Private bug reported:
Silicon robustness refers to the ability of the processor,
interconnects, and supporting silicon components to operate reliably
under varying conditions such as voltage fluctuations, thermal stress,
aging effects, and manufacturing variability. As process nodes shrink
and system complexity increases, susceptibility to transient faults
(soft errors), timing violations, and degradation mechanisms (e.g.,
electromigration, BTI) becomes more prominent.
Modern platforms incorporate multiple silicon-level RAS features such as
parity protection, retry mechanisms, redundancy, error containment, and
telemetry to ensure continued operation in the presence of faults. These
mechanisms span CPU cores, caches, interconnect fabrics, memory
controllers, and I/O subsystems.
In the Linux kernel, silicon robustness features are partially exposed
through Machine Check Architecture (MCA), EDAC, thermal/power
subsystems, and platform firmware interfaces. However, comprehensive
visibility and standardized handling of silicon-level faults and
degradation indicators are limited. Enhancing OS-level support would
improve fault detection, isolation, and recovery, thereby increasing
overall system reliability and uptime.
Feature Request:
Requested details to be enabled on OS:
Enhance Machine Check Architecture (MCA) handling for detailed silicon fault
reporting.
Integrate silicon-level error reporting with EDAC and RAS subsystems.
Provide visibility into parity errors, retry events, and internal fabric
faults.
Expose silicon health telemetry (voltage, thermal margins, aging indicators)
via sysfs/debugfs.
Enable proactive fault management (e.g., core offlining, frequency throttling,
workload migration).
Support firmware-to-OS handoff of silicon reliability metrics and thresholds.
Improve logging and tracing of transient and persistent silicon errors.
Enable correlation of errors across CPU, memory, and I/O subsystems.
Provide tools for diagnostics, validation, and failure analysis.
Document silicon robustness features, error interpretation, and mitigation
strategies.
Business Justification:
Improves overall system reliability and uptime in production environments.
Enables early detection of silicon degradation and impending failures.
Reduces unplanned downtime through proactive fault mitigation.
Supports mission-critical workloads with strict reliability requirements.
Enhances observability for platform validation and support teams.
Aligns OS capabilities with advanced silicon-level RAS features in modern
processor
References:
CPU Vendor RAS Documentation (e.g., AMD, Intel MCA/SMCA guides)
Linux Kernel RAS and EDAC Subsystem Documentation
ACPI Platform Error Interface (APEI) Specification
Industry Whitepapers on Silicon Reliability and Aging Mechanisms
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Information type changed from Public to Private
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https://bugs.launchpad.net/bugs/2146666
Title:
Request for RAS Reliability Support – Silicon Robustness
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