Use it in preference of Xfenced RDTSC if RDTSCP is supported. It is recommended by both Intel and AMD. But, on AMD Zens and newer use LFENCE, as recommended by AMD [*]. In particular, this means that now AMD CPUs use more appropriate fence instead of too harsh MFENCe. Add comment explaining the intent of the selection logic. Reported by: gallatin [*] Reviewed by: gallatin, markj Tested by: gallatin, pho MFC after: 1 week Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D27986 |
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acpica | ||
bios | ||
conf | ||
cpufreq | ||
include | ||
iommu | ||
isa | ||
linux | ||
pci | ||
x86 | ||
xen |