Date: Wed, 13 Jun 2012 09:19:47 -0500 From: Nathan Whitehorn <nwhitehorn@freebsd.org> To: freebsd-hackers@freebsd.org Subject: Re: FreeBSD Boot Times Message-ID: <4FD8A183.2020809@freebsd.org> In-Reply-To: <4FD7CA24.6080405@gentoo.org> References: <4FD66F7E.2060404@brandonfa.lk> <71dc991c8d1b4d2c91ff942fc5f8f340@HUBCAS2.cs.stonybrook.edu> <4FD7CA24.6080405@gentoo.org>
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On 06/12/12 18:00, Richard Yao wrote: > On 06/11/12 18:51, Garrett Cooper wrote: >> On Mon, Jun 11, 2012 at 3:21 PM, Brandon Falk<bfalk_bsd@brandonfa.lk> wrote: >>> Greetings, >>> >>> I was just wondering what it is that FreeBSD does that makes it take so long >>> to boot. Booting into Ubuntu minimal or my own custom Linux distro, >>> literally takes 0.5-2 seconds to boot up to shell, where FreeBSD takes about >>> 10-20 seconds. I'm not sure if anything could be parallelized in the boot >>> process, but Linux somehow manages to do it. The Ubuntu install I do pretty >>> much consists of a shell and developers tools, but it still has a generic >>> kernel. There must be some sort of polling done in the FreeBSD boot process >>> that could be parallelized or eliminated. >>> >>> Anyone have any suggestions? >>> >>> Note: This isn't really an issue, moreso a curiosity. >> The single process nature of rc is a big part of the problem, as >> is the single AP bootup of FreeBSD right before multiuser mode. There >> are a number of threads that discuss this (look for parallel rc bootup >> or something like that in the current, hacker, and rc archives -- the >> most recent discussion was probably 6~9 months ago). >> Given past experience, a big part of getting past the parallelized >> rc mess would be to make services fail/wait gracefully for all their >> resources to come up before proceeding. It's not easy, but it's >> possible with enough resources. >> HTH, >> -Garrett >> _______________________________________________ >> freebsd-hackers@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-hackers >> To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" > Gentoo FreeBSD shares OpenRC with Gentoo Linux. OpenRC is a BSD 2-clause > licensed System V init system replacement that supports parallel boot. > Its boot performance is competitive with systemd and Ubuntu's upstart. > > If FreeBSD's init system is serializing the boot process, it might be > worthwhile to consider importing OpenRC. > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" Please don't change any of the user-facing aspects of the RC system. One of the things that brought me (and many others I know) to FreeBSD, besides working sound, was having an rc.conf that was easy to configure instead of the nightmare that is System V init. -Nathan
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