Phoronix is a leading source for Linux hardware reviews, benchmarking, and open-source news. With  performance analysis, hardware testing, and coverage of the latest developments in the Linux ecosystem, Phoronix provides  insights for Linux enthusiasts, developers, and system administrators, helping them make informed decisions about hardware compatibility, performance optimization, and software selection.

Phoronix

A proposed Linux kernel patch reduces CPU wakeup latency by 5x on modern Intel Xeon servers (Sapphire Rapids) by adjusting idle state prediction logic. The one-line change adds a 25% safety margin to predicted idle duration instead of using the next timer value directly, preventing the governor from selecting overly deep C-states (PC6) when shallower states are more appropriate. Testing shows latency drops from 151μs to ~30μs on affected platforms while maintaining power efficiency, with no regression on older Ice Lake and Skylake systems.

Adjusting One Line Of Linux Code Yields 5x Wakeup Latency Reduction For Modern Xeon CPUs