What is EMAC in Ethernet?
EMAC Overview Each EMAC is an internal bus master and sends Ethernet packets to and from the system Interconnect. The Synopsys protocol is a descriptor ring protocol, where the descriptor contains an address to a buffer to store the packet data.
What is EMAC driver?
The scope of this document is limited to Ethernet (IEEE 802.3) or Ethernet-like devices, such as Wi-Fi (IEEE 802.11), where the device presents a MAC interface to send and receive frames, and one of the onboard network stacks that runs on Mbed OS on the host processor uses this. …
What is descriptor in Ethernet?
Descriptor rings are a general concept, not specific to Freescale nor to Vybird. They are provided so that the user should be able to allocate memory ahead of time. Each descriptor gives a single command (i.e. a single Ethernet packet directive) to the controller.
What is a packet descriptor?
In NetAdapterCx, packet descriptors are small, compact, runtime-extensible structures that describe a network packet. Each packet requires the following: One core descriptor. Zero or more packet extensions.
What is Nic ring buffer?
Ring buffers, also known as circular buffers, are shared buffers between the device driver and Network Interface Card (NIC). These buffers store incoming packets until the device driver can process them. Ring buffers exist on both the receive (rx) and transmit (tx) side of each interface on the firewall.
How do you read the show running Resource Monitor?
How to Interpret: show running resource-monitor
- CPU utlization % per function group – “CPU load sampling by group”
- CPU utlization % per core – “CPU load (%) during last”
- Session utlization %
- Packet buffer utilization %
- Packet descriptor utlization %
- Packet on-chip descriptor utilization %
What is NIC Rx?
On NICs, receive (Rx) rings and transmit (Tx) rings are hardware resources through which the system receives and sends network packets, respectively. For example, you can allocate more number of receive (Rx) rings for a link that is receiving more packets.
What is DMA NIC?
DMA (direct memory access) allows the network device to move packet data directly to the system’s memory, reducing CPU utilization. DMA coalescing allows the NIC to collect packets before it initiates a DMA event.
How do I run Resource Monitor?
Press the Ctrl + Alt + Del keys at the same time and select Start Task Manager on the screen that appears. In the Task Manager, click the Performance tab, then click the Resource Monitor button or Open Resource Monitor link, depending on your version of Windows.
What is RX and TX buffer?
Transmit and receive buffers are used to regulate the flow of data frames between adapters and protocol stacks. Although the default settings are usually acceptable, increasing the number may improve performance if network traffic is heavy, but it will also use system memory.
What is NIC ring buffer?