Networking changes between Solaris 10 x86 10/08 (u6) and previous versions?

Solaris Community:
We have a J2SE CORBA-based application (that uses the default Sun ORB) that has run without problems on Solaris 8, 9, and 10 on both SPARC and, more recently, X86 platforms. Upgrading our client side machine (X4100 M2 Opteron platform) from Solaris 10 x86 5/08 (u5) to Solaris 10 x86 10/08 (u6) has resulted in threading or socket contention issues that we have not experienced previously. Using Live Upgrade, we can quickly go back to the u5 install on the client machine .... and the problems go away .... going back to u6, however, and the problems begin to show almost immediately. Our Java code base is identical as is the version of the JDK (1.5.0_16), so it would appear that there must be an underlying change to socket, networking, or threading behavior between these two versions of Solaris.
Thus far, I've not been unable to find details of changes either in the networking support or the threading model that might explain this .... or course, I don't have great expertise in these areas.
I've tried to use 'ndd /dev/tcp SOME_PARAMETER' for all of the /dev/tcp parameters returned by 'ndd /dev/tcp \?' to try to see if there are underlying changes in the /dev/tcp parameters .... but have not found any differences between Solaris 10 u5 and u6.
Can anyone point me to resources that would discuss changes between Solaris 10 u5 or u6 that might explain the problems that we've encountered? Or, alternatively, other system parameters that I could check that might explain changes in either TCP socket or threading behavior?
Thanks for your input,
John

I have a vague memory of someone reporting something similar which turned out to be due to a solaris feature called tcp_fusion.
To check whether thats your problem or not try the following.
Add following line in the /etc/system file.
set ip:do_tcp_fusion = 0
Once the /etc/system file is updated, it will be necessary to restart the system before the workaround will take effect.

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<table border="0" align="center" width="90%" cellpadding="3" cellspacing="1"><tr><td class="SmallText"><b>Joovilhar wrote on Wed, 08 March 2006 02:14</b></td></tr><tr><td class="quote">
I can't seem to get the driver to bind to the proper address (pci8086,1019 - from what I have been able to find out): It instead insists on binding to pci1043,80f7. Even though pci8086,1019 is listed in /etc/device_aliases, it won't play nice.
</td></tr></table>
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<table border="0" align="center" width="90%" cellpadding="3" cellspacing="1"><tr><td class="SmallText"><b>Quote:</b></td></tr><tr><td class="quote">
I know the NIC is working, and have tried it under other OSes (including Linux).
Although Solaris x86 "sees" something there, and the interface is plumbed (it can even tell when the network link is up or down), I can't get the interface to work - pings do not work, etc.
</td></tr></table>
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