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U may refer these articles for tcp/ip stack/window size
this is just a guess, but the T1000 and T2000 are really slow when doing single-thread cpu stuff. When you do scp, a single thread or process on each machine has to do all the encryption and this is most likely what is slowing you down. To analyze this further, look at the output of prstat (or top). If I am right, you will see one scp/ssh process using all cpu time of one of your cores/threads. In a T2000 with 8 cores, 32threads, this will be shown in prstat as 6.7% utilization.
Thats one of the things I've checked to ensure that CPU wasnt causing a bottleneck it and sadly was not the case, thanks for your suggestion though.
After opening a case with Oracle this was narrowed down to the patch level of the solaris hosts. In the current version of solaris the SCP/SSH isnt being offloading to the on-chip crypto that the T2000 server has causing the copy to be VERY slow. If I use FTP or SCP with a different cipher, arcfour, the copies are MUCH faster.