Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I have an embedded linux device and I would like to know the baseline for various operations on the device for e.g. memory read , memory write, movinand read and write etc. Is there a way to find the baseline speeds for these operations on the device ?
Read the datasheets for the various devices and do some math.
For example, if you have 32 bit SDRAM running at 50MHz, with CAS latencies of 4-1-1-1, and you can burst, then you know it will take 7 clocks to transfer 4 words (16 bytes). There will probably be an idle period of 1 clock also, so it’s really 8 clocks for the 16 bytes, or 2 bytes for every clock, which at 50MHz is 100MB/s. Now, you should really subtract the time it spends refreshing the memory, etc.
There’s really no way to know what the performance should be without reading specs and doing the math.