Intel has submitted a new Linux driver called 'BFF' (Bitfix Filter) to the kernel mailing list, designed to clear hardware error-reporting filters that can become clogged on aging silicon as bits get stuck over time. The driver is aimed at upcoming Xeon 7 Diamond Rapids processors, whose bitfix filter hardware doesn't exist in any current Intel chip. It missed the Linux v7.3 merge window but could land in v7.4, well ahead of Diamond Rapids' 2027 launch.
Questions this post answers
What does Intel's new BFF Linux driver do?
The BFF (Bitfix Filter) driver clears a hardware filter on certain Intel CPUs that suppresses repeated reporting of the same corrected errors caused by aging silicon developing stuck bits. When the filter fills up, shown by a yellow signature in a machine check bank, the driver clears it to make room for reporting additional hard errors and logs a timestamp, warning if the filter overflows within ten minutes. Kernel engineers tracking hardware reliability drivers can follow rollout details for features like this on daily.dev.
Which Intel processors support the BFF bitfix filter hardware?
The bitfix filter hardware isn't present in any existing Intel processor; it is initially targeted at the upcoming Xeon 7 Diamond Rapids processors, which are expected to launch later in 2027. The driver was submitted to the Linux kernel mailing list too late for the v7.3 merge window but could be included in v7.4. Developers planning for next-gen Xeon support can track kernel driver timelines like this on daily.dev.