Hi Milan,

On 10 April 2017 at 19:30, Milan Broz [off-list ref] wrote:

Thank you for the reply.

Well, it is good that there is no performance degradation but it
would be nice to have some user of it that proves it is really
working for your hw.

I have been able to get access to a hardware with IV generation support
a few days back. The hardware I was having before did not have IV
generation support. Will be able to come up with numbers after making
it work with the new one.

FYI - with patch that increases dmcrypt sector size to 4k
I can see improvement in speed usually in 5-15% with sync AES-NI
(depends on access pattern), with dmcrypt mapped to memory
it is even close to 20% speed up (but such a configuration is
completely artificial).

I wonder why increased dmcrypt sector size does not work for your hw,
it should help as well (and can be combiuned later with this IV approach).
(For native 4k drives this should be used in future anyway...)

I think it should work well too with backward incompatibility.

Thanks,
Binoy