Re: [Qemu-block] [Qemu-devel] [PATCH v2 3/5] iotests: reduce PBKDF iterations when testing LUKS

[Eric Blake]

On 01/03/2017 11:04 AM, Daniel P. Berrange wrote:
> By default the PBKDF algorithm used with LUKS is tuned
> based on the number of iterations to produce 1 second
> of running time. This makes running the I/O test with
> the LUKS format orders of magnitude slower than with
> qcow2/raw formats.
> 
> When creating LUKS images, set the iteration time to
> a 10ms to reduce the time overhead for LUKS, since
> security does not matter in I/O tests.
> 
> Previsouly a full 'check -luks' would take
> 
>   $ time ./check -luks
>   Passed all 22 tests
> 
>   real  23m9.988s
>   user  21m46.223s
>   sys   0m22.841s
> 
> Now it takes
> 
>   $ time ./check -luks
>   Passed all 22 tests
> 
>   real  4m39.235s
>   user  3m29.590s
>   sys   0m24.234s
> 
> Still slow compared to qcow2/raw, but much improved
> none the less.
> 
> Signed-off-by: Daniel P. Berrange <address@hidden>
> ---

Reviewed-by: Eric Blake <address@hidden>

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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