Few Question About SSH

Hi

i have few question about openssh ,
i am running ssh hosting and i have about 300-400 open ssh at a time,

current openssh version is : 4.3p1
current os : centos 4.2 32bit

my questions is :


1-How is working openssh on 64bit ? becouse i see some programs
running faster ( with more memory usage ) and some of them working
with same speed in 32bit and some of them have problems in 64 bit !

i wana know about stability and speed improving.

2-I wana know how can i set SSHD that check username password from
MYSQL server , i tried with pam-mysql and i changed all of pam
settings ! but SSH first checking /usr/passwd and if username
doesnt exist in /usr/passwd it showing user not found and
terminationg and if user exist in /usr/passwd it checking password
from MYSQL !!!

i wana know how can set that ssh check username and password
completly from mysql database.


THANKS !

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