[dm-crypt] unusual writing speeds when benchmark speeds are high enough

Arno Wagner arno at wagner.name
Mon Mar 18 11:20:21 CET 2013

On Mon, Mar 18, 2013 at 11:01:48AM +0100, Heinz Diehl wrote:
> On 18.03.2013, Matthias Schniedermeyer wrote: 
> > The SSD i have can reach (with encryption) about 400MB/s, but that is 
> > best-case performance when all moons are aligned. I haven't really 
> > benchmarked the real-world performance, the dd-example (with conv=fsync) 
> > only got 88MB/s.
> On all my SSD disks, cryptsetup performance is not even near that. I
> have about 450 MB/s without encryption, and max. 120 MB/s with. 

Remember that you can get a crypto-only benchmark with
"cryptsetup benchmark" from cryptsetup v.1.60 onwards. 

Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno at wagner.name
GnuPG: ID: CB5D9718  FP: 12D6 C03B 1B30 33BB 13CF  B774 E35C 5FA1 CB5D 9718
One of the painful things about our time is that those who feel certainty
are stupid, and those with any imagination and understanding are filled
with doubt and indecision. -- Bertrand Russell

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