Ethernet Performance on AM273x

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
• 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	MSS L2 RAM
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 100 mbps
Packet buffer memory	MSS L2 RAM (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 latency (from datasheet) in ns	Total Latency (ns)
RX Latency	4000	193	4193
TX Latency	14000	384	14384

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 100 Mbps
Packet buffer memory	MSS L2 RAM (cached)
Hardware checksum offload	Disabled 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	95	74.7
TCP TX	95	79.5
TCP Bidirectional	RX=63 TX=63	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 = 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	25	99	0.0	25	56	0.0	25	25	0.0
	50	100	64	50	100	3.4	50	46	0.0
	96	100	80	96	100	100	96	81	0.0
UDP RX (Max)	Not Tested	-	-	Not Tested	-	-	96	81	0.0
UDP TX (Max)	Not Tested	-	-	Not Tested	-	-	95.7	55	0.0

Host PC commands:

• Test with datagram length of 64B:
  $iperf -c <evm_ip> -u -l64 -b<bw> -r
  where <bw> is 25M, 50M, 100M, 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
  

See Also

Ethernet And Networking Enet Lwip CPSW Example