Old PADATA patch vs crypto-2.6 tree

Hey,

How activate the IPsec parallelization ?
I compiled the crypto-2.6 kernel with this param :
CONFIG_CRYPTO_... = y
CONFIG_PADATA = y
CONFIG_SMP=y
After installation on 2 servers (IPSEC tunnel), i don't detect the IPsec
parallelization.
The algorithm is loaded (present in /proc/crypto), but only one core works.

So, What are the other parameters that I forgot for the compilation of the
kernel? IRQ, IO, Scheduler parameters... Am i missing something ?
I thought that the parallelization was automatically started. True ?
What are the conditions to observe a parallel work ?
A "little" documentation will be Welcome.

I'd like compare the bandwidth of my test platform using the « old » PADATA
patch.

Sebastien