Ethernet Performance on AM263x

Table of Contents

• Introduction
• Setup Details
• Layer 2 Performance
  • Configuration Details
  • Layer 2 Latency
  • Layer 2 Throughput
• TCP/IP Performance
  • Configuration Details
    • TCP Throughput
    • UDP Throughput
• Ether-Ring Performance
• Ether-Ring Round Trip Latency with CAN(Vehicle) traffic
• See Also

Introduction

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

Setup Details

SOC Details	Values
Core	R5F
Core Operating Speed	400 MHz
Memory Type	MSRAM
Cache status	Enabled

Layer 2 Performance

Latency defination

Configuration Details

Configuration	Value
Processing Core	Main R5F0 Core 0
Core Frequency	400 MHz
Ethernet Interface Type	RGMII at 1 Gbps
Packet buffer memory	MSRAM (un-cached)
Scatter-gather TX	Yes
Scatter-gather RX	Yes
CPDMA interrupt pacing	Yes
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 (DP83869HM)Latency (from datasheet) in ns	Total Latency (ns)
RX Latency	6400	193	6193
TX Latency	13000	384	13384

Layer 2 Throughput

Test	Bandwidth (Mbps)	CPU Load (%)	Packet Size (bytes)
Layer 2 Transmission	950	24	1500

TCP/IP Performance

Configuration Details

Configuration	Value
Processing Core	Main R5F0 Core 0
Core Frequency	400 MHz
Ethernet Interface Type	RGMII at 1 Gbps
Packet buffer memory	MSRAM (cached)
Hardware checksum offload	Enabled on Tx side Disabled on Rx Side
Scatter-gather TX	Yes
Scatter-gather RX	Yes
CPDMA interrupt pacing	Yes
RTOS	FreeRTOS
RTOS application	Enet Lwip CPSW Example example
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	178	98
TCP TX	178	98
TCP Bidirectional	RX=53 TX=132	100

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 = 64B			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 (%)	Bandwidth (Mbps)	CPU Load (%)	Packet Loss (%)
UDP RX	5	37	0.0	5	18	0.0	25	44	0.0	50	37	0.0
	10	67	2.6	15	50	0.0	50	80	0.0	60	44	0.0
	15	96	5.5	25	73	4.4	55	88	4.9	95	68	0.0
UDP RX (Max)	7	51	0.8	19	60	0.6	51	64	0.0	110	78	2.4
UDP TX (Max)	24.6	100	0.0	56.2	100	0.0	112	100	0.0	323	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 -l256 -b <bw> -r
  where <bw> is 25M, 50M, 100M, etc
  
• Test with datagram length of 512B:
  $iperf -c <evm_ip> -u -l512 -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
  

Ether-Ring Performance

Traffic Type	Average Latency(us)	Max Latency(us)
Profile-A(Transmit-Heavy)	44	94
Profile-B(Receive-Heavy)	40	96
Profile-C(Symmetric Traffic)	27	80

Ether-Ring Round Trip Latency with CAN(Vehicle) traffic

Packet Rate(per sec)	Average Latency(us)	Max Latency(us)
2000	561	569

See Also

Ethernet And Networking Enet Lwip CPSW Example Enet CPSW Ether-Ring CAN Example Enet CPSW Ether-Ring Real-time and LWIP Traffic Generator Application Enet CPSW Ether-Ring TSN Example