TI中文支持网1）FFTC user guide文档上说，若加入循环前缀去除操作，一个packet只能处理一个block，但是这种方法会大大降低FFT的处理速度，请问有什么好的办法吗？
2）根据DSP 6670的FFTC吞吐量测试的说明，需要用10个或20个packet使FFTC完全工作起来，怎么实现呢？又没哟具体的例子？我在evm6670上测试的单个packet消耗的cycle数就是7000多cycle，例子用的就是TI提供的
C:\ti\pdk_C6670_1_1_2_6\packages\ti\drv\fftc\example\
FFTC_Multicore_exampleProject
[C66xx_2] **************************************************
[C66xx_2] ******** FFTC Multi Core Example Start **********
[C66xx_2] **************************************************
[C66xx_2] Core 2 : L1D cache size 7. L2 cache size 0.
[C66xx_2] [Core 2]: Waiting for Sys Init to be completed …[C66xx_3] **************************************************
[C66xx_3] ******** FFTC Multi Core Example Start **********
[C66xx_3] **************************************************
[C66xx_3] Core 3 : L1D cache size 7. L2 cache size 0.
[C66xx_3] [Core 3]: Waiting for Sys Init to be completed …[C66xx_0] **************************************************
[C66xx_1] **************************************************
[C66xx_0] ******** FFTC Multi Core Example Start **********
[C66xx_1] ******** FFTC Multi Core Example Start **********
[C66xx_0] **************************************************
[C66xx_1] **************************************************
[C66xx_0] Core 0 : L1D cache size 7. L2 cache size 0.
[C66xx_1] Core 1 : L1D cache size 7. L2 cache size 0.
[C66xx_0] [Core 0]: FFTC instance 0 successfully initialized[C66xx_1] [Core 1]: Waiting for Sys Init to be completed …[C66xx_0] [Core 0]: FFTC successfully opened[C66xx_1] [Core 1]: FFTC successfully opened[C66xx_0] ——————————————–
[C66xx_1] ——————————————–
[C66xx_0] FFTC-CPPI Example START on Core 0[C66xx_1] FFTC-CPPI Example START on Core 1[C66xx_0] Sample Size: 16[C66xx_1] Sample Size: 16[C66xx_0] Number of Blocks: 5[C66xx_1] Number of Blocks: 5[C66xx_0] Tx Queue: 0[C66xx_1] Tx Queue: 0[C66xx_0] Descriptor Type: Host[C66xx_1] Descriptor Type: Host[C66xx_0] ——————————————–
[C66xx_1] ——————————————–
[C66xx_0] [Core 0]: Rx flow 0 opened successfully using Rx queue 708[C66xx_1] [Core 1]: Rx flow 1 opened successfully using Rx queue 709[C66xx_2] [Core 2]: FFTC successfully opened[C66xx_3] [Core 3]: FFTC successfully opened[C66xx_2] ——————————————–
[C66xx_3] ——————————————–
[C66xx_2] FFTC-CPPI Example START on Core 2[C66xx_3] FFTC-CPPI Example START on Core 3[C66xx_2] Sample Size: 16[C66xx_3] Sample Size: 16[C66xx_2] Number of Blocks: 5[C66xx_3] Number of Blocks: 5[C66xx_2] Tx Queue: 0[C66xx_3] Tx Queue: 0[C66xx_2] Descriptor Type: Host[C66xx_3] Descriptor Type: Host[C66xx_2] ——————————————–
[C66xx_3] ——————————————–
[C66xx_2] [Core 2]: Rx flow 2 opened successfully using Rx queue 710[C66xx_3] [Core 3]: Rx flow 3 opened successfully using Rx queue 711[C66xx_3][C66xx_3] [Core 3]: Submitting FFT Request …[C66xx_3] [Core 3]: Submitted request 0[C66xx_3][C66xx_3] [Core 3]: Waiting for Result …[C66xx_0][C66xx_1][C66xx_2][C66xx_0] [Core 0]: Submitting FFT Request …[C66xx_1] [Core 1]: Submitting FFT Request …[C66xx_2] [Core 2]: Submitting FFT Request …[C66xx_0] [Core 0]: Submitted request 0[C66xx_1] [Core 1]: Submitted request 0[C66xx_2] [Core 2]: Submitted request 0[C66xx_0][C66xx_1][C66xx_2][C66xx_0] [Core 0]: Waiting for Result …[C66xx_1] [Core 1]: Waiting for Result …[C66xx_2] [Core 2]: Waiting for Result …[C66xx_0] cycle=6636
[C66xx_1] cycle=7251
[C66xx_2] cycle=7250
Allen35065：
去CP的操作可能是会引起速率的下降，这也是没有办法的，当然如果多个packet连续送入的话因为FFTC内部的流水机制，速率不会下降太多。
FFTC内部是三个buffer的流水操作，一个packet要经历读数据，计算，写数据三部分，自然时延比较大；如果多个包持续送入，三个buffer可以流水作业，读数据和计算，写数据部分并行执行，就可以大大缩短每个包的平均时延，因此多个包连续做FFTC的时间总和要远远短于不连续的包的总和。
