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I am running Bonnie benchmark on an embedded device and I am getting variable results for every run. I am contemplating using ionice and / or chrt to get around it. Can you suggest which option is better ? ionice or chrt ?

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What kernel and distribution are you using? Are you on a realtime kernel?

I typically don't use ionice because it never seems to work when used in conjunction with the kernel elevator settings in my setups (only for CFQ). However, you can try a run of Bonnie++ with something like: chrt -f 75 bonnie++ to use the FIFO scheduler with realtime priority 75. Repeat with realtime priority 95.

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