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POWould a C6000 DSP be outperformed by a Cortex A9 for FP
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copied!<p>I'm using an OMAP L138 processor at the moment which does not have a hardware FPU. We will be processing spectral data using algorithms that are FP intensive thus the ARM side won't be adequate. I'm not the algorithm person but one is "Dynamic Time Warping" (I don't know what it means, no). The initial performance numbers are:</p> <blockquote> <p>Core i7 Laptop@ 2.9GHz: 1 second <br> Raspberry Pi ARM1176 @ 700MHz: 12 seconds <br> OMAP L138 ARM926 @ 300MHz: 193 seconds</p> </blockquote> <p>Worse, the Pi is about 30% of the price of the board I'm using!</p> <p>I do have a TI C674x which is the other processor in the OMAP L138. The question is would I be best served by spending many weeks trying to:</p> <ul> <li>learn the DSPLINK, interop libraries and toolchain not to mention forking out for the large cost of Code Composer or</li> <li>throwing the L138 out and moving to a Dual Cortex A9 like the Pandaboard, possibly suffering power penalties in the process.</li> </ul> <p>(When I look at FPU performance on the A8, it isn't an improvement over the Rasp Pi but Cortex A9 seems to be).</p> <p>I understand the answer is "it depends". Others here <a href="https://stackoverflow.com/a/15518347">have said</a> that "you unlock an incredible fast DSP that can easily outperform the Cortex-A8 if assigned the right job" but for a defined job set would I be better off skipping to the A9, even if I had to buy an external DSP later? </p>

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