Date: Sat, 25 Jul 2015 10:05:54 -0600 From: Scott Long <scott4long@yahoo.com> To: Mark R V Murray <markm@FreeBSD.org> Cc: src-committers <src-committers@freebsd.org>, svn-src-all@freebsd.org, svn-src-head@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: <109674C8-0584-4347-9DBE-0401B9BDC514@yahoo.com> In-Reply-To: <C7829D02-EFB2-4C3D-B68E-28A6CADCEC01@FreeBSD.org> 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> <C7829D02-EFB2-4C3D-B68E-28A6CADCEC01@FreeBSD.org>
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> On Jul 25, 2015, at 2:10 AM, Mark R V Murray <markm@FreeBSD.org> wrote: > > >> On 25 Jul 2015, at 06:06, Scott Long <scott4long@yahoo.com> 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. > > Yes, indeed! > >> 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? > > They can. I’ve coded it already, but not tested it properly, and will > commit in a week or two. :-) What you posted this morning for review is a great start. Thanks for the productive conversation on this. Scott
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