b00affdeb5
With compilers making increasing use of vector instructions the performance benefit of lazily switching FPU state is no longer a desirable tradeoff. Linux switched to eager FPU context switch some time ago, and the idea was floated on the FreeBSD-current mailing list some years ago[1]. Enable eager FPU context switch by default on amd64, with a tunable/sysctl available to turn it back off. [1] https://lists.freebsd.org/pipermail/freebsd-current/2015-March/055198.html Reviewed by: jhb Tested by: pho Sponsored by: The FreeBSD Foundation