Usage Of Multiple Queues; Lom Performance; Figure 21. Bcm5716C Lom's Multiple Queues In Virtual Environment - Dell PowerEdge R310 Technical Manual

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Jumbo frame support in virtual environments also saves CPU utilization due to interrupt reduction and

increases throughput by allowing the system to concentrate on the data in the frames, instead of the frames

around the data.

NetQueue in VMware enables BCM5716C to provide extended performance benefits that meet the demands

of bandwidth intensive applications requiring high performance and higher networking throughput in a

virtual environment

NetQueue support of BCM5716C in VMware removes single queue bottlenecks, and use of stateful offloads

such as TCP offload and iSCSI hardware-based acceleration in virtual environments is proven to provide

excellent performance on VM.

Usage of Multiple Queues

11.22

Current hardware trends of increased processor core density are leading to an increased number of VMs

requiring more CPU cycles to route packets to the VMs. For example, it is common today to expect to have

quad core processors on each blade. That indicates 2^3 blades * 2^2 threads = 2^5 threads per chassis. By

utilizing the hardware queues provided by the network controller, VM vendors have eliminated the single

thread limitation in a traditional OS and have optimized the hypervisor for multiple hardware threads.

The first attempt to address these problems is to offload these tasks into BCM5716C, where the transport

queue manager can transmit packets from multiple queues and can steer the receive packets into multiple

queues. By dedicating Tx/Rx queue pair to a VM, the network adapter can provide DMA to and from the VM's

memory, and vSwitch will only process the control plane operation.

11.23

BCM5716C LOM has been designed to work in various workload environments and described below. End

customers are encouraged to enable Broadcom LOM for following environments.

Dell PowerEdge R310 Technical Guide

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