measure memory bandwidth on Atom processor

[DZhen3]

Hi,

I hope this is a right place for me to ask this question. I try to measure the memory bandwidth on the Atom processor. The frequency of the front end bus is 533MHz and I use DDR2-667. In theory, the memory bandwidth is limited by the front end bus and the maximum memory bandwidth is 4.16GB/s. The memory bandwidth I measured with SiSoftware Sandra and my own C program (with memcpy in GNU C library in Linux) is 2.6GB/s. I don't understand why there is such difference. The bandwidth I measured is the real bandwidth in the system? Another question is: can read requests conflict with write requests when both are issued to the FSB? I'm thinking maybe this is the reason I cannot get the theoretical maximal throughput of FSB. Best,Da

[FMcNu1]

Wecome to the Intel® Embedded Community.

I want to make you aware of a special place to go with questions like yours. The Intel® e-Help desk is staffed by Intel representatives who support select Intel embedded platforms including Intel Atom™ .

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If you are not already a Privileged member, you can request an upgrade to your community account here:

https://edc.intel.com/My-Account.aspx https://edc.intel.com/My-Account.aspx

In addition to access to e-Help, Prvileged members may also access the confidential content within the Intel® Embedded Design Center, such as design documents, specifications, and training materials.

I hope this helps.

Felix

J. Felix McNulty

Community Moderator (Intel contractor)