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dm8168 iram问题

eric eric3
Intellectual 900 points


软件环境：dvr_rdk2.0    dsp-C674x

问题：在dm8168中，将程序完全放入iram中运行和在dsp外部内存中运行，耗时基本一致,why????

在cfg中，iram部分的内存配置如下：

Program.sectMap[".internalHeap"]              = "DSP_L2_RAM";  

heapMemParams.size = 0x00020000;
heapMemParams.sectionName = ".internalHeap";
var heap1 = HeapMem.create(heapMemParams);

Program.global.DSP_HEAPINT_MEM = heap1;

/* Configure DSKT2 heaps and scratch */
DSKT2.ALLOW_EXTERNAL_SCRATCH = false;

DSKT2.DARAM0 = "DSP_HEAPINT_MEM";

["DSP_L2_RAM", {
comment: "DSP_L2_RAM",
name: "DSP_L2_RAM",
base: 0x10800000,
len: 0x00020000
}],

l1PMode: "32k",
l1DMode: "32k",
l2Mode: "128k"

  • 0
    TI__Guru**** 155073 points

    你好，

    我认为是cache的原因。你可以disable 所有的cache，然后比较，应该是DDR比较慢。

  • 0 回复 Chris Meng
    Intellectual 900 points

    你 好，

    cache我是有开的，开启如下：

    var Cache = xdc.useModule('ti.sysbios.family.c64p.Cache');
/* Disable caching for HWspinlock addresses */
Cache.MAR0_31    = 0x00000000;
Cache.MAR32_63   = 0x00000000;
/* Config/EDMA registers cache disabled */
Cache.MAR64_95   = 0x00000000;
Cache.MAR96_127  = 0x00000000;
Cache.MAR128_159 = 0xff800000;
/* TILER memory cache disabled  - 0xA0000000*/
Cache.MAR160_191 = 0x00000000;
/* memory cache disabled  - 0xC0000000*/
Cache.MAR192_223 = 0x00000000;
/* memory cache disabled  - 0xE0000000*/
Cache.MAR224_255 = 0x00000000;

Cache .initSize =  {
      l1pSize: Cache.L1Size_32K,
      l1dSize: Cache.L1Size_32K,
      l2Size: Cache.L2Size_128K
};
    不开启Cache .initSize的内容的话，的确会比开启的慢一点，但是效果还是不明显，这不应该呀，iram开启的话，效率应该是有很大的提升的，我测试iram和外部内存效率的程序如下：
        unsigned long long tDiff = 0;
    unsigned long long t;
    unsigned char * ptrBuf =  shareMemoryParams->byBuf; //指向外部内存
    unsigned char * ptrIram = iram_ctx->byReusable; //指向iram
    unsigned char tmp ;
    int j;
    memset(ptrBuf , 255 ,imgWH* sizeof(unsigned char));
    memset(ptrIram , 255 ,imgWH* sizeof(unsigned char));
    //int nSum , x1,y1;
    t = Utils_getCurTimeInUsec();
    PRINT("ptrIram t1 = %ld \n",t );

    for(i = 0;i < imgWH -1;i++)
    {
        tmp =  ptrIram[i] - 1 ;
        ptrIram[i] = tmp;
    }

    PRINT("ptrIram t2= %ld \n",Utils_getCurTimeInUsec() );
    tDiff = Utils_getCurTimeInUsec() - t  ;
    PRINT("ptrIram tDiff2 = %ld \n",tDiff );

    t = Utils_getCurTimeInUsec();
    PRINT("ptrBuf t1 = %ld \n",t );

    for(i = 0;i < imgWH -1;i++)
    {
        tmp =  ptrBuf[i] - 1;
        ptrBuf[i] = tmp;
    }


    PRINT("ptrBuf t2= %ld \n",Utils_getCurTimeInUsec() );
    tDiff = Utils_getCurTimeInUsec() - t;

    PRINT("ptrBuf tDiff1 = %ld \n",tDiff);