Why the InvertPageDown/Up function do cache flush

[mark tsai]

Why the InvertPageDown/Up function need cache flush?

Wasn't it assume on a SMP system? 
Or will other testing thread use the page which the inversion thread use to do some io operation?

As when I remove the cache operation in  InvertPageDown/Up, the data inversion thread become 35% faster on my arm64 platform.

[Nick Sanders]

Since multiple passes of invert are done on the same page in sequence, and that page may be smaller than cache size. it's possible that the speedup is due to the inverts never actually making it to DRAM. It depends on your specific system config.

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[mark tsai]

Hi Nick,

> it's possible that the speedup is due to the inverts never actually making it to DRAM

I think you're right, I will try to do more investigation.

Thanks for your kindly reply!