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DSP performance lower than ARM performance.

Joaquim Duran
Prodigy 160 points
Other Parts Discussed in Thread: SYSBIOS

Dear all,

We're testing the DSP for data processing on a DM37x module from LogicPD. The module runs Linux. Running the test of matrix product from TI forums (http://e2e.ti.com/support/dsp/omap_applications_processors/f/447/p/70317/782636.aspx), we detect that the performance of ARM is higher that DSP. These are the results:

- Matrix 800x800 in DSP with no change of configuration in platform.tci = 34s

- Matriu 800x800 in DSP while activating data cache in platform.tci = 25s

- Matriu 800x800 in ARM = 18s.

We're exploring if the behavior could be a problem of DSP clock:

1 - The frequency of ARM processor could run at the frequencies 300, 600, 800 MHz or 1 GHz and the DSP, at 260, 520, 660 and 800 MHz. The frequency of the ARM could be configured from OS, Linux, it is possible to configure the frequency of DSP or it changes according to the frequency of ARM processor.

2 - Assuming that from ARM sends a 'long' task to the DSP. While the ARM is waiting for the result, is it possible that Linux decreases the frequency of ARM and consequently, it also decrease the frequency of DSP?

On the other hand, the libraries used to run the sample are:

- C6Run=0_98_03_03:
- DSPLINK_VERSION=1_65_01_06
- LPM_VERSION=1_24_03_11
- BIOS_VERSION=5_41_03_17
- XDCTOOLS_VERSION=3_16_03_36
- LINUXUTILS_VERSION=2_26_02_05
- SYSLINK_VERSION=2_00_02_80
- SYSBIOS_VERSION=6_32_01_38
- IPC_VERSION=1_23_03_31
- C6000 compiler: 6.1.4

Could you suggest anything else to test revise? Which is the optimal configuration for DSP?

Thanks and Best Regards,

Joaquim Duran 

  • 0
    TI__Guru 65405 points

    Hi Joaquim,

    The frequency of the C64x+ DSP is lower then the ARM. When the ARM running at 1 GHz the C64x+ DSP is on 800 MHz. You can use the advantages of the DSP if doing fixed point operations and using the optimized matrix multiply code that comes as part of the C64x+ DSPLib package which could be downloaded at the link:

    http://www.ti.com/tool/sprc265

    Look at makefile in the e2e thread which you are citing above about the usage of the libraries.

    BR

    Tsvetolin Shulev