A Bug for 100Mb interface?

[gdy1039]

test env:win7+vmware7+pfsense2.0.2+winxp

–[adsl router] –----192.168.2.152 (100Mb)[win7]
                       |
                       |
                       –-192.168.2.154(wan 1000Mb))pfsense(vmware)10.0.0.253 –- 10.0.0.1(1000Mb)[winxp(vmware)]

case1:
wan:bandwidth 102400Kb,Scheduler CBQ
qlow: default queue,bandwidth 20%,allow borrow,
qothers:bandwidth 80%,allow borrow

lan:bandwidth 102400kb,Scheduler CBQ
qlow:default queue,bandwidth 20%,allow borrow,
qothers:bandwidth 80%,allow borrow

test1:from win7 copy file to winxp
lan(qlow 48.9Mb/s)  and wan(qlow 1.45Mb/s)

test2:from winxp copy file to win7
lan(qlow 1.69Mb/s) and wan(qlow 71Mb/s)

+++++++++++++++++++++++++++++++++++++++++
case2:
wan:bandwidth 10240Kb,Scheduler CBQ
qlow: default queue,bandwidth 20%,allow borrow,
qothers:bandwidth 80%,allow borrow

lan:bandwidth 10240kb,Scheduler CBQ
qlow:default queue,bandwidth 20%,allow borrow,
qothers:bandwidth 80%,allow borrow

test1:from win7 copy file to winxp
lan(qlow 9.49Mb/s)  and wan(qlow 207Kb/s)

test2:from winxp copy file to win7
lan(qlow 208Kb/s) and wan(qlow 9.49Mb/s)

++++++++++++++++++++++++++++++++++++++++

in case1,it can't be full spped for 100Mb,why?
if I make winxp direct connect to win7,it can be full speed
of both wan and lan not set bandwidth, it can be full speed.

please