The Oracle Solaris OS might run out of MSI interrupts on eight-socket systems.
Due to a limitation in the number of interrupts that can be assigned in Oracle Solaris 10 9/10, there is a maximum of two MSI-X interrupts available per device function. This might result in lowered performance for some devices.
Workaround
Install patch 144489-11 or higher as described in Patch 144489–11 or Later Is Required on the Oracle Solaris 10 OS.
This fixes the problem in most cases.