sctp cmt problem：using two wireless cards the speed is lower than using one wireless cards

[jyl_2006]

Before testing cmt in wlan,we also turn on sysctl states by setting 
sysctl net.inet.sctp.cmt_pf=1 
sysctl net.inet.sctp.cmt_use_dac=1 
sysctl net.inet.sctp.cmt_on_off=1 

My Os is Freebsd8.2, I write a simple tarball  to send data ,  and get data
from wireshark .
The result shows that both two path have data , but the time of two path is
much higher than one path.

Can anyone point out something we did wrong or steps we missed? 
Thanks in advance.
 

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