Date: Wed, 13 Jun 2018 17:30:29 -0700 (PDT) From: "Rodney W. Grimes" <freebsd@pdx.rh.CN85.dnsmgr.net> To: Konstantin Belousov <kib@freebsd.org> Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r335072 - head/sys/amd64/amd64 Message-ID: <201806140030.w5E0UTIi042096@pdx.rh.CN85.dnsmgr.net> In-Reply-To: <201806131755.w5DHtAwo073314@repo.freebsd.org>
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> 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: ? ... -- Rod Grimes rgrimes@freebsd.org
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