之前使用I.MX6Q/I.MX6Q(imx_3.0.35_4.1.0), 1GB RGMII 以太網測試性能大概 495Mbits/sec, 如下是iperf測試過程。

iperf -c 192.168.0.112-u -b 800M -t 10 -l 1000

Client connecting to 192.168.112.125, UDP port 5002

Sending 1000 byte datagrams

UDP buffer size: 208 KByte (default)

[ 3] local 192.168.112.6 port 45230 connected with 192.168.112.125 port 5002

[ ID] Interval Transfer Bandwidth

[ 3] 0.0-10.0 sec 590 MBytes 495 Mbits/sec

[ 3] Sent 618437 datagrams

[ 3] WARNING: did not receive ack of last datagram after 10 tries.

讀勘誤手冊 "Chip Errata for the i.MX 6"，里面有如下描述ERR004512:

IMX6DQCE (nxp.com.cn) 確實和測試比較吻合。

目前使用 MIMXRT1176AVM8A MCU 芯片內置的1G 以太網。

為了驗證網絡性能，使用Iperf 吞吐性能測試如下：硬件電路板——MIMXRT1170-EVK C2，軟件包—— SDK_2.12.0-MIMXRT1170-EVK，下載鏈接如下。添加 iperf 代碼到 lwip_ping_freertos_cm7中，使用flexspi nor sdram 調試。

lwipopts.h文件需要做如下配置才能達到比較高的網絡速率，如下是測試結果。

這些結果不完全相同，與主機操作系統也存在性能差異，不同的主機性能也存在顯著差異。總體來講 MIMXRT1176 MCU的 1G網絡性能是沒有I.MX6上面的速率限制的問題。

lwipopts.h 配置文件如下：

/** @file lwipopts.h

* This file is based on srcincludelwipopt.h*/

#ifndef __LWIPOPTS_H__

#define __LWIPOPTS_H__

#include "fsl_device_registers.h"

#if USE_RTOS

/*SYS_LIGHTWEIGHT_PROT==1: if you want inter-task protection for certain critical regions during buffer allocation, deallocation and memoryallocation and deallocation. */

#define SYS_LIGHTWEIGHT_PROT 1

/*NO_SYS==0: Use RTOS */

#define NO_SYS 0

/*LWIP_NETCONN==1: Enable Netconn API (require to use api_lib.c)*/

#define LWIP_NETCONN 1

/** LWIP_SOCKET==1: Enable Socket API (require to use sockets.c)*/

#define LWIP_SOCKET 1

/**LWIP_SO_RCVTIMEO==1: Enable receive timeout for sockets/netconns andSO_RCVTIMEO processing.*/

#define LWIP_SO_RCVTIMEO 1

#else

/** NO_SYS==1: Bare metal lwIP*/

#define NO_SYS 1

/*LWIP_NETCONN==0: Disable Netconn API (require to use api_lib.c)*/

#define LWIP_NETCONN 0

/** LWIP_SOCKET==0: Disable Socket API (require to use sockets.c)*/

#define LWIP_SOCKET 0

/** LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT=1: we need to free PBUF_RAM pbufsfrom ISR context on LPC.*/

#if defined(FSL_FEATURE_SOC_LPC_ENET_COUNT) && (FSL_FEATURE_SOC_LPC_ENET_COUNT > 0)

#ifndef LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT

#define LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT 1

#endif

#endif

#endif

/* ---------- Core locking ---------- */

void sys_check_core_locking(void);

#define LWIP_ASSERT_CORE_LOCKED() sys_check_core_locking()

/* ---------- Memory options ---------- */

/**

* MEM_ALIGNMENT: should be set to the alignment of the CPU

* 4 byte alignment -> #define MEM_ALIGNMENT 4

* 2 byte alignment -> #define MEM_ALIGNMENT 2

*/

#ifndef MEM_ALIGNMENT

#define MEM_ALIGNMENT 4

#endif

/**

* MEM_SIZE: the size of the heap memory. If the application will send

* a lot of data that needs to be copied, this should be set high.

