On 6/13/2012 10:19 AM, Nathan Whitehorn wrote:
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_...@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
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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.
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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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Sorry guys, I was very busy last night.
The issue is not the init system, rather the kernel. Maybe for a server
does the init system start to get lengthy, but at least on my desktop
environment where I have almost nothing for RC to do, the kernel bootup
takes about 95% of the boot process.
If I were to really delve into this (as it would require extensive
changes in the kernel [I think]), I would probably end up branching
FreeBSD either to a new OS, or if I got permission, to just another
branch of FreeBSD.
-Brandon
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