I have two link between to locations each of 16MB.
See teh topology

                           1.1.1.1/8            1.1.1.2/8
                           Gig0/1               Gig0/1
HostA-------------|ROUTER1|--------------------------| ROuter2|------------HOstB
                  |       |  Gig0/0           Gig0/0 |        |
172.16.1.1        |7206   |--------------------------| 7206   |          172.16.2.2  
                           2.2.2.1/8        2.2.2.2/8


I have two link between to locations  each of 16MB..

We are using SDM link between to router.

COnfig on router 1
====================

ip cef

inte gig0/1
ip ADDRESS 1.1.1.1 25.0.0.0
ip load shareing per-packet
no ip proxy-arp
no ip mroute-cache
no autonegotiation 
load-interval 30
dulpex full
speed 100
media type RJ45



inte gig0/0
ip ADDRESS 2.2.2.1 25.0.0.0
ip load shareing per-packet
no ip proxy-arp
no ip mroute-cache
no autonegotiation 
load-interval 30
dulpex full
speed 100
media type RJ45


ip route 172.16.2.0 255.255.255.0 1.1.1.2

ip route 172.16.2.0 255.255.255.0 2.2.2.2


===================
COnfig on router2
===================

ip cef

inte gig0/1
ip ADDRESS 1.1.1.2 25.0.0.0
ip load shareing per-packet
no ip proxy-arp
no ip mroute-cache
no autonegotiation 
load-interval 30
dulpex full
speed 100
media type RJ45



inte gig0/0
ip ADDRESS 2.2.2.2 25.0.0.0
ip load shareing per-packet
no ip proxy-arp
no ip mroute-cache
no autonegotiation 
load-interval 30
dulpex full
speed 100
media type RJ45


ip route 172.16.1.0 255.255.255.0 1.1.1.1

ip route 172.16.1.0 255.255.255.0 2.2.2.1


Now with this config...

When i m doing FTP(20 MB) from host A to Host B then i geting very low threwput on both link....i m geting aound 20% 
therwput.

If i remove one link then i m geting 100% thoughput on the remained link.

PLease let me know where is root cause of problem ?If u are haveing any alternate solutions for same (to load balance )let me know.