kib b00affdeb5 Enable eager FPU context switch by default on amd64.
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
2018-06-13 17:55:09 +00:00
..
2018-03-20 17:58:51 +00:00
2018-03-20 17:58:51 +00:00
2018-06-13 07:02:58 +00:00