Systems with some types of high performance I/O option cards, such as dual port InfiniBand cards, might experience constrained I/O performance under some types of high stress workloads. The symptom appears as lower than expected bandwidth through the external ports of the I/O option cards.
Workaround
If you see lower than expected performance through the external ports of high bandwidth I/O cards and it is not attributable to an external cause, such as fabric issues, the following procedure might increase I/O performance.
Start or reboot the server.
During the initial boot process, press F2 when prompted to enter the BIOS Setup Utility.
Use the right arrow key to navigate to the Advanced menu.
Cursor down to select CPU Power Management Configuration and press Enter.
Set the power management configurations as follows:
CPU PM Tuning: Manual EIST (GV3): Disabled Turbo Mode: Disabled CPU C3 report: Disabled CPU C6 report: Disabled Package C state Limit: C0/C1 Uncore Frequency Scaling: Disabled
Press the F10 key to save your new settings and exit the BIOS Setup Utility.
For the latest updates on this issue, refer to bug 19526300 in My Oracle Support: