Help!  Poor network (LAN) performance with T2000, Solaris 10, GB

Hi-
I'm having a problem that I'm hoping someone can help me with.
We've recently purchased a few of the T2000 boxes, with the ipge (GB) cards in them.
The problem we're having is that we can't seem to get more than 500 mbit/s performance out of them, at least the way we're measuring them.
So, I have 2 questions... (a) how can we validate that we are in fact getting GB performance for file downloads, etc. and (b) is there something that we have to do in order to accomplish this if our readings are correct?
Background:
What we've done so far is as follows:
Validate that the connection is indeed GB, full duplex.
root@conn1 # dladm show-dev
ipge0 link: unknown speed: 1000 Mbps duplex: full
ipge1 link: unknown speed: 0 Mbps duplex: unknown
ipge2 link: unknown speed: 0 Mbps duplex: unknown
ipge3 link: unknown speed: 0 Mbps duplex: unknown
root@conn1 #
We've run a crossover cable between 2 of them to eliminate any "switch" issues from the equation.
We then ran iperf, as a server on one of them, as a client on the other.
Server Output:
root@conn2 # iperf -s
Server listening on TCP port 5001
TCP window size: 48.0 KByte (default)
[  4] local 192.168.1.215 port 5001 connected with 192.168.1.71 port 32795
[ ID] Interval Transfer Bandwidth
[  4] 0.0-10.0 sec 598 MBytes 502 Mbits/sec
Client output:
root@conn1 # iperf -c 192.168.1.215 -i 1
Client connecting to 192.168.1.215, TCP port 5001
TCP window size: 48.0 KByte (default)
[  3] local 192.168.1.71 port 32795 connected with 192.168.1.215 port 5001
[ ID] Interval Transfer Bandwidth
[  3] 0.0- 1.0 sec 57.8 MBytes 485 Mbits/sec
[  3] 1.0- 2.0 sec 59.9 MBytes 502 Mbits/sec
[  3] 2.0- 3.0 sec 60.1 MBytes 504 Mbits/sec
[  3] 3.0- 4.0 sec 59.7 MBytes 501 Mbits/sec
[  3] 4.0- 5.0 sec 59.9 MBytes 502 Mbits/sec
[  3] 5.0- 6.0 sec 60.7 MBytes 509 Mbits/sec
[  3] 6.0- 7.0 sec 60.2 MBytes 505 Mbits/sec
[  3] 7.0- 8.0 sec 59.9 MBytes 503 Mbits/sec
[  3] 8.0- 9.0 sec 59.9 MBytes 503 Mbits/sec
[  3] 9.0-10.0 sec 59.5 MBytes 499 Mbits/sec
[  3] 0.0-10.0 sec 598 MBytes 501 Mbits/sec
root@conn1 #
Thoughts? Help!?
...jeff

Hi,
We are having issues with our T2000s as well. Same setup. t2000s back to back with a crossover connection. Best we are getting with a single iperf test is..
# iperf -c 192.168.1.2 -i 1
Client connecting to 192.168.1.2, TCP port 5001
TCP window size: 2.00 MByte (default)
[  3] local 192.168.1.1 port 52643 connected with 192.168.1.2 port 5001
[ ID] Interval Transfer Bandwidth
[  3] 0.0- 1.0 sec 27.7 MBytes 232 Mbits/sec
[  3] 1.0- 2.0 sec 28.8 MBytes 242 Mbits/sec
[  3] 2.0- 3.0 sec 30.3 MBytes 254 Mbits/sec
[  3] 3.0- 4.0 sec 26.5 MBytes 222 Mbits/sec
[  3] 4.0- 5.0 sec 24.3 MBytes 204 Mbits/sec
[  3] 5.0- 6.0 sec 28.9 MBytes 242 Mbits/sec
[  3] 6.0- 7.0 sec 28.7 MBytes 241 Mbits/sec
[  3] 7.0- 8.0 sec 30.6 MBytes 257 Mbits/sec
[  3] 8.0- 9.0 sec 30.8 MBytes 259 Mbits/sec
[  3] 9.0-10.0 sec 26.8 MBytes 225 Mbits/sec
[  3] 0.0-10.0 sec 283 MBytes 237 Mbits/sec
[  4] local 192.168.1.2 port 5001 connected with 192.168.1.1 port 52643
[ ID] Interval Transfer Bandwidth
[  4] 0.0-10.0 sec 283 MBytes 238 Mbits/sec
Did you ever get an answer to your questions below? Would you be willing to share what you found?
What settings do you have to get the 500 Mbits/sec? Our servers are fairly well loaded so we think it's just fighting for CPU with everything else. If you run many streams your performance improves a great deal. We've gotten ~800Mbits/sec running 5 or more iperf runs at the same time.
If you run "intrstat" while you do the single or many iperf runs what does your CPU peg out at? We get about %11 cpu useage from a single iperf run and %35 from 2 CPUs when we do many iperf runs at the same time.
Thanks,
-Matt

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