svn commit: r335072 - head/sys/amd64/amd64

[Oliver Pinter]

On Thursday, June 14, 2018, Rodney W. Grimes <freebsd at pdx.rh.cn85.dnsmgr.net>
wrote:

> > Author: kib
> > Date: Wed Jun 13 17:55:09 2018
> > New Revision: 335072
> > URL: https://svnweb.freebsd.org/changeset/base/335072
> >
> > Log:
> >   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
>
> MFC: ?


Already done.


>
> ...
>
> --
> Rod Grimes
> rgrimes at freebsd.org
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