I have a performance issue here, any input would be greatly appreciated.

TSM Server: 5.3 on AIX 5.3
TSM Client:  5.2.3 on HP-UX B.11.11
TSM Storag Agent 5.2.3 
Tape Library: IBM 3584 LTO2 with 12 drives

The backup throughput is not good.

06/17/05   06:59:51 Total number of objects inspected:  375,305
06/17/05   06:59:51 Total number of bytes transferred:    137.57 GB
06/17/05   06:59:51 Elapsed processing time:           11:16:41
06/18/05   05:15:41 Total number of objects inspected:  375,766
06/18/05   05:15:41 Total number of bytes transferred:    120.24 GB
06/18/05   05:15:41 Elapsed processing time:           09:32:08
06/19/05   06:37:26 Total number of objects inspected:  375,840
06/19/05   06:37:26 Total number of bytes transferred:    142.51 GB
06/19/05   06:37:26 Elapsed processing time:           10:54:18
06/20/05   06:04:59 Total number of objects inspected:  375,881
06/20/05   06:04:59 Total number of bytes transferred:    122.82 GB
06/20/05   06:04:59 Elapsed processing time:           10:21:51
06/21/05   04:58:34 Total number of objects inspected:  376,030
06/21/05   04:58:34 Total number of bytes transferred:    123.83 GB
06/21/05   04:58:34 Elapsed processing time:           09:15:27
06/22/05   06:44:12 Total number of objects inspected:  376,119
06/22/05   06:44:12 Total number of bytes transferred:    138.77 GB
06/22/05   06:44:12 Elapsed processing time:           11:01:06
06/23/05   13:45:24 Total number of objects inspected:  376,478
06/23/05   13:45:24 Total number of bytes transferred:    291.25 GB
06/23/05   13:45:24 Elapsed processing time:           18:02:19


dsm.sys
SErvername  tsm
   COMMmethod         TCPip
   TCPPort            1500
   HTTPport           1581
   WEBPORTS           1582 1583
   TCPServeraddress   10.12.1.20

node sm54

passwordaccess generate
Schedmode prompted

errorlogname /opt/tivoli/tsm/client/ba/bin/dsmerror.log
errorlogretention 30

schedlogname /opt/tivoli/tsm/client/ba/bin/dsmsched.log
schedlogretention 7

resourceutilization 3
tcpwindowsize 128
tcpbuffsize 64
TCPNodelay Yes

largecommbuffers no
compression no

enablelanfree yes
LANFREECommmethod TCPIP
LANFREETCPPort 1500
TxnByteLimit 2097152

Except I found one warning message from dsmerror.log, nothing else:
06/17/05   19:43:32 SetSocketOptions(): Warning. The TCP window size
defined to ADSM is not supported by your system.
It will be to set default size - 65535
06/18/05   19:43:07 SetSocketOptions(): Warning. The TCP window size
defined to ADSM is not supported by your system.
It will be to set default size - 65535
06/19/05   19:43:07 SetSocketOptions(): Warning. The TCP window size
defined to ADSM is not supported by your system.
It will be to set default size - 65535
06/20/05   19:43:06 SetSocketOptions(): Warning. The TCP window size
defined to ADSM is not supported by your system.
It will be to set default size - 65535
06/21/05   19:43:05 SetSocketOptions(): Warning. The TCP window size
defined to ADSM is not supported by your system.
It will be to set default size - 65535
06/22/05   19:43:04 SetSocketOptions(): Warning. The TCP window size
defined to ADSM is not supported by your system.
It will be to set default size - 65535