From owner-freebsd-current@FreeBSD.ORG  Sat Feb 28 20:32:39 2004
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Date: Sat, 28 Feb 2004 18:32:07 -1000 (HST)
From: Vincent Poy <vince@oahu.WURLDLINK.NET>
To: Andre Guibert de Bruet <andy@siliconlandmark.com>
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cc: current@freebsd.org
Subject: Re: buildworld times
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On Sat, 28 Feb 2004, Andre Guibert de Bruet wrote:

> On Sat, 28 Feb 2004, Vincent Poy wrote:
>
> > On Sat, 28 Feb 2004, Robert Watson wrote:
> > > As you point out, debugging problems is a lot easier if you run with
> > > INVARIANTS+WITNESS.  However, you may well see build times halve or more
> > > by running without WITNESS.
> >
> > 	I always thought INVARIANTS caused slow performance as well.
> > Ofcourse, it does seem all the stuff mentioned above is disabled in a
> > -RELEASE GENERIC kernel so that may be it as well.
>
> GENERIC's got enough stuff in it that you will notice a good difference in
> the disk footprint of the image as well as the memory image of the kernel
> when run. I tend to take GENERIC, strip out all of the statically compiled
> drivers that I don't need and add whatever options I need on the machine.
> From my own tests, something as simple as "options ADAPTIVE_MUTEXES" can
> yield upwards of 5% compile time reduction. This number is even higher on
> multi-CPU machines.

	That's what I usually do is disable the stuff I don't need but
with -current, it seems like you need the debugging for kernel panics as a
necessary precaution.


Cheers,
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