![]() Capabilities range from optimized support for large CPU counts and memory configurations to the ability to handle an increased number of system-interconnect buses and peripherals. A primary feature of Red Hat Enterprise Linux 6 is that it is designed to provide the scalability to handle systems well into the future. These systems and their successors are approaching the scalability limits of Red Hat Enterprise Linux 5. For example it is now possible to have 64 CPUs and 2TB of memory in a 5U rackmount form factor. Recent hardware launches have resulted in significant growth in commodity computing platforms. These foundational changes impact a number of kernel subsystems. For example, elimination of unnecessary locking occurrences, replacement of many spin locks with sleep locks and implementation of more efficient locking primitives. ![]() Additionally, there are a substantial range of multi-processor lock synchronization enhancements. This includes a complete rewrite of the process scheduler so that it more fairly shares compute cycles among processes and provides more determinism by enabling higher-priority processes to run with minimal interference from lower-priority processes. Red Hat engineers have played key roles in the upstream development of a wide range of kernel performance enhancements that we plan to feature in Red Hat Enterprise Linux 6. New tuning tools like “tuned,” which is an adaptive system tuning daemon, allow the system to adjust power consumption based on analysis of service usage patterns. New monitoring tools like powertop are designed to help pin-point power consumption issues that can be resolved in order to further reduce power consumption. This leads to cooler CPUs and greater power savings compared to previous releases. Time-keeping improvements within the kernel allow the system to transition processors that do not have active tasks into the idle state more frequently.
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