During our testing on OpenSolaris we encountered some issues when the 'tcp_fusion' option was enabled. We found that the kernel could incorrectly buffer large amounts of data, which could cause the machine in question to 'hang'. We recommend that customers using this release of OpenSolaris turn off the 'tcp_fusion' feature to avoid this issue.
To turn off this feature you can immediately turn it off with the following command,
However this will not be persistent across system reboots. If you want 'tcp_fusion' to be permanently disabled you will need to add the following line to '/etc/system'
set ip:do_tcp_fusion = 0
Once you have added this line you will need to reboot the system for the change to take effect.
