Date: Thu, 14 Jun 2018 07:59:47 +0200 From: Oliver Pinter <oliver.pinter@hardenedbsd.org> To: "rgrimes@freebsd.org" <rgrimes@freebsd.org> Cc: Konstantin Belousov <kib@freebsd.org>, "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, "src-committers@freebsd.org" <src-committers@freebsd.org> Subject: Re: svn commit: r335072 - head/sys/amd64/amd64 Message-ID: <CAPQ4ffvS8B3TOYmUbWuXSYepeOCXNg%2BJR=%2B3M3jdK424noc1HA@mail.gmail.com> In-Reply-To: <201806140030.w5E0UTIi042096@pdx.rh.CN85.dnsmgr.net> References: <201806131755.w5DHtAwo073314@repo.freebsd.org> <201806140030.w5E0UTIi042096@pdx.rh.CN85.dnsmgr.net>
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On Thursday, June 14, 2018, Rodney W. Grimes <freebsd@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@freebsd.org > _______________________________________________ > svn-src-head@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/svn-src-head > To unsubscribe, send any mail to "svn-src-head-unsubscribe@freebsd.org" >
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