[dm-crypt] dm-crypt multithreaded yet?

Thomas Bächler thomas at archlinux.org
Wed Aug 8 17:31:27 CEST 2012

Am 08.08.2012 16:29, schrieb Brian J. Murrell:
> I thought I knew the answer to this question (dm-crypt multithreaded
> yet? no) but I had read in several places that dm-crypt had gained
> multithreaded capabilities.  I'm still skeptical though.  I certainly
> don't see it on Fedora 17's 3.3.4-5.fc17.x86_64 kernel.
> Sadly, I don't have an AES-NI capable CPU, but I do have 4 (real, 8 with
> HT enabled) cores and dm-crypting on my SSD reduces its performance down
> from about 260MB/s (native) to 95MB/s.  :-(  I would like to think I
> could get more performance out of it if more of the (usually available
> anyway) CPU could be thrown at it.

This is in 2.6.38 and later, I think:


The commit message also explains why you don't notice it.

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