Date: Sat, 11 Jun 2011 13:55:15 -0700 From: Doug Barton <dougb@FreeBSD.org> To: Warner Losh <imp@bsdimp.com> Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org, src-committers@FreeBSD.org, Robert Watson <rwatson@FreeBSD.org>, Joel Dahl <joel@FreeBSD.org> Subject: Re: svn commit: r222980 - in head/sys: amd64/conf i386/conf Message-ID: <4DF3D633.5060506@FreeBSD.org> In-Reply-To: <9583277B-6EC0-4B7F-9640-2B128A96C6B8@bsdimp.com> References: <201106110908.p5B98kkE066709@svn.freebsd.org> <alpine.BSF.2.00.1106111403060.44950@fledge.watson.org> <4DF3B12C.8020505@FreeBSD.org> <9583277B-6EC0-4B7F-9640-2B128A96C6B8@bsdimp.com>
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On 6/11/2011 1:02 PM, Warner Losh wrote: > > On Jun 11, 2011, at 12:17 PM, Doug Barton wrote: > >> On 6/11/2011 6:07 AM, Robert Watson wrote: >>> To me, this seems like the wrong direction. Over the last decade, we've >>> been trying to move away from conditional compilation of features to >>> having them be loadable as modules. >> >> FWIW, I agree. I'm wondering though, is there still a performance penalty for modules? My understanding in the past was that there is, although for most use cases it's in the statistical noise. Is that still true? > > At run time, I believe that's true. At load time, lots of modules can take a few seconds longer. I have 3 or 4 modules loaded via loader.conf at boot time. They take at least 2 seconds each. IMO loading everything via loader.conf would slow the boot so much as to be a non-starter. OTOH, I could imagine an rc.d script that depends on mountcritlocal that could load a list of modules. Unless I'm missing something that would be several times faster. Doug -- Nothin' ever doesn't change, but nothin' changes much. -- OK Go Breadth of IT experience, and depth of knowledge in the DNS. Yours for the right price. :) http://SupersetSolutions.com/
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