*/

#ifndef MEM_SIZE

#define MEM_SIZE (22 * 1024)

#endif

/* MEMP_NUM_PBUF: the number of memp struct pbufs. If the applicationsends a lot of data out of ROM (or other static memory), this should be set high. */

#ifndef MEMP_NUM_PBUF

#define MEMP_NUM_PBUF ((TCP_WND + TCP_SND_BUF) / TCP_MSS)//15

#endif

/* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. Oneper active UDP "connection". */

#ifndef MEMP_NUM_UDP_PCB

#define MEMP_NUM_UDP_PCB 6

#endif

/* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP

connections. */

#ifndef MEMP_NUM_TCP_PCB

#define MEMP_NUM_TCP_PCB 10

#endif

/* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP

connections. */

#ifndef MEMP_NUM_TCP_PCB_LISTEN

#define MEMP_NUM_TCP_PCB_LISTEN 6

#endif

/* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP

segments. */

#ifndef MEMP_NUM_TCP_SEG

#define MEMP_NUM_TCP_SEG ((3 * TCP_SND_BUF) / TCP_MSS + 1)//22

#endif

/* MEMP_NUM_SYS_TIMEOUT: the number of simulateously active

timeouts. */

#ifndef MEMP_NUM_SYS_TIMEOUT

#define MEMP_NUM_SYS_TIMEOUT 10

#endif

/* ---------- Pbuf options ---------- */

/* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. */

#ifndef PBUF_POOL_SIZE

#define PBUF_POOL_SIZE 20//9

#endif

/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */

/* Default value is defined in lwipsrcincludelwipopt.h as

LWIP_MEM_ALIGN_SIZE(TCP_MSS+40+PBUF_LINK_ENCAPSULATION_HLEN+PBUF_LINK_HLEN)*/

/* ---------- TCP options ---------- */

#ifndef LWIP_TCP

#define LWIP_TCP 1

#endif

#ifndef TCP_TTL

#define TCP_TTL 255

#endif

/* Controls if TCP should queue segments that arrive out of

order. Define to 0 if your device is low on memory. */

#ifndef TCP_QUEUE_OOSEQ

#define TCP_QUEUE_OOSEQ 0

#endif

/* TCP Maximum segment size. */

#ifndef TCP_MSS

#define TCP_MSS (1500 - 40) /* TCP_MSS = (Ethernet MTU - IP header size - TCP header size) */

#endif

/* TCP sender buffer space (bytes). */

#ifndef TCP_SND_BUF

#define TCP_SND_BUF (40 * TCP_MSS)//(6 * TCP_MSS) // 2

#endif

/* TCP sender buffer space (pbufs). This must be at least = 2 *

TCP_SND_BUF/TCP_MSS for things to work. */

#ifndef TCP_SND_QUEUELEN

#define TCP_SND_QUEUELEN (3 * TCP_SND_BUF) / TCP_MSS // 6

#endif

/* TCP receive window. */

#ifndef TCP_WND

#define TCP_WND (20 * TCP_MSS)//(2 * TCP_MSS)

#endif

/* Enable backlog*/

#ifndef TCP_LISTEN_BACKLOG

#define TCP_LISTEN_BACKLOG 1

#endif

/* ---------- ICMP options ---------- */

#ifndef LWIP_ICMP

#define LWIP_ICMP 1

#endif

/* ---------- DHCP options ---------- */

/* Enable DHCP module. */

#ifndef LWIP_DHCP

#define LWIP_DHCP 1

#endif

/* ---------- UDP options ---------- */

#ifndef LWIP_UDP

#define LWIP_UDP 1

#endif

#ifndef UDP_TTL

#define UDP_TTL 255

#endif

/* ---------- Statistics options ---------- */

#ifndef LWIP_STATS

#define LWIP_STATS 0

#endif

#ifndef LWIP_PROVIDE_ERRNO

#define LWIP_PROVIDE_ERRNO 1

#endif

/*---------- Checksum options ----------

*/

/*Some MCU allow computing and verifying the IP, UDP, TCP and ICMP checksums by hardware:

- To use this feature let the following define uncommented.

- To disable it and process by CPU comment the the checksum.

*/

//#define CHECKSUM_BY_HARDWARE

#ifdef CHECKSUM_BY_HARDWARE

/* CHECKSUM_GEN_IP==0: Generate checksums by hardware for outgoing IP packets.*/

#define CHECKSUM_GEN_IP 0

/* CHECKSUM_GEN_UDP==0: Generate checksums by hardware for outgoing UDP packets.*/

#define CHECKSUM_GEN_UDP 0

/* CHECKSUM_GEN_TCP==0: Generate checksums by hardware for outgoing TCP packets.*/

#define CHECKSUM_GEN_TCP 0

/* CHECKSUM_CHECK_IP==0: Check checksums by hardware for incoming IP packets.*/

#define CHECKSUM_CHECK_IP 0

/* CHECKSUM_CHECK_UDP==0: Check checksums by hardware for incoming UDP packets.*/

#define CHECKSUM_CHECK_UDP 0

/* CHECKSUM_CHECK_TCP==0: Check checksums by hardware for incoming TCP packets.*/

#define CHECKSUM_CHECK_TCP 0

#else

/* CHECKSUM_GEN_IP==1: Generate checksums in software for outgoing IP packets.*/

#define CHECKSUM_GEN_IP 1

/* CHECKSUM_GEN_UDP==1: Generate checksums in software for outgoing UDP packets.*/

#define CHECKSUM_GEN_UDP 1

/* CHECKSUM_GEN_TCP==1: Generate checksums in software for outgoing TCP packets.*/

#define CHECKSUM_GEN_TCP 1

/* CHECKSUM_CHECK_IP==1: Check checksums in software for incoming IP packets.*/

#define CHECKSUM_CHECK_IP 1

/* CHECKSUM_CHECK_UDP==1: Check checksums in software for incoming UDP packets.*/

#define CHECKSUM_CHECK_UDP 1

/* CHECKSUM_CHECK_TCP==1: Check checksums in software for incoming TCP packets.*/

#define CHECKSUM_CHECK_TCP 1

#endif

/*DEFAULT_THREAD_STACKSIZE: The stack size used by any other lwIP thread.The stack size value itself is platform-dependent, but is passed tosys_thread_new() when the thread is created.*/

#ifndef DEFAULT_THREAD_STACKSIZE

#define DEFAULT_THREAD_STACKSIZE 3000

#endif

/*DEFAULT_THREAD_PRIO: The priority assigned to any other lwIP thread.The priority value itself is platform-dependent, but is passed tosys_thread_new() when the thread is created.*/

#ifndef DEFAULT_THREAD_PRIO

#define DEFAULT_THREAD_PRIO 3

#endif

#define LWIP_DEBUG

#ifdef LWIP_DEBUG

#define U8_F "c"

#define S8_F "c"

#define X8_F "02x"

#define U16_F "u"

#define S16_F "d"

#define X16_F "x"

#define U32_F "u"

#define S32_F "d"

#define X32_F "x"

#define SZT_F "u"

#endif

#define TCPIP_MBOX_SIZE 32

#define TCPIP_THREAD_STACKSIZE 1024

#define TCPIP_THREAD_PRIO 8

/*DEFAULT_RAW_RECVMBOX_SIZE: The mailbox size for the incoming packets on aNETCONN_RAW. The queue size value itself is platform-dependent, but is passedto sys_mbox_new() when the recvmbox is created.*/

#define DEFAULT_RAW_RECVMBOX_SIZE 12

/*DEFAULT_UDP_RECVMBOX_SIZE: The mailbox size for the incoming packets on aNETCONN_UDP. The queue size value itself is platform-dependent, but is passedto sys_mbox_new() when the recvmbox is created.*/

#define DEFAULT_UDP_RECVMBOX_SIZE 12

/*DEFAULT_TCP_RECVMBOX_SIZE: The mailbox size for the incoming packets on aNETCONN_TCP. The queue size value itself is platform-dependent, but is passedto sys_mbox_new() when the recvmbox is created. */

#define DEFAULT_TCP_RECVMBOX_SIZE 12

/**DEFAULT_ACCEPTMBOX_SIZE: The mailbox size for the incoming connections.The queue size value itself is platform-dependent, but is passed tosys_mbox_new() when the acceptmbox is created.*/

#define DEFAULT_ACCEPTMBOX_SIZE 12

#if (LWIP_DNS || LWIP_IGMP || LWIP_IPV6) && !defined(LWIP_RAND)

/* When using IGMP or IPv6, LWIP_RAND() needs to be defined to a random-function returning an u32_t random value*/

#include "lwip/arch.h"

u32_t lwip_rand(void);

#define LWIP_RAND() lwip_rand()

#endif

#endif /* __LWIPOPTS_H__ */

/*****END OF FILE****/

審核編輯：湯梓紅