Date: Sat, 25 Jul 2015 11:52:09 +0300 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: Scott Long <scott4long@yahoo.com> Cc: svn-src-all@freebsd.org Subject: Re: svn commit: r284959 - in head: . share/man/man4 share/man/man9 sys/conf sys/dev/glxsb sys/dev/hifn sys/dev/random sys/dev/rndtest sys/dev/safe sys/dev/syscons sys/dev/ubsec sys/dev/virtio/random sy... Message-ID: <20150725085209.GI43740@zxy.spb.ru> In-Reply-To: <96EA33AB-7325-4DD2-83F4-B4FAF6F47CB5@yahoo.com> References: <201506301700.t5UH0jPq001498@svn.freebsd.org> <alpine.BSF.2.20.1507221138360.1071@desktop> <FFAED695-145A-45F5-988D-B843EF5F544B@FreeBSD.org> <alpine.BSF.2.20.1507221249120.1071@desktop> <FFFB06D7-164B-40B3-AFC3-A6630BCF074E@bsdimp.com> <E20B169F-4C8A-4D11-9853-5C2EFC116450@FreeBSD.org> <F54A96A8-D9AD-409A-814F-538B6AD3CD50@yahoo.com> <20150724012519.GE78154@funkthat.com> <BC734D25-375C-4C1C-BA8A-BD91158B6A39@FreeBSD.org> <96EA33AB-7325-4DD2-83F4-B4FAF6F47CB5@yahoo.com>
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On Fri, Jul 24, 2015 at 11:06:59PM -0600, Scott Long via svn-src-all wrote: > > I'm working on a premise of "tools, not policy". I'd like there to be > > enough harvesting points for the box owner to get the warm fuzzies. > > If they choose to use less, fine by me. > > > > Sure, and that's not an unreasonable goal, but the devil is in the details. > It's an unfortunate fact of modern CPU architecture that even something > as simple and innocent as a run-time control that checks a variable can > cause significant performance problems, thanks to the penalty of cache > misses and bus contention between lots of CPU cores. Maybe these > "extended" collection points should be controlled with a compile-time > option? I am hate compile-time option, may be time to introduction some JIT in project? As global feature.
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