[ns] Is there a data rate limitation for ns emulate?

[jerry zhao]

Hello,
I want to build a scenrio to emulate video streaming.
my real network topology is:

     A- - - - >B<- - - - -C
The NS was installed on Computer B.
The data rate is relative big(more than 30Mb/s). There is always
warnings " RealTimeScheduler:
warning:slop ... exceed limit ...."
And some packets are lost, but the bandwith is enough to transmit the video
data.
Could anyone tell me if there is a data rate limitation for ns emulate? Any
advice would be appreciated.
Thanks.

Jerry