Hi, Aaronwu!

Thanks for your reply.

here is the application:

1. one thread:

  open the file:

   m_pVNet->Lock();

  pf = fopen(FileName, "rb");

   m_pVNet->WaittoUnLock();

read the file in one thread:

while(1) {

  if (!m_Holt) {

   for (unsigned int i=0; i<4; i++) {

    if (m_ReadRecode[i].Addr.nIp !=0 ) {

     if (m_ReadRecode[i].Ack == 1) {

      m_pVNet->Lock();

      m_ReadRecode[i].Packet.len = fread(m_ReadRecode[i].Packet.value, 1, MAX_PACKET_SIZE, m_ReadRecode[i].pf);

      m_pVNet->WaittoUnLock();

      m_ReadRecode[i].Packet.index++;

      m_ReadRecode[i].Ack = 0;

      m_ReadRecode[i].lostnums = 0;

     }

     else if (++m_ReadRecode[i].lostnums >= 400) {

      m_ReadRecode[i].Addr.nIp  = 0;

      m_pVNet->Lock();

      fclose(m_ReadRecode[i].pf);

      m_pVNet->WaittoUnLock();

      continue;

     }

     if (m_ReadRecode[i].lostnums%20 == 0) { // 每160ms上传一次

      addr_remote.sin_addr.s_addr = m_ReadRecode[i].Addr.nIp;

      addr_remote.sin_port = m_ReadRecode[i].Addr.nPort;

      sendto(m_pVNet->m_pDoc->m_Sock, &m_ReadRecode[i].Packet, m_ReadRecode[i].Packet.len+12, 0,

        (struct sockaddr*)&addr_remote, sizeof(addr_remote));

      if (m_ReadRecode[i].Packet.len == 0) {

       m_ReadRecode[i].Addr.nIp  = 0;

       m_pVNet->Lock();

       fclose(m_ReadRecode[i].pf);

       m_pVNet->WaittoUnLock();

      }

     }

    }

   }

  }

  usleep(4000);

}

2.another thread read by FFMPEG

   m_pVNet->Lock();
  if (av_open_input_file(&pFormatCtx, m_FileName, NULL, 0, NULL) != 0) {
    m_pVNet->WaittoUnLock();
    goto EXIT1;
   }

   if (av_find_stream_info(pFormatCtx) < 0) {
    m_pVNet->WaittoUnLock();
    goto EXIT2;
   }
   m_pVNet->WaittoUnLock();

     .

     .

     .

   while (m_Run) {
    unsigned char mask = (1<<6);

    m_pVNet->Lock();
   ret = av_read_frame(pFormatCtx, &packet);
    m_pVNet->WaittoUnLock();
     .

     .

     .   

      if (sendcount >= 15) { // 2.4s内无应答
       m_Run = 0;
       break;
      }
     }
    }
    av_free_packet(&packet);
   }
   av_free(pPacketMsg);
EXIT2:
   m_pVNet->Lock();
   av_close_input_file(pFormatCtx);
   m_pVNet->WaittoUnLock();
EXIT1:
   if (m_OtherFile == 0)
    m_AddrInfo.nIp = 0;
   else
    usleep(100000);

to this porblem, I take a lock in 12 ms times after a read operation .

I use "bonnie++", the result is here:

Version  1.94       ------Sequential Output------ --Sequential Input- --Random-

Concurrency   1     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--

Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP

blackfin       300M    43  91   809   5   410   2   111  83   870   2  60.6   2

Latency               509ms    1522ms    1350ms     153ms   81767us    1158ms

Version  1.94       ------Sequential Create------ --------Random Create--------

blackfin            -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--

              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP

                 16     7  96    14  96    54  95    11  95    14  96    12  93

Latency               391ms     164ms     104ms     208ms     156ms     618ms

1.93c,1.94,blackfin,1,507585383,300M,,43,91,809,5,410,2,111,83,870,2,60.6,2,16,,,,,7,96,14,96,54,95,11,95,14,96,12,93,509ms,1522ms,1350ms,153ms,81767us,1158ms,391ms,164ms,104ms,208ms,156ms,618ms

Hi, Aaronwu!

Thanks for your reply.

OK, I will test in other program, but My board is not suitable for ADI board, SD_SPI is simulation by SPORT.

I will post test code and the result.

     thanks!

     --chenza

Hi, Aaronwu!

I use test code, every thing is ok, there are must be something mistake in my application program.

     thanks you, very much.

--chenza

/*
* test.c
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <pthread.h>
#include <string.h>

#define FILE_NAME "/mnt/fat/86-02-01_0753_A.mp4"
#define SIZE1 1400
#define SIZE2 1500

void  *read2_thread(void)
{
FILE *fd;
fd = fopen(FILE_NAME, "rb");
if (fd == NULL) {
  printf("thread2 Open file err\n");
  return (void *)NULL;
}

while (1) {
  int len;
  char value[SIZE2];

  len = fread(value, 1, SIZE2, fd);
  if (len < SIZE2) {
   printf("thread2 read end, len is 0x%x\n", len);
   rewind(fd);
  }
//  else
//   printf("thread2 read one packet success\n");

  usleep(16000);
}
fclose(fd);

return (void *)NULL;
}

int main(void)
{
pthread_t read2;
pthread_create(&read2, NULL, (void *)read2_thread, NULL);

FILE *fd;
fd = fopen(FILE_NAME, "rb");
if (fd == NULL) {
  printf("Open file err\n");
  return -1;
}

while (1) {
  int len;
  char value[SIZE1];

  len = fread(value, 1, SIZE1, fd);
  if (len < SIZE1) {
   printf("thread1 read end, len is 0x%x\n", len);
   rewind(fd);
  }
//  else
//   printf("thread1 read one packet success\n");

  usleep(12000);
}
fclose(fd);

return 0;
}

解决问题：是电源的问题，我使用了二级LM2596，在示波器上看不出什么问题(可能示波器不够高级)，稳压的电源对SD卡影响很大，读与写都可能造成问题，最后将LM2596分开，仅一级稳压即解决了问题。