David Fuchs wrote: > In short, the write speed plummets to around 160 MB/s, as opposed to 270 > MB/s on the naked partition; read speed is at 115 MB/s (slower than writing > - no idea why), as opposed to 465 MB/s on the bare partition. (I've pasted > the results below.)
I don't have an immediate answer but I do have a comment. You are comparing raw partition I/O of /dev/sdd6 and talking about encryption but I think you are actually using encryption + lvm. Is lvm in there? You didn't quite describe your configuration fully. What is your /dev/mapper/test attached to? If lvm then it would be a useful data point to compare an lvm only benchmark as well. Then you would see how much of a hit is imposed by each of encryption and lvm separately. It is possible that your hit is only due to lvm. And if you are not using encryption + lvm then that is another suggestion. I normally use encryption with lvm. When I previously benchmarked this on a ThinkPad T42 laptop way back in the day I didn't get anywhere near the performance hit you are reporting now. I was using encryption + lvm. Of course then the top end high speed was only a fraction of your bottom end slow speed so maybe times have simply changed. Bob
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