CCS/PROCESSOR-SDK-DRA8X-TDA4X: appUdmaCopy2D cost time too big

HI :Sivaraj R

     i     just    tyr   to  compear   time  cost  of     appUdmaCopy2D    and    memcpy，    i    think   UDMA  should   de   faster    than    memcpy.

    here    is    a    table     i   list       times      of    diffrent   datasize .       i    think  time  of    appUdmaCopy2D  is   too  big. 

Thanks

Shuai

Hi :Sivaraj R

       here   is   some    data   about   it!appUdmaCopy2D 性能统计.xlsx

Hi   :Sivaraj R

in   TDA2     EDMA_UTILS_memcpy2D   is  faser   than   memcpy,     also   faster   than  appUdmaCopy2D

Hi :Sivaraj R

      for    better throughput   ,    which    sample   should    i     refer to?

     Thanks

Shuai

HI:Sivaraj R

     I     have  try     DRU    it   is   also   slow   than   EDMA  in   TDA4  ,     copy     1K      data      EDMA    is  about  1.5us  but       DRU  use   18us.

  in    my   code    i  have   to   copy     data   between   DDR  and  L2   ,  data  is  small  than  1k   In most cases.   so   have   to   make   UDMA   faster?

Thanks!

Shuai

slow   than   EDMA  in   TDA2

Hi,

Can you share the changes done to trigger UDMA DRU channel?

May be we are including the entire channel setup in the test.

If we know the transfer size well in advance we can submit TR up front and then trigger UDMA with a single API.

This is show cased in DMA utils of UDMA.

Regards

Sivaraj R

HI:Sivaraj R

          pdk\packages\ti\drv\udma\examples\udma_dru_test

         I     have  test   this   sample .      copy    1K   data     it   take    18us   and      copy    64K   data     it   take    48us.    for   litter  data   it's  efficiency     relatively low .

       i     test    EDMA   in   TDA2   copy      1K    data    edma   use   1.53us.

Thanks!

Shuai

Hi Shuai,

Could you please share the code that you are using to measure the performance? we think there is still something in code that gets added in performance measurement..

Regards,

Brijesh

Hi:Brijesh

      i    use    pdk\packages\ti\drv\udma\examples\udma_dru_test      test   DRU ,     follow   is   my    code   ,     

static int32_t App_memcpyTest(Udma_ChHandle chHandle)
{
    int32_t             retVal = UDMA_SOK;
    uint32_t            i;
    uint32_t            loopCnt = 0U;
    uint8_t            *srcBuf = &gUdmaTestSrcBuf[0U];
    uint8_t            *destBuf = &gUdmaTestDestBuf[0U];

    /* Init buffers */
    for(i = 0U; i < UDMA_TEST_APP_NUM_BYTES; i++)
    {
        srcBuf[i] = i;
        destBuf[i] = 0U;
    }
    printf("i = %d,UDMA_TEST_APP_NUM_BYTES=%d\n", i, UDMA_TEST_APP_NUM_BYTES);
    /* Writeback source and destination buffer */
    Udma_appUtilsCacheWb(&gUdmaTestSrcBuf[0U], UDMA_TEST_APP_NUM_BYTES);
    Udma_appUtilsCacheWb(&gUdmaTestDestBuf[0U], UDMA_TEST_APP_NUM_BYTES);
    uint64_t   currentTS = 0;
    uint64_t   start = 0;
    start = TimerP_getTimeInUsecs();
    while(loopCnt < UDMA_TEST_APP_LOOP_CNT)
    {
        /* Perform UDMA memcpy */

        retVal = App_udmaMemcpy(
                     chHandle,
                     destBuf,
                     srcBuf,
                     UDMA_TEST_APP_NUM_BYTES);
    //    memcpy(destBuf, srcBuf, UDMA_TEST_APP_NUM_BYTES);

        //Udma_appUtilsCacheInv(&gUdmaTestDestBuf[0U], UDMA_TEST_APP_NUM_BYTES);
        //if(UDMA_SOK == retVal)
        //{
        //    /* Compare data */
        //    /* Invalidate destination buffer */

        //    for(i = 0U; i < UDMA_TEST_APP_NUM_BYTES; i++)
        //    {
        //        if(srcBuf[i] != destBuf[i])
        //        {
        //            App_print("[Error] Data mismatch!!\n");
        //            retVal = UDMA_EFAIL;
        //            break;
        //        }
        //    }
        //}

        if(UDMA_SOK != retVal)
        {
            break;
        }

        loopCnt++;
    }
    currentTS = TimerP_getTimeInUsecs();
    printf("Cycles - Using DMA = %llu\n", (currentTS - start));
    return (retVal);
}
 

100     times    copy    1K   data     cost   1019us

Thanks!

Shuai

Hello Mr Shuai,

Are you facing this issue? What is the value of  UDMA_TEST_APP_NUM_BYTES, i mean did you change it from default application?

Rgds,

Brijesh