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Slow c674x DSPLIB performance

William Schaecher
Prodigy 30 points

I am getting slower that expected performance from the c674x-DSPLIB. I expect a multiply-add (dot-product) to take about 10 ns @ 300MHz, yet it is taking 120 ns. Do I have a setup problem?

  • 0
    TI__Mastermind 43955 points
    Hi William,

    What is you mode of measurement? Do you use CCS clock and measure the time taken to execute the instructions?

    Regards,
    Shankari
  • 0
    TI__Mastermind 35645 points

    Hi William,

    Thanks for your post.

    It seems that the benchmarking for this DSPLIB kernel was done earlier in the CCSv3.3 environment on a cycle accurate simulator using  C6000 CGT version 6.1.9 and I believe, the performance numbers wouldn't vary with other CCS versions too. After loading CCS, select Profile->Clock->Enable and this will allow the kernel demonstration apps to accurately display cycle counts.

    May be, you could refer the c674x floating & fixed point benchmark performance numbers for vector dot product and kindly ensure the expected performance and evaluate on the same:

    http://www.ti.com/lsds/ti/dsp/c6000_dsp/c674x/benchmarks.page#vector

    http://www.ti.com/lsds/ti/dsp/c6000_dsp/c674x/benchmarks.page#vector2

    Please compare your performance results with the above benchmark metrics.

    Thanks & regards,

    Sivaraj K

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