Rsync, what are the max transfer limitations ?

[Giorgos Gourgiotis]

What is the maximum transfer rate allowed for rsync? I mean the limitations?
I can't get more than 50Mbit speed in my gigabit lan, with rsync
server or with ssh.  ftp transfers reach >400Mbit , so it is not a lan
or nic problem.
Maybe it has something to do with my cpu limitations? or the
limitations for rsync is the 50Mb/s?
Here is my rsyncd.conf if it helps


> # by gourgi
>  max connections = 100
>  log file = /var/log/rsync.log
>  timeout = 300
>  [disks]
>       comment = rsync disks
>       path = /disks
>       read only = no
>       list = yes
>       uid = nobody
>       gid = nogroup
>       #auth users = gourgi
>       list = yes
>       #hosts allow = 127.0.0.0/8 192.168.0.0/24
>       #secrets file = /etc/rsyncd.secrets

and here is how i  sync
>  rsync -avz rsync://192.168.0.X/disks/4backup /disks/mybackup
or
>

here is rsync version on both systems
>  Version: 2.6.9-6ubuntu2