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Use CPU(KL) to run FFT of Intel IPP takes longer than CPU(HL)

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Customer uses related Fast Fourier Transform(FFT) part of Intel Integrated Performance Primitives(IPP) to get calculated result (Please refer attached file).
Why use a new generation of CPU (Kaby Lake)) to run FFT of Intel IPP will takes longer than the previous generation of CPU (Haswell)? Could you expain this phenomenon? Thanks.

 

 

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Downloadimage/pngFFT_IPP.png153.72 KB

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