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Red Hat Enterprise MRG

MRG Realtime

For the most time-critical workloads, "close enough" isn't good enough. For instance, in the highly competitive financial services marketplace, milliseconds make the difference between a trade and a lost customer. In these environments, consistently fast response times are a huge competitive advantage. MRG Realtime provides the highest levels of predictability for consistent low-latency response times to meet the needs of time sensitive workloads. For most customers, a properly tuned standard Red Hat Enterprise Linux system provides acceptable levels of determinism. For applications with extremely demanding latency requirements, MRG Realtime provides new levels of determinism by optimizing lengthy kernel codepaths to ensure that they do not become bottlenecks, and allowing better prioritization of applications. This results in consistent, predictable response times for high priority applications.

MRG Realtime is a set of RPM packages which are add-ons or replacements to standard Red Hat Enterprise Linux 5 components. To install MRG Realtime, you must have already installed Red Hat Enterprise Linux 5.1 or later. MRG Realtime consists of:

  • A realtime kernel, which replaces the Red Hat Enterprise Linux 5 kernel.
  • A set of configuration utilities designed to allow realtime tuning.
  • A set of performance monitoring tools to allow realtime performance to be monitored and provide information to support realtime tuning.
  • Documentation, including information on how to tune a system for optimal latency.

The realtime capabilities are contained entirely in the realtime kernel, which is currently based on the Linux 2.6.24.7 kernel. The runtime environment, system utilities, and glibc runtime library are completely unchanged, and all applications continue to run. There is no need to recompile applications to run them with MRG Realtime; they are completely compatible with Red Hat Enterprise Linux 5.

Red Hat is committed to ensuring that MRG Realtime will remain compatible with future kernel revisions. Updates and fixes are supported using the same maintenance stream as standard Red Hat Enterprise Linux 5.