[dm-crypt] dm-crypt multithreaded yet?

Marc MERLIN marc at merlins.org
Thu Aug 9 05:17:58 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.

If that helps, my 500MB/s SSD is giving me 270MB/s when reading an encrypted
file (i.e. going through the block and the filesystem layer) on my laptop:
Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz

Marc
-- 
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
                                      .... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/  
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