On Tue, Jan 12, 2016 at 06:31:19PM -0500, Mikulas Patocka wrote:
> On Mon, 4 Jan 2016, Mark Brown wrote:

> > The main thing the out of tree req-dm-crypt code is doing was using a
> > larger block size which does seem like a reasonable thing to allow
> > people to tune for performance tradeofffs but I undertand that's a lot
> > harder to achieve in a good way than one might hope.

> But as Milan pointed out, that larger block size doesn't work if you 
> process requests with different sizes - the data encrypted with one 
> request size won't match if you decrypt them with a different request 
> size.

Sure, you need to fix that block size.

> Does the hardware encryption you are optimizing for allow setting 
> arbitrary tweaks in XTS mode? What is the specific driver you are 
> optimizing for?

This isn't targeted at a specific driver or system, it's trying to make
dm-crypt better able to make use of hardware acceleration in general.