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DSP app has poor performance when running as DSPLink application

Christopher Fury
Expert 1130 points
Other Parts Discussed in Thread: OMAP-L137

I'm in the process of porting an older DSP application to OMAP-L137.  I want to use DSPLink, but am getting some odd benchmarking.  The application runs significantly faster if I run it as a DSP only app in CCSv4.  If I place it in a DSPLink wrapper and try to execute it via PROC_load and PROC_start, is MUCH slower than it should be, by a factor of 2 or more.

I'm kind of stumped.  The app is running as a task, and there are no other tasks, software interrupts, or hardware interrupts set up in this app -- shouldn't it have full control of the processor?

Thanks,
Chris 

  • 0
    Expert 1130 points

    Ah ha!  I found the answer.  I changed my tcf file to store the program and data sections in the level 2 cache instead of SDRAM.  I may look at using the 128k of SRAM, not sure how that's configured.  Here's the code, for posterity:

    // configure the cache, making sure I have enough room in L2 for my code and data
    prog.module("GBL").C64PLUSL2CFG = "0k";
    prog.module("GBL").C64PLUSL1DCFG = "32k";
    prog.module("GBL").C64PLUSL1PCFG = "32k";

    // set up IRAM section to put code and data in.
    var IRAM = prog.module("MEM").instance("IRAM");
    IRAM.len = 262114;
    IRAM.createHeap = 1;

    // used to go to SDRAM, now set it to IRAM 
    bios.setMemCodeSections(prog, IRAM);
    bios.setMemDataNoHeapSections(prog, IRAM);
    bios.setMemDataHeapSections(prog, IRAM);

    Thanks,
    Chris 

     

  • 0 in reply to Christopher Fury
    TI__Expert 7250 points
    Glad to see this was resolved