[dm-crypt] multiple crypt devices not using multiple CPUs

Milan Broz gmazyland at gmail.com
Sun Dec 16 22:25:07 CET 2012


On 12/16/2012 10:04 PM, Brian J. Murrell wrote:
> Hi,
> 
> I guess I must be missing something.  I had understood that if one had
> multiple block devices being crypted by dm-crypt, if they were being
> operated on at the same time, their parallel crypto operations would
> utilize different CPUs.

In current kernels, work keeps on cpu which submitted it.

Please read
http://www.saout.de/pipermail/dm-crypt/2012-July/002582.html

(and try to run the second case with direct-io, iow add oflag=direct for dd)

m.


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