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cycles numbers measurment of EDMA based SYS/BIOS examples under EDMA_LLD

ZAKARIA BOURZOUK
Intellectual 560 points

I based on the code of edma3 with sysbois provided  by TI  to transfer a 32-bit integer data block MSMCSRAM memory of a DSP6678 to MSMCSRAM  memory of another DSP6678 with PCIE protocol, and I want to know the locations where I should put the counters to measure the number of cycles consumed.

  • 0
    TI__Mastermind 35645 points

    Hi,

    Thanks for your post.

    In general, if the goal is to measure the number of CPU cycles expired... a simple (and I think most accurate) option , please see to look for any timestamp counter register values available for C66x devices.  In case, if available, note these register values, run to a breakpoint, and note the new cycle counts.

    We have C66x PCIE throughput results under www.ti.com/lit/pdf/sprabk8, the EDMA result is around 5-6 Gbps and there is no CPU results, because for high throughput EDMA is needed.

    Thanks & regards,

    Sivaraj K

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  • 0 in reply to Sivaraj Kuppuraj
    Intellectual 560 points
    Thank you for your reply, please in fact i use edma3_test function provided by TI and want to know the locations where I should put the counters in it. I puted them as below, but it me gives for 256 bytes 12747 cycles with ACNT=128 bytes things that me appear illogical .The question is, are the counters in correct places or no ?


    Nbefore = Timestamp_get32();

    result = EDMA3_DRV_enableTransfer (hEdma, chId,
    EDMA3_DRV_TRIG_MODE_MANUAL);

    if (result != EDMA3_DRV_SOK)
    {
    printf ("edma3_test: EDMA3_DRV_enableTransfer " \
    "Failed, error code: %d\r\n", result);
    break;
    }

    /* Wait for the Completion ISR. */
    while (irqRaised1 == 0u)
    {
    /* Wait for the Completion ISR. */
    printf ("waiting for interrupt...\n");
    }

    Nafter = Timestamp_get32();