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Linux 6.19's NEXT_BUDDY scheduler feature is being disabled due to performance regressions in MySQL, SPECjbb, and DayTrader workloads. The feature was re-implemented for EEVDF during the 6.19 merge window, but testing revealed measurable performance drops including Nginx HTTPS server regressions. A patch has been queued to disable NEXT_BUDDY by default until the root causes are addressed, though this may negatively impact workloads that benefited from the feature.

Linux 6.19 Scheduler Feature Being Disabled Due To Performance Regressions