lwip memory and full speed throughput test.
Dependencies: EthernetInterface mbed-rtos mbed
This project represents a throughtput test for the EthernetInterface, based on the lwIP library.
The purpose of this is to be able to make a comparison of full speed (Rx,Tx and Rx+Tx) and memory
between the EthernetInterface based on the lwIP and the one based on PicoTCP.
The benchmark consists of three parts:
- we are sending 1 Megabyte from the board to host
- we are waiting for the host to send us 1 Megabyte of data
- on the last part we are using a TCP Echo Server to send and receive back 1 Megabyte of data
we send/receive 1024 packets of 1024 bytes each and we measure how many bits per second we transmit and receive.
The result:
TX+RX Throughput: 4194304 bytes in 41 seconds (0.774) Mbits/s
Memory report
Current free memory : 22644 bytes
Maximum free memory : 24716 bytes
Minimum free memory : 22644 bytes
Average free memory : 22644 bytes
The python script used
#!/usr/bin/python import sys, socket import random, string import select from time import time #ECHO_SERVER_ADDRESS = "10.20.30.139" ECHO_SERVER_ADDRESS = "192.168.100.12" ECHO_SERVER_PORT = 7 N_PACKETS = 1024 LEN_PACKET = 1024 TOT_BITS = (LEN_PACKET * N_PACKETS * 8) * 4. # TX bits + RX bits PACKET = ''.join(random.choice(string.ascii_uppercase+string.digits) for _ in range(LEN_PACKET)) MEGA = 1024 * 1024. UPDATE_STEP = (N_PACKETS/20) # Make the update step such as one step = 5% UPDATE_R_STEP = (N_PACKETS/20) #Make the update step such as one step = 1% s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((ECHO_SERVER_ADDRESS, ECHO_SERVER_PORT)) start = time() rx_total = 0 tx_total = 0 data = '' i = 0 lp = [] p = select.poll() while(True): # keeping this in for robustness testing, when the test will run for days #Stage I - sending data from host towards mbed board print "Started sending data...." while (i < N_PACKETS): p.register(s, select.POLLOUT) lp = p.poll(1) if (len(lp) > 0): s.sendall(PACKET) i+=1 if (i % UPDATE_STEP) == 0: print "sent %d/%d (%.2f%%)" % (i, N_PACKETS, float(i)/ float(N_PACKETS) * 100.) continue #Stage II - receving data from the mbed board print "Started receiving data...." while(len(data) < N_PACKETS * LEN_PACKET): p.register(s, select.POLLIN) lp = p.poll(1) if(len(lp) > 0): r = s.recv(LEN_PACKET) if (r != ''): data += r if (len(data) / LEN_PACKET) % UPDATE_R_STEP: print "recvd %d/%d (%.2f%%)" % (len(data)/LEN_PACKET, N_PACKETS, float(len(data))/ float(N_PACKETS * LEN_PACKET) * 100.) else: print "Error receiving !" sys.exit(1) #Stage III - echo between host and mbed board print "Started echoing data...." for i in range(N_PACKETS): if (i % UPDATE_STEP) == 0: print "%.2f%%" % (float(i)/float(N_PACKETS) * 100.) s.sendall(PACKET) data = s.recv(LEN_PACKET) if (len(data) != LEN_PACKET): print "Error echoing !" sys.exit(1) print "Test was finished!" break; t = time() - start s.close() print "TX+RX Throughput: %d bytes in %d seconds (%.3f)Mbits/s" % (TOT_BITS / 8, t, ((TOT_BITS / t) / MEGA))
This test is based on the following libraries
Import librarymbed-rtos
Official mbed Real Time Operating System based on the RTX implementation of the CMSIS-RTOS API open standard.
Import libraryEthernetInterface
mbed IP library over Ethernet
Click here to see the results for PicoTCP
Diff: main.cpp
- Revision:
- 1:fd8283c28901
- Parent:
- 0:bfe7b0aefe02
--- a/main.cpp Mon Jul 08 12:25:13 2013 +0000 +++ b/main.cpp Tue Jul 09 08:34:28 2013 +0000 @@ -7,6 +7,7 @@ struct MemoryUsage { + uint32_t curFreeRam; uint32_t minFreeRam; uint32_t maxFreeRam; uint32_t avgFreeRam; @@ -14,7 +15,7 @@ uint32_t cntSamples; }; -struct MemoryUsage memoryStats = {0xFFFFFFFF,0,0,0}; +struct MemoryUsage memoryStats = {0,0xFFFFFFFF,0,0,0}; int fakePrintf(void* pvHeapInfo, char const* pFormatString, ...) { @@ -26,7 +27,7 @@ { va_start(valist, pFormatString); unsigned long freeSize = va_arg(valist, unsigned long); - + memStat->curFreeRam = freeSize; if(memStat->minFreeRam > freeSize) memStat->minFreeRam = freeSize; @@ -42,6 +43,21 @@ return 0; } +void inline printMemoryStats(void) +{ + if(memoryStats.cntSamples == 1) + printf("\n\n***** Initial Memory Report *****\n"); + else + printf("\n\n********* Memory Report *********\n"); + + printf("Current free memory : %d bytes\n",memoryStats.curFreeRam); + printf("Maximum free memory : %d bytes\n",memoryStats.maxFreeRam); + printf("Minimum free memory : %d bytes\n",memoryStats.minFreeRam); + printf("Average free memory : %d bytes\n",memoryStats.avgFreeRam); + printf("Stack pointer address : %d\n",memoryStats.stackPointer); + printf("****************************\n"); +} + void inline memoryStamp(void) { __heapstats((__heapprt)fakePrintf, &memoryStats); @@ -55,7 +71,12 @@ int main() { printf("Ethernet Interface memory test....\n"); + + // Initial memory status + memoryStamp(); stackPtrSnapshot(); // snapshot of the stack pointer before starting benchmark to see the SP. + printMemoryStats(); + EthernetInterface eth; int connections = 0; eth.init(); //Use DHCP @@ -150,16 +171,16 @@ if((dataReceived+dataSent) < 2*BUFFER_QUANTITY) { printf("Echo test has failed.Exiting connection...\n"); - break; } else { printf("Echo test has passed...\n"); } + break; } client.close(); - printf("Memory report after connection....\n"); - printf("Max memory : %d bytes\nMin memory : %d bytes\nAverage memory : %d\n",memoryStats.maxFreeRam,memoryStats.minFreeRam,memoryStats.avgFreeRam); + printf("Test was finished...\n"); + printMemoryStats(); } return 0;