Date: Tue, 19 Jun 2012 06:39:39 +0200 (CEST) From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> To: Doug Barton <dougb@freebsd.org> Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, Richard Yao <ryao@gentoo.org>, Vincent Hoffman <vince@unsane.co.uk>, Nathan Whitehorn <nwhitehorn@freebsd.org>, Outback Dingo <outbackdingo@gmail.com>, openrc@gentoo.org, =?ISO-8859-15?Q?Atte_Peltom=E4ki?= <atte.peltomaki@iki.fi> Subject: Re: Replacing rc(8) (Was: FreeBSD Boot Times) Message-ID: <alpine.BSF.2.00.1206190636100.1823@wojtek.tensor.gdynia.pl> In-Reply-To: <4FDFB166.2040709@FreeBSD.org> References: <20120615124849.GI96212@ass.kameli.org> <CAKYr3zxSOFOUghqao=3U_8sBNHwqce8AGK6mSFd6is11qzjS8w@mail.gmail.com> <20120618081140.GK96212@ass.kameli.org> <4FDF6177.5050608@unsane.co.uk> <4FDF6586.9060501@gentoo.org> <4FDFB166.2040709@FreeBSD.org>
next in thread | previous in thread | raw e-mail | index | archive | help
> replacing rc.d, since that's almost certainly not relevant to the > original topic of improving the overall boot time. indeed. > > If you analyze the boot process thoroughly you should see that out of > the total time taken to boot, nearly 0 is spent by rc.d actually doing > something. Almost all of the actual time is spent waiting for other > stuff, either the kernel (primarily) or the services that the system is > running actually starting up. > most of boot time consist of - delay in bootloader. setting autoboot_delay can partially delay it, delay to zero can be achieved by patching first stage booter that too add delay - delay in kernel initialization. making custom kernel helps of course but still it takes eg 10 seconds on my laptop. putting things that are not needed instantly at boot - as module - may help. USB being prime example. - delay at rc.d scripts - there are some delays inserted. > The latter item is the only place where making changes to rc.d is going > to help, and only then by parellelizing, and even then you are not > really going to gain much since most things at boot time are serial. grep sleep /etc/rc.d/* usr/local/etc/rc.d/* > > So while talk of how to get your favorite boot-time manager into FreeBSD > may be entertaining, it's not likely to be productive, and almost it is unimportant as FreeBSD don't crash.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?alpine.BSF.2.00.1206190636100.1823>