Actually CIFS and SMB (SAMBA) are slower then NFS or FTP for file protocols, so this would almost be ok for a 100MB NIC, best would be 12MB /s. For iSCSI this is slow - could mean something on the initiators end or the host system. Allot can cause poor performance, slow drives, CPU, RAM, switch.... please experiment as you should be higher higher then this by 4x. Try another system with 1GB NIC's on both.