supports the transport of network packets between PCI physical functions (PF) and Virtual functions (VF). This allows received packets to be replicated across multiple PFs/VFs and allows packets transmitted from one PF to be received on another PF or VF.
- On a 10GbE dual‐port adapter each physical port can be exposed as a maximum 8 PFs
- On a 40GbE dual‐port adapter (in 2*40G mode) each physical port can be exposed as a maximum 8 PFs.
All of this allows each VM to receive it's own Virtual NIC. This enables applications to communicate directly with the wire via Hypervisor Bypass, PCI Passthru or DirectPath I/O. This restores native network performance to VMs. So with dual port 10G adapters Solarflare provides support for 8PFs per physical port and a total of 240 VFs per adapter.
- On a 40GbE dual‐port adapter (in 4*10G mode) each physical port can be exposed as a maximum 4 PFs.
Furthermore Solarflare also supports Kernel Bypass alongside Hypervisor Bypass to deliver new bare metal ultra-low latency from within a VM.
To learn more drop me an email.