One more on that, which I've just thought about: On Thu, 2013-07-04 at 18:07 -0400, Phil Turmel wrote: > I believe dmcrypt is single-threaded, too. Even if that is still true... and it with dmcrypt below MD it would run with _one_ thread _per_ physical device... while the other way round (dmcrypt on top of MD) it would run with _only one_ thread over the _whole_ MD device (and thus also all disks)... ...would the former really give a performance benefit (or wouldn't it be actually much worse). Since even though you'd have one dmcrypt thread per disk now,... each of them would have to en/decrypt the "same" actual data for different devices... so while you have 4x threads... you need to do 4x en/decryption works. Which wouldn't be the case when having dmcrypt on top of MD... sure you'd only have one thread... Does that sound reasonable? Cheers, Chris.
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