Ethernet Performance

Table of Contents

• Introduction
• Setup Details
• Layer 2 Performance
  • Configuration Details
  • Layer 2 Latency
• TCP/IP Performance
  • Configuration Details
    • TCP Throughput
    • UDP Throughput
• See Also

Introduction

This section provides the performance numbers of Ethernet drivers using CPSW peripheral in MCU+ SDK

Setup Details

SOC Details	Values
Core	A53
Core Operating Speed	1 GHz
Memory Type	DDR
Cache status	Enabled
EVM Type	AM62x-SK

Layer 2 Performance

Latency defination

Configuration Details

Configuration	Value
Processing Core	Main A53 Core 0
Core Frequency	1 GHz
Ethernet Interface Type	RGMII at 1 Gbps
Packet buffer memory	DDR (uncached)
Scatter-gather TX	Yes
Scatter-gather RX	Yes
UDMA interrupt pacing	NO
RTOS	FreeRTOS
RTOS application	Modified Enet CPSW Loopback Example example
Host PC tool version	nload
Rx packet length	200 B
Tx packet length	200 B

Layer 2 Latency

Parameter	CPU<->CPSW Latency Value (ns)	PHY (DP83867IR) Latency (from datasheet) in ns	Total Latency (ns)
RX Latency	19000	288	19288
TX Latency	7000	384	7384

TCP/IP Performance

Configuration Details

Configuration	Value
Processing Core	Main A53Core 0
Core Frequency	1 GHz
Ethernet Interface Type	RGMII at 1 Gbps
Packet buffer memory	DDR (cached)
Hardware checksum offload	Enabled on both Tx and Rx Side
Scatter-gather TX	Yes
Scatter-gather RX	Yes
UDMA interrupt pacing	Yes (realized with timer based interrupt pacing)
RTOS	FreeRTOS
RTOS application	Enet Lwip CPSW Example in examples
TCP/IP stack	LwIP version STABLE-2_2_0_RELEASE
Host PC tool version	iperf v2.0.10
Number of Rx packet buffers	32
Number of Tx packet buffers	16

TCP Throughput

Test	Bandwidth (Mbps)	CPU Load (%)
TCP RX	93	11
TCP TX	93	11
TCP Bidirectional	RX=93 TX=93	24

Host PC commands:

• TCP Rx and Tx (Sequential):
  $iperf -c <evm_ip> -r
  
• TCP Rx and Tx (Bidirectional):
  $iperf -c <evm_ip> -d
  

UDP Throughput

Test	Datagram Length = 256B			Datagram Length = 512B			Datagram Length = 1470B
	Bandwidth (Mbps)	CPU Load (%)	Packet Loss (%)	Bandwidth (Mbps)	CPU Load (%)	Packet Loss (%)	Bandwidth (Mbps)	CPU Load (%)	Packet Loss (%)
UDP RX	5	4	0	25	9	0.016	50	7.44	0
	10	7	0	50	17.2	0.11	65	9.27	0.01
	25	16.6	0.06	65	21	4.8	95	13.14	0.66
UDP RX (Max)	30	19.7	0.1	60	20	0.1	175	23.4	0.59
UDP RX (Max) with 128 Rx buffers	115	69.1	0.1	240	74.8	0.1	720	90.8	1.3
UDP TX (Max)	175	100	0.05	350	100	0.0	957	100	0.0

Host PC commands:

• Test with datagram length of 64B:
  $iperf -c <evm_ip> -u -l64 -b <bw> -r
  where <bw> is 5M, 10M, 15M, etc
  
• Test with datagram length of 256B:
  $iperf -c <evm_ip> -u -l 256 -b <bw> -r
  where <bw> is 25M, 50M, 100M, etc
  
• Test with datagram length of 512B:
  $iperf -c <evm_ip> -u -l 512 -b <bw> -r
  where <bw> is 25M, 50M, 100M, etc
  
• Test with datagram length of 1470B (max):
  $iperf -c <evm_ip> -u -b <bw> -r
  where <bw> is 25M, 50M, 100M, etc
  

See Also

Ethernet And Networking Enet Lwip CPSW Example