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Issue about Cortex-A9 Dhrystone performance

Ying-Han Chen

Hi,

We found the following document on Cortex-A9 performance.

List of ARM microarchitectures - Wikipedia, the free encyclopedia

Which claims 2.5 DMIPS/MHz per core for Cortex-A9 2GHz@2 core. However, our Dhrystone result on Cortex-A9 1.2GHz@2 core only showed roughly 1 DMIPS/MHz per core.

We downloaded the Dhrystone benchmark from the following link and cross-compiled it with gcc version 4.5.2.

dhrystone 2.1 - Download, Browsing & More | Fossies Archive

We realize that Dhrystone measurements will vary due to differences in compilers and OS. And I would like to know whether our result is reasonable or not?

Best,

Ying

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  • 0

    Hi Winand

    you are going in wrong direction about DMIPS per MHZ, the calculation that you have done is at mistake. 2.5 DMIPS/MHz is independent of your frequency now. still you now have 800 MHz but it does not mean that 2.5DMIPS/MHz will chnage to 1.66DMIPS/MHZ.

    it is fixed . either it is 1200 MHZ, 2GHZor 800 MHz

Reply
  • 0

    Hi Winand

    you are going in wrong direction about DMIPS per MHZ, the calculation that you have done is at mistake. 2.5 DMIPS/MHz is independent of your frequency now. still you now have 800 MHz but it does not mean that 2.5DMIPS/MHz will chnage to 1.66DMIPS/MHZ.

    it is fixed . either it is 1200 MHZ, 2GHZor 800 MHz

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