TDA4VM: Any API to ask MSMC to prefetch?

Ming Zhong10

Part Number: TDA4VM

Dear experts,

Is there any API/assembly or register that we can ask MSMC to prefetch/control the MSMC cache prefetch?

Backgroud: our customer is working on optimizing A72 algorithm(mainly memcpy performance), and MSMC cache will be helpful to reduce memory access delay.

Thanks & Best Regards!

over 4 years ago

0 Keerthy J over 4 years ago

TI__Guru**** 163290 points

Hi ZM,

Just few additional questions to have a precise understanding of the optimization customer is trying to do.

Ming Zhong10 said:
our customer is working on optimizing A72 algorithm(mainly memcpy performance), and MSMC cache will be helpful to reduce memory access delay.

Now that you mention memcpy, are the source destination buffers in MSMC SRAM?
Is there no involvement of DDR in the above use case?

Best Regards,
Keerthy

0 Ming Zhong10 over 4 years ago in reply to Keerthy J

TI__Intellectual 2235 points

memcpy from DDR to DDR. If DDR data are cached as requested, it will be helpful to reduce time.

0 Keerthy J over 4 years ago in reply to Ming Zhong10

TI__Guru**** 163290 points

Hi ZM,

Can this issue be resolved with the information provided over e-mail?

Best Regards,
Keerthy

0 Ming Zhong10 over 4 years ago in reply to Keerthy J

TI__Intellectual 2235 points

Thanks Keerthy for tracking.

To do prefetch on MSMC, you should use DRU. it is called cache warm up. You need to configure TR and submit to DRU.

Thanks & Best Regards!

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TDA4VM: Any API to ask MSMC to prefetch?