https://docs.oracle.com/cd/E28853_01/html/E28858/z40037721569612.html
CPU Power Management Can Lower Disk IOPS Performance (16355418) - SPARC T5-2 Server Product Notes
This issue has been fixed in Oracle Solaris 11.1 SRU 10. I/O intensive workloads that attempt to perform very large numbers of I/O operations in a short period